Systems and Methods for On-Site Mixing and Dispensing of a Reducing Agent Solution for Use with a Diesel Catalytic Converter

摘要

Systems and methods for mixing and dispensing an aqueous urea solution at the point of delivery to diesel powered vehicles. A standalone terminal or modular unit that mixes and dispenses the dilute solution on an as-needed batch basis provides one implementation of the invention. Each delivery terminal includes a dry or concentrated liquid urea reservoir, and a metering urea dispenser, along with a parallel demineralized water reservoir and a metering water dispenser. The demineralized water may be provided directly from an external source or the system may include a demineralizing component. The metered dispensing of the urea and the water into a mixing tank to produce the aqueous urea solution (AUS) is automatically controlled through an electronic control system. From the mixing tank the system directs the solution through a sediment filtration system before retaining the mixed and filtered solution in a terminal holding and dispensing tank.