Superheated fuel injection for combustion of liquid-solid slurries
A method and device for obtaining, upon injection, flash evaporation of a liquid in a slurry fuel to aid in ignition and combustion. The device is particularly beneficial for use of coal-water slurry fuels in internal combustion engines such as diesel engines and gas turbines, and in external combustion devices such as boilers and furnaces. The slurry fuel is heated under pressure to near critical temperature in an injector accumulator, where the pressure is sufficiently high to prevent boiling. After injection into a combustion chamber, the water temperature will be well above boiling point at a reducted pressure in the combustion chamber, and flash boiling will preferentially take place at solid-liquid surfaces, resulting in the shattering of water droplets and the subsequent separation of the water from coal particles. This prevents the agglomeration of the coal particles during the subsequent ignition and combustion process, and reduces the energy required to evaporate the water and to heat the coal particles to ignition temperature. The overall effect will be to accelerate the ignition and combustion rates, and to reduce the size of the ash particles formed from the coal.
- Assignee:
- The United States of America as represented by the United States Department of Energy
- Patent Number(s):
- US 4558664
- OSTI ID:
- 5744265
- Country of Publication:
- United States
- Language:
- English
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Superheated fuel injection for combustion of liquid-solid slurries
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Related Subjects
014000 -- Coal
Lignite
& Peat-- Combustion
33 ADVANCED PROPULSION SYSTEMS
330102 -- Internal Combustion Engines-- Diesel
330103 -- Internal Combustion Engines-- Turbine
330800* -- Emission Control-- Alternative Fuels
ASHES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL FINES
COMBUSTION
COMBUSTION KINETICS
DESIGN
DIESEL ENGINES
DISPERSIONS
DROPLETS
ENGINES
EVAPORATION
FLASHING
FUEL INJECTION SYSTEMS
FUEL SLURRIES
FUEL SYSTEMS
FUELS
GAS TURBINE ENGINES
HEAT ENGINES
HEATING
HYDROGEN COMPOUNDS
IGNITION
INTERNAL COMBUSTION ENGINES
KINETICS
MIXTURES
OXIDATION
OXYGEN COMPOUNDS
PARTICLES
PHASE TRANSFORMATIONS
REACTION KINETICS
RESIDUES
SLURRIES
SUPERHEATERS
SUPERHEATING
SUSPENSIONS
THERMOCHEMICAL PROCESSES
WATER