Bi fuel present
-
Upload
mnabel1984 -
Category
Engineering
-
view
122 -
download
2
description
Transcript of Bi fuel present
APPLYING BI FUEL SYSTEM TO FARAS POWER STATION DIESL GENERATOR
AGIBA PETROLEUM CO.By : Mohamed Gomaa, Mohamed Fathy, Yaser Ibrahim
Contents
Introduction
Technical overview
Bi-Fuel System Description
Active Knock Prevention
Conclusion and advantages of Bi-fuel system
Applying BI-FUEL SystemTo Faras Power Station Diesel Generators
QATTARA DEP.
CAIRO
MELEIHA
AGHAR
EL HAMRA
W E S T E R
N D
E S E R T
ALEX.
MATRUH
BED-3
FARAS FIELD LOCATION
0 50 km.
122.5 Km.
55 Km
.
LEGEND
BED-2
RAML & RAML SW
30
31
27 28 29 30
ZARIF
OIL
KHALDA
M E D I T E R R A N E A N S E A
82.5 Km
.
105 Km
.
100 Km
.FARAS
FARAS
Faras field is located in Ras Qattara depression W. Desert, Egypt.
Faras field current daily oil production is about 8300 BOPD (as
March., 2008).
The electrical power station feeding field process facilities, shipping
pumping station and accommodation camp consists of two diesel
generators (type cat 3512), each is 1MVA output rating power.
One generator is running and the other is stand by.
Faras is an area difficult to be reached due to the nature of this area.
transportation to/from site is difficult due to roads bad situation.
FARAS FIELD
Applying BI-FUEL System To Faras Power Station Diesel Generators
HOW TO SAVE DIESEL FUEL CONSUMPTION COST ?
HOW TO OVERCOME THE DIFFIECULTIES OF DIESEL FUEL
ARRIVAL TO THIS HARD AREA “FARAS” ?
REDUCE THE EXHAUST EMMISION AS PER AGIBA HSE POLICY.
OUR TARGET
Applying BI-FUEL System To Faras Power Station Diesel Generators
The running diesel generator (of power station) is consuming about 1350 Lit/day of diesel fuel.
The first suggestion was to convert the engine of diesel generator from Diesel fuel to GAS FUEL ENGINE using the GAS produced from Faras process as a fuel for power station especially that Faras field is providing 0.3 MMSCF of gas production.
A study was done to fulfill said target by studying firstly the requirements to convert diesel ENGINE to GAS engine.
First Suggestion :
(GAS FUEL SYSTEM CONVERSION)
Applying BI-FUEL System To Faras Power Station Diesel Generators
1- GAS fuel contents Gas fuel conversion required rich gas contents (high percent of C1 )
2- Generator Engine ability for conversion Generator have a conversion ability but it needs engine modification
and valuable cost
3- Keeping output power with the same rating after conversion. Output power may be affected by engine overheating
Gas Fuel Conversion Requirements
Applying BI-FUEL System To Faras Power Station Diesel Generators
A Gas analysis had been done to determine the GAS CONTENTS to be used as a fuel for Gas engines.
ComponentsN2CO2C1C2C3I-C4n-C4I-C5n-C5C6+
Volume % 3.000.5252.8017.7014.702.984.861.641.400.40
This Gas Analysis leads that the produced gas is not sufficient to be
used as a fuel for GAS ENGINES due to low contents of C1 and C2
which make engine not able to produce the required power.
The analysis concluded that :
Gas Analysis
Applying BI-FUEL System To Faras Power Station Diesel Generators
The efforts continued to get alternative solution to use our produced
gas as a fuel to save diesel consumption cost.
After search for alternatives and new technologies, the solution was
the new technology of
Search For Other Alternatives !!
“ BI FUEL SYSTEM “
Applying BI-FUEL System To Faras Power Station Diesel Generators
Introduction
- The bi-fuel system is defined a simultaneous combustion of two fuels in an engine.
- Diesel fuel and natural gas (Methane based) fuel mixture in a compression ignition (diesel) engine
Applying BI-FUEL System To Faras Power Station Diesel Generators
Bi Fuel System :
The concept of using bi-fuel on diesel engines is not new. RudolfDiesel,
who invented the engine bearing his name in the early1900's.
Natural gas became popular as an enriching fuel for this reasons:
- Its combustion characteristics .
- Extensive distribution infrastructure has been developed .
History of Bi-Fuel:
Applying BI-FUEL System To Faras Power Station Diesel Generators
The Bi-Fuel Conversion System (BFCS) has been designed to:-
Operates diesel engines utilizing a mixture of natural gas and diesel
fuel.
The gas percentages typically ranging from 30% to 70% of total fuel
consumed.
Allow users to adjust gas-diesel fuel mixtures according to the
specific requirements of the converted engine.
Work with all grades of diesel fuel and with all methane gas types
(including natural gas, bio-gas, well-head gas, etc.).
Technical Overview:
Applying BI-FUEL System To Faras Power Station Diesel Generators
Technical Overview:
Applying BI-FUEL System To Faras Power Station Diesel Generators
• BFCS allow the engine to be automatically returned to 100% diesel operation in the event of any of the following fault conditions:
-High Exhaust Gas Temperature -Low Natural Gas Pressure -High Natural Gas Pressure -Low Engine Oil Pressure -High Engine Manifold Pressure (MAP)
• The engine may also be returned to 100% diesel operation manually by
the operator. • Either automatic or manual switching from Bi-Fuel mode to 100% diesel
operation engine power output and stability is not interrupted.
Technical Overview:
Applying BI-FUEL System To Faras Power Station Diesel Generators
Fuel Usage As A Percent Of Load:
Applying BI-FUEL System To Faras Power Station Diesel Generators
Natural gas ignites at a much higher temperature (1150° - 1200° F)
compared to diesel fuel (500° - 750° F).
A diesel engines can not operate on 100% natural gas, because the
heat generated during compression is not sufficient to ignite this
fuel. To create ignition in bi-fuel engines, a small amount of diesel
fuel must be injected.
Applying BI-FUEL System To Faras Power Station Diesel Generators
Technical Overview:
• Cylinder high temperatures causes the diesel fuel to ignite.
• Created Flame reaches a temperature to ignite the natural gas
• With most designs, the diesel fuel is delivered using the
injectors that already exist on the engine.
• Additional components are installed to deliver natural gas into
the combustion chamber.
There are three proven methods that have been employed to do this:
• Low Pressure Injected Natural Gas (LPING)• High Pressure Injected Natural Gas (HPING)• Combustion Air Gas Integration
Bi-fuel Methods And Operation:
Applying BI-FUEL System To Faras Power Station Diesel Generators
Bi-Fuel System Description :
Applying BI-FUEL System To Faras Power Station Diesel Generators
- Bi-Fuel Control Panel
- Diesel Fuel Control Valve
- Gas Control Valve
- Gas Power Valve
- Manual Gas Valve
- Gas Solenoid Valve
- Air-Gas Mixer
- Gas Regulator
- Natural Gas Pressure Transducer
- Air Manifold Pressure Transducer
- EGT Thermocouples
Bi-Fuel system components:
Applying BI-FUEL System To Faras Power Station Diesel Generators
Gas Train
Applying BI-FUEL System To Faras Power Station Diesel Generators
Air-Gas Mixer
Applying BI-FUEL System To Faras Power Station Diesel Generators
Manifold air pressure (MPA)
Engine Exhaust Temp.
Applying BI-FUEL System To Faras Power Station Diesel Generators
The BFCS consists of three major sub-systems:
1. Gas Control Sub-System
2. Diesel Control Sub-System
3. Electronic Monitoring and Control Sub-System
Bi-fuel Control Sub Systems:
Applying BI-FUEL System To Faras Power Station Diesel Generators
Knock is defined as Pre-ignition occurs when a portion of the air/fuel mixture spontaneously prior to the desired moment of ignition.
This results in a "collision" of three pressure waves:
1) The flame front from the spontaneously ignited fuel 2) The flame front created by the normal ignition source 3) The piston compressing the air / fuel mixture
The best solution is to detect when engine approaching pre-ignition and take corrective action prior to its occurrence.
Active Knock Prevention
Applying BI-FUEL System To Faras Power Station Diesel Generators
Bi-fuel engines are equipped with
piezoelectric accelerometers adjacent to
each cylinder. These sensors electrically send elect.
signals to the Anti knocking device
(knocking detector) Knocking detector send signal to BI-fuel
controller Knowing engine position and
speed. The bi-fuel controller immediately initiates
a reduction of natural gas supply to lean
out the air/fuel ratio. This is accomplished via a motorized gas
control valve located in the natural gas
supply line.
Anti-knocking device
Applying BI-FUEL System To Faras Power Station Diesel Generators
By applying the BI Fuel System to Faras power station diesel
generator, the following are concluded :
1- Cost Saving :
Reduce the diesel fuel consumption by 30-70%
(about 1000 lit/day for our system)
- Fuel cost saving:
- Daily ≈ 3300 LE/day (Diesel price 3.3 ≈ LE/liter)
- Annually ≈ 1,204,500.00 LE/year ≈ 207,672.5
$/year
- Bi Fuel System Lump Sump Cost = $ 35,000
Conclusion And Advantages Of The System
Applying BI-FUEL System To Faras Power Station Diesel Generators
2- Cleaner burning, natural gas reduces exhaust emissions.
3- No engines modifications required.
4- No power or efficiency losses.
5- Low cost and easy to install (2-3 Months investment payback
period)
6- Extended run time capabilities
7-Reduced diesel fuel storage requirements
8-Lower capital cost per kilowatt (kW) compared to spark-ignited
engines
9- Improved reliability with redundant fuel supply
10- Reduced maintenance costs
Applying BI-FUEL System To Faras Power Station Diesel Generators
Conclusion And Advantages Of The System
Questions
Applying BI-FUEL System To Faras Power Station Diesel Generators