Patent ID: 8689545

Claim:
A device for evaporating a predeterminable volume of a fluid, the device comprising: a feed line configured to supply a urea and water solution as the fluid for providing ammonia as a reducing agent in an exhaust gas of internal combustion engines; an evaporator surface configured to receive the fluid through said feed line; an evaporator channel having a tortuous course, said evaporator channel having a surface included in said evaporator surface; at least one variable parameter selected from the group consisting of: a) a radius of curvature of said evaporator channel; b) a through-flow cross section of said evaporator channel; and c) a volume adding rate of the fluid; a dividing device for dividing, said dividing device configured for dividing the predeterminable volume of the fluid into individual partial volumes of different size before entering said feed line, said dividing device including a conveying pump and a regulatable valve or a metering pump; said conveying pump and said regulatable valve or said metering pump for regulating the delivery of the partial volumes to varying positions on a region of said evaporator surface, said conveying pump and said regulatable valve or said metering pump being configured for being controlled on the basis of at least one of the following parameters: i) a mass of a corresponding partial volume, or ii) a volume adding rate of the corresponding partial volume.