METHOD AND DEVICES FOR HEATING UREA-CONTAINING MATERIALS IN VEHICLE EMISSION CONTROL SYSTEM
First Claim
1. A system comprisingi. a container for containing a supply of a solid or liquid reducing material, wherein the container has one or more exits so that the reducing material can be removed from the container;
- ii. a gas producing reactor for converting at least some of the solid or liquid reducing material into ammonia and carbon dioxide, wherein the gas producing reactor is in fluid communication with the one or more exits of the container; and
iii. a heat storage device in thermal communication with the gas producing reactor and/or a region of the one or more exits of the container, wherein the heat storage device includes one or more thermal energy storage material in a sufficient amount so that the heat storage device is capable of heating at least a solid surface of the gas producing reactor and/or at least one or more exits of the container to a temperature sufficient for producing ammonia and/or carbon dioxide.
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Accused Products
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.
33 Citations
20 Claims
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1. A system comprising
i. a container for containing a supply of a solid or liquid reducing material, wherein the container has one or more exits so that the reducing material can be removed from the container; -
ii. a gas producing reactor for converting at least some of the solid or liquid reducing material into ammonia and carbon dioxide, wherein the gas producing reactor is in fluid communication with the one or more exits of the container; and iii. a heat storage device in thermal communication with the gas producing reactor and/or a region of the one or more exits of the container, wherein the heat storage device includes one or more thermal energy storage material in a sufficient amount so that the heat storage device is capable of heating at least a solid surface of the gas producing reactor and/or at least one or more exits of the container to a temperature sufficient for producing ammonia and/or carbon dioxide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method comprising a step of maintaining a solid surface temperature of a vehicle ammonia-producing reactor above 200°
- C. using stored waste heat.
- View Dependent Claims (10, 11, 12, 13)
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14. A method comprising:
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feeding a feed portion of solid or liquid reducing material into a gas producing reactor; heating the feed portion of the solid or liquid reducing material, using heat stored in a heat storage device, to a temperature sufficiently high that thermolysis and/or hydrolysis occurs; wherein the solid or liquid reducing material has a concentration of urea of about 50 wt. % or more, based on the total weight of the solid or liquid reducing material; and the heat storage device includes a thermal energy storage material having a liquidus temperature sufficiently high that the urea-containing material can be heated using latent heat and/or sensible heat from the thermal energy storage material. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification