FUEL OIL SYSTEM. www.powerpointpresentationon.blogspot.com. Light diesel oil (LDO) High speed diesel oil (HSD) Heavy Furnace oil (HFO) Low sulphur heavy stock (LSHS). Types Of Fuel Oil. LDO & HSD normally used in Auxiliary boiler Ignitor for certain boiler design.
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FUEL OIL SYSTEM
Light diesel oil (LDO)
High speed diesel oil (HSD)
Heavy Furnace oil (HFO)
Low sulphur heavy stock (LSHS)
LDO & HSD normally used in
Ignitor for certain boiler design.
HFO generally used for power boiler
Heavy Fuel oil (HFO) specification:
Flash Point:The Flash point of a volatile liquid is the lowest
Temperature at which it can vaporize to form a ignitable mixture
1.Heavy Fuel Oil(HFO)
2.LSHS(Light sulphur Heavy stock)
3.HSD(High speed diesel)
Oil firing is preceded by:
1.Lowering viscosity and increasing flowability on heating for better combustion
2.Droplet formation on atomization
3.Combustion initiation by High energy spark ignition.
FUEL OIL SYSTEM:
FUEL OIL SYSTEM CONSISTS OF:
Heavy oil is received at the site in railway tankers of 20 tonne capacity each
An unloading header with number of receiving points for number of wagons unloading is provided.
The connections between loading header and tankers are through rubber flexible hosepipes.
Railway tankers are equipped with steam heating coils.
The Fuel oil is supplied by railway wagons. The installation has been
Provided for unloading 76 wagons simultaneously.For this purpose one
Number unloading header of size 400 NB have been laid between two
Railway tracks with 84 nos. 80 NB branches with plug valves which
Surve as unloading points.400 NB branch is taken from the unloading
Header to the pump house which surves as the suction header for 5 nos.
Unloading cum transfer pump.4 nos. pumps is used for unloading and
I number as stand by.Each pump is 100 cm3 per hour capacity.
At suction side of each pump simplex busket type strainer with 40 mesh
Straining element is provided to make the oil free from foreign particles
Which may cause damage to pump rotor.
For storing the unloaded oils 3 nos. vertical cylinder,fixed roof vented
Type storage tank of nominal capacity 2826 cum has been stalled.
2. TRANSFER SYSTEM:
Oil from any of the 3 storage tanks can be transferred to the pressurising
Pump house by gravity through 200 NB transfer header.It is also possibl
To transfer oil from one storage tank to another , and for this purpose
200 Nb branch connection is taken from each section of transfer line of
Each storage tank and a 350 NB common recirculation line is installed.
Oil through this recirculation line would flow to suction header of un-
Loading pumps and through the pump oil can be taken to any desired
Storage tank by opening the desired inlet vv of storage tank.
DRAIN OIL SYSTEM:
In order to empty storage tank and or any branches, 80 NB and 25 NB ,Branch connection is taken from all lowest points and through a common Header of 80 NB connected to Drain oil tank of capacity 5 cum is Installed at lowest level of unloading pump house.Oil from drain oil Tank to storage tank is to be transferred by 4 cum/hr capacity ,Screw pump named Drain Pump thorugh 50 NB Drain Oil return header.
Drain Oil p/p
4. AUX STEAM & CONDENSATE SYSTEM:
through 200 NB steam header.Steam is being received at a pressure
of 16 kG/cm2 and 212 deg c.
through 150 NB branch connection to supply steam to floor coil
heater and suction heater.
to reduce the pressure of steam from 16 kg/cm2 to 4 kg/cm2.
station.For this purpose 42x2 nos steam trap stations have been
installed along the railway tracks and 2 nos 100 Nb condensate header
is provided along the oil unloading header.
5. ELECTRICAL TAPE TRACING SYSTEM:
To maintain the temp. of oil in the piping and equipment at desired oil
Temperature,Electrical tracing tape is used.The tape used is constant
Wattage type series resistance type of tape.
The Oil temp. to be maintained is 65 deg c for HFO.
6. INSTRUMENTATION & CONTROL SYSTEM:
Following instruments & controls have been provided :
Differntial Pressure gauge
Steam to Atmosphere
Water to Sump Pit
Temperature control of oil through Floor coil heater:
For controlling Temp oil in storage tank through floor coil control
Valve (AS-CV_40-1,2,3) have been provided.Temperature in storage
Tank is sensed through temperature switch(TS-4,5,6),which open or
Close the solenoid valve as per predetermined temperature.(65 degc) set
In temperature switch.When temp falls below 65 degc,solenoid vv open
And instrument air from the instrument header flows through the
Solenoid vv to actuators of control vv to close the vv.
When temperature increases beyond 65 deg c ,solenoid vv is
Closed and control vv is closed by springs of the actuators.
Temperature control of oil through suction Heaters:
Temperature of oil in the suction heater is controlled by controlling the
Quantity of steam through the u tubes in suction heaters.For this purpose
Control vv with pneumati actuator is provided.Depending upon the
Temp. in the outflow branch of suction heater wrt to predetermined temp
(85 deg c),which is to be maintained,controller output air signal and Accordingly actuator opens or close the control v/v to the event required continously.
7. OIL WATER SEPARATOR SYSTEM:
Ef oil Gun
Cd oil gun
Ab oil gun
From pressurising pump house
To storage tank
Short recircultation line
Long recirculation line
Normal check up:
1.Fuel oil tank level is adequate. 2.6 m
2.suction tank temp adequate. (50-80 deg c.)
3.Heating steam is available.
4.Pump & heater is properly line up.
5.Re circulation line is line up.
Routine check up:
1.Tank level (between 2.6 m to 85.m)
2.Tank temp(50-80 deg c)
3.Pump suction strainer DP(less than 1 ksc)
4.pump discharge pr(18-20 ksc)
5.Pump current (30-35 amps)
6.Heater outlet temp(120-130 deg c)