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

Abstract

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 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.

Inventors:
 [1]
  1. (Berkeley, CA)
Issue Date:
Research Org.:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
OSTI Identifier:
865699
Patent Number(s):
4558664
Assignee:
United States of America as represented by United States (Washington, DC) LBNL
DOE Contract Number:  
AC03-76SF00098
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
superheated; fuel; injection; combustion; liquid-solid; slurries; method; device; obtaining; flash; evaporation; liquid; slurry; ignition; particularly; beneficial; coal-water; fuels; internal; engines; diesel; gas; turbines; external; devices; boilers; furnaces; heated; pressure; near; critical; temperature; injector; accumulator; sufficiently; prevent; boiling; chamber; water; reduced; preferentially; solid-liquid; surfaces; resulting; shattering; droplets; subsequent; separation; coal; particles; prevents; agglomeration; process; reduces; energy; required; evaporate; heat; overall; effect; accelerate; rates; reduce; size; ash; formed; water temperature; subsequent separation; coal particle; ignition temperature; diesel engines; water slurry; coal-water slurry; combustion process; diesel engine; reduced pressure; critical temperature; internal combustion; combustion chamber; gas turbine; combustion engine; fuel injection; coal particles; slurry fuel; combustion engines; gas turbines; near critical; water droplets; particularly beneficial; slurry fuels; particles formed; energy required; flash evaporation; articles formed; combustion device; liquid surface; liquid surfaces; /123/110/431/

Citation Formats

Robben, Franklin A. Superheated fuel injection for combustion of liquid-solid slurries. United States: N. p., 1985. Web.
Robben, Franklin A. Superheated fuel injection for combustion of liquid-solid slurries. United States.
Robben, Franklin A. Tue . "Superheated fuel injection for combustion of liquid-solid slurries". United States. https://www.osti.gov/servlets/purl/865699.
@article{osti_865699,
title = {Superheated fuel injection for combustion of liquid-solid slurries},
author = {Robben, Franklin A.},
abstractNote = {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 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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1985},
month = {1}
}

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