摘要:
The invention relates to a method for controlling injection of a reductant into a NOx containing exhaust gas stream from a combustion engine, where combustion of a known fuel takes place and where the HOx is reduced by selective catalytic reduction, SCR, in the presence of a SCR catalyst, comprising establishing signals related to exhaust gas flow, HOx concentration in the exhaust gas stream upstream of the catalyst, exhaust gas temperature upstream of the SCR catalyst, exhaust gas temperature downstream of the SCR catalyst and to input data for catalyst characteristics. From the signals an adjusted amount of the reductant is calculated by using a calculated amount of reductant and a value d(E*T)/dt, where E is the exhaust gas flow, T is the exhaust gas temperature upstream of the catalyst and t is time.
摘要翻译:本发明涉及一种用于控制将还原剂注入含有来自内燃机的含NO x N 2废气流的方法,其中发生了已知燃料的燃烧,其中HO < 在SCR催化剂的存在下,通过选择性催化还原SCR来还原SUB,其包括在催化剂上游的排气流中建立与废气流,HO x x H浓度相关的信号,排气 SCR催化剂上游的温度,SCR催化剂下游的排气温度和输入催化剂特性的数据。 根据该信号,通过使用计算量的还原剂和d(E * T)/ dt计算还原剂的调整量,其中E是排气流量,T是催化剂上游的排气温度,t 是时候了
摘要:
The invention provides a method and a system for injection of a solution of a compound into a gas at elevated temperature, evaporating the solution and decomposing the compound in the gas at the elevated temperature, comprising injecting the solution into an injection channel being provided into at least a portion of an outer channel and being surrounded by and spaced apart from the outer channel, passing the gas along space between inner wall of the outer channel and outer wall of the injection channel and along inner space of the injection channel, evaporating the solution in and on inner wall of the injection channel and decomposing the compound in and on the inner wall of the injection channel and in the gas. The solution can be an aqueous solution comprising urea or ammonia, the gas is an exhaust gas from combustion and the injection channel typically is a cylindrical channel concentrically installed in the outer channel.
摘要:
Method and apparatus for uniformly injecting a fluid stream into a gas stream at elevated temperature by means of an injection nozzle comprising a nozzle head and a supply inner tube being concentrically surrounded with an outer casing tube spaced apart from the inner supply tube. It comprises passing the fluid stream through the inner tube and the nozzle head and maintaining temperature of the fluid stream in the inner tube by providing thermal insulation in at least part of an annular space between the inner tube and the outer tube. Further it comprises maintaining a constant flow of the fluid inside the inner tube and nozzle head by plugging the nozzle head at outlet end and spraying the fluid stream through a number of nozzle holes provided in the nozzle head adjacent to the outlet end of the nozzle head.