Method and devices for heating urea-containing materials in vehicle emission control system
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United States of America Patent
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Jan 29, 2013
Grant Date -
Feb 23, 2012
app pub date -
Aug 15, 2011
filing date -
Aug 19, 2010
priority date (Note) -
Expired
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Abstract
The invention relates to systems and methods for heating a solid or liquid reducing material such as an urea-containing material for NOx selective catalytic reduction (‘SCR’) using a heat stored in a thermal energy storage material, such as a phase change material. The stored heat may be heat from an exhaust waste, such as from an exhaust gas of an internal combustion engine. The reducing material may be a solid reducing material. Other reducing materials include aqueous solutions such as an aqueous solution containing, consisting essentially of, or consisting of urea and water. In one aspect, the process may include a step of evaporating an aqueous solution of urea for immediate urea hydrolysis.
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