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STUDIES OF THE CONFINED COMBUSTION OF RESIDUAL FUEL OILS DURING THE YEARS 1986 AND 1987

Objective

THE OVERALL OBJECTIVE OF THE R & D WORK IS TO CORRELATE THE CHEMICAL COMPOSITION OF RF (RESIDUAL FUEL) OILS WITH THEIR IGNITION, COMBUSTION AND SOOT FORMING PROPERTIES UNDER REALISTIC ENGINE CONDITIONS WITH PARTICULAR REFERENCE TO LOW-LOAD.

THE WORK FALLS INTO THE FOLLOWING MAIN AREAS:

1.- COMBUSTION STUDIES OF RESIDUAL FUEL OILS:
COMBUSTION STUDIES OF SELECTED RESIDUAL FUELS AND SOME FUTURE FUELS WILL BE UNDERTAKEN IN A UNIQUE LARGE HIGH-PRESSURE HIGH-TEMPERATURE CELL WHICH IS CAPABLE OF HANDLING HIGH VISCOSITY FUELS AND PRODUCING GAS CONDITIONS OF UP TO 120 BAR AND 800 CELSIUS DEGREES. THE MAIN AIM OF THE WORK WILL BE TO CORRELATE COMBUSTION PHENOMENA WITH THE DERIVED CHARACTERISTIC PARAMETERS OF THEIR CHEMICAL COMPOSITION. THE PARTICULAR COMBUSTION PHENOMENA OF INTEREST WILL INCLUDE VAPOUR PHASE AROUND THE PULSED SPRAY IGNITION DELAY, RATE OF COMBUSTION, DEPOSIT FORMATION AND CATALYTIC EFFECTS OF TRACE METALS.
FUELS WILL INCLUDE HIGHLY-AROMATIC ONES, AND HIGHLY-CRACKED (BOTH THERMAL AND CATALYTIC ) RESIDUES FROM DIFFERENT CRUDE SOURCES.

2.- PREPARATION AND CHEMICAL ANALYSIS OF SPECIAL RESIDUAL FUEL OILS.
IN ORDER TO VARY INDEPENDENTLY THE FUEL PARAMETERS WHICH MAY INFLUENCE COMBUSTION A RANGE OF SPECIAL RESIDUAL FUELS IN WHICH CERTAIN CONSTITUENTS ARE PRESENT AT A CONTROLLED LEVEL WILL BE SELECTED.
THESE FUELS WILL BE SUBJECT TO FURTHER CHEMICAL ANALYSIS BY N M R, GC/MS, TGA AND IR ANALYSIS OF EVOLVED GASES DURING TGA TO YIELD THE CHARACTERISTIC PARAMETERS OF THEIR CHEMICAL COMPOSITION.

3.- COMBUSTION STUDIES OF MODEL FUELS:
THE IGNITION AND COMBUSTION OF MODEL FUELS WILL BE INVESTIGATED IN A SMALL HIGH-PRESSURE HIGH-TEMPERATURE CELL. IN PARTICULAR CHEMICAL TYPES, E G BRANCHED-CHAIN ALKANES AND AROMATICS, WILL BE STUDIED TOGETHER WITH THE EFFECT OF FUEL PYROLYSIS PRIOR TO IGNITION.
DEVELOPMENT OF SPECTROSCOPIC TECHNIQUES FOR STUDYING FUEL SPRAY VAPOUR AND EVOLVED GASES, TOGETHER WITH METHODS FOR COLLECTING PRE-IGNITION PYROLYSIS PRODUCTS AND COMBUSTION DEPOSITS WILL BE INVOLVED.

4.- COMBUSTION MODEL:
WORK WILL BE UNDERTAKEN IN BUILDING THE FOUNDATION FOR A RELIABLE COMBUSTION MODEL, INITIALLY BY CALCULATING RATES OF CHEMICAL ATTACK AT KEY SITES IN AROMATIC STRUCTURES, AND THE RATE OF VAPOURIZATION FROM A BINARY FUEL TO OBTAIN VAPOUR COMPOSITION IN A SPRAY SITUATION. SUCH CALCULATION WILL BE CHECKED AGAINST EXPERIMENT RESULTS.

Funding Scheme

CSC - Cost-sharing contracts

Coordinator

United Kingdom Atomic Energy Authority
Address
353,Harwell
OX11 0RA Didcot - Oxfordshire
United Kingdom

Participants (7)

ELF
France
Address

Lyon
GEBS
United Kingdom
Address

London
LLOYD'S REGISTER OF SHIPPING
United Kingdom
Address

London
Lucas Bryce
United Kingdom
Address

GL1 Gloucester
Mirlem Blustone
United Kingdom
Address

SK1 Stockport
Ruston
United Kingdom
Address

WA1 Warrington
WARKDA
Finland
Address

Vasa