Superheated fuel injection for combustion of liquid-solid slurries

Patent · Mon Dec 31 23:00:00 EST 1984

OSTI ID:865699

Robben, Franklin A ^[1]

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1. Berkeley, CA

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.

• Research Organization: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA
• DOE Contract Number: AC03-76SF00098
• Assignee: United States of America as represented by United States (Washington, DC)
• Patent Number(s): US 4558664
• OSTI ID: 865699
• Country of Publication: United States
• Language: English

Related Subjects

/123/110/431/
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coal particle
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coal-water
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combustion
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liquid
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liquid-solid
method
near
near critical
obtaining
overall
particles
particles formed
particularly
particularly beneficial
preferentially
pressure
prevent
prevents
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rates
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reduces
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slurries
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