skip to main content
DOE Patents title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Superheated fuel injection for combustion of liquid-solid slurries

Abstract

A method and device are claimed 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 reduced 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. 2 figs., 2 tabs.

Inventors:
Issue Date:
Research Org.:
Lawrence Berkeley Lab., CA (USA)
OSTI Identifier:
5898640
Application Number:
ON: DE85011624
Assignee:
Dept. of Energy EDB-85-082280
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
01 COAL, LIGNITE, AND PEAT; 33 ADVANCED PROPULSION SYSTEMS; 20 FOSSIL-FUELED POWER PLANTS; 42 ENGINEERING; FUEL INJECTION SYSTEMS; DESIGN; FUEL SLURRIES; COMBUSTION; BOILERS; COAL; DIESEL ENGINES; FURNACES; GAS TURBINES; IGNITION; MIXTURES; WATER; CARBONACEOUS MATERIALS; CHEMICAL REACTIONS; DISPERSIONS; ENERGY SOURCES; ENGINES; FOSSIL FUELS; FUEL SYSTEMS; FUELS; HEAT ENGINES; HYDROGEN COMPOUNDS; INTERNAL COMBUSTION ENGINES; MACHINERY; MATERIALS; OXIDATION; OXYGEN COMPOUNDS; SLURRIES; SUSPENSIONS; THERMOCHEMICAL PROCESSES; TURBINES; TURBOMACHINERY; 014000* - Coal, Lignite, & Peat- Combustion; 330800 - Emission Control- Alternative Fuels; 200100 - Fossil-Fueled Power Plants- Power Plants & Power Generation; 421000 - Engineering- Combustion Systems

Citation Formats

Robben, F.A. Superheated fuel injection for combustion of liquid-solid slurries. United States: N. p., 1984. Web.
Robben, F.A. Superheated fuel injection for combustion of liquid-solid slurries. United States.
Robben, F.A. Fri . "Superheated fuel injection for combustion of liquid-solid slurries". United States.
@article{osti_5898640,
title = {Superheated fuel injection for combustion of liquid-solid slurries},
author = {Robben, F.A.},
abstractNote = {A method and device are claimed 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 reduced 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. 2 figs., 2 tabs.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1984},
month = {10}
}