这个冬天,雾霾再度成为国民话题。雾霾缘何频繁来袭、屡驱不散?其中,汽车尾气排放的超标被公认为是雾霾的主要成因之一,而以柴油动力为主的大型车辆则成为尾气污染的重要来源。目前国际上普遍使用“SCR选择性催化还原技术”将尿素溶液喷入热的发动机尾气进行尾气处理,这一技术在国内长 This winter, haze once again become a national topic. Among them, the excessive emission of automobile exhaust is recognized as one of the major causes of haze, while the large-scale diesel-powered vehicles have become an important source of tail gas pollution. At present, the widespread use of “SCR selective catalytic reduction technology” injects the urea solution into the hot engine tail gas for tail gas treatment. This technology is widely used in China