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Exhaust gas condensates corrosion test on low pressure cooling system of aluminum brazed EGR, WCAC and ACAC

机译：废气在铝钎焊EGR，WCAC和ACAC低压冷却系统上的冷凝水腐蚀试验

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摘要

New emission regulations require innovation in engine air loop. To satisfy these requirements, new architectures of cooling systems are in process of development. These systems use valves to regulate the exhaust gases pressure and distribution in the cooling loop and combustion chamber. Since lower pressure is involved in the Exhaust Gas Recycling (EGR), Water Charge Air Cooler (WCAC) or Air Charge Air Cooler (ACAC), the condensation of exhaust gases takes place and very acidic solutions are generated. In absence of such new architecture of cooling system in service and in order to evaluate the corrosion risk that the acidic solutions from exhaust gases condensates could create in the EGR system, several tests have been proposed as representatives for simulation of service conditions. A new bench test was developed to provide an evaluation of the corrosion resistance using the pressure, flow rate, temperature and composition of the condensates corresponding to the identified parameters of service. Descriptions and discussion of the tests protocol and results are included in the presentation. The aim of this paper is to present the functionality of the test bench, the test results and perspectives to improve the corrosion resistance of the heat exchanger components.
机译：新的排放法规要求对发动机空气回路进行创新。为了满足这些要求，正在开发新的冷却系统架构。这些系统使用阀门来调节冷却回路和燃烧室中的废气压力和分布。由于废气再循环（EGR），水增压空气冷却器（WCAC）或空气增压空气冷却器（ACAC）涉及的压力较低，因此会发生废气冷凝，并产生极酸性的溶液。在没有使用这种冷却系统的新体系结构的情况下，并且为了评估废气冷凝物中酸性溶液可能在EGR系统中产生的腐蚀风险，提出了几种测试来模拟使用条件。开发了一种新的台架试验，以使用压力，流速，温度和冷凝物的组成（对应于已确定的使用参数）评估耐腐蚀性。演示中包括对测试协议和结果的描述和讨论。本文的目的是介绍测试台的功能，测试结果和改善热交换器部件耐腐蚀性的观点。

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