使用不合格车用尿素有哪些危险性?

日期:2020-12-21 | 人气:97

严格意义上的车用尿素溶液,是由32.5%高纯度车用尿素和67.5%的去离子水组成的。其中的去离子水,需要在普通自来水的基础上进行数十次的过滤净化,才能保证纯度合格。而与普通的农用尿素相比,车用尿素在微金属含量指标控制方面的要求要严格得多,这些控制要求是决定车用尿素溶液质量是否合格的重要因素。由此可见,某些“小作坊”式的企业为了降低生产成本,使用普通的水代替去离子水,使用农用尿素代替车用尿素,这样生产出来的车用尿素溶液,与合格产品之间的质量可以说有天壤之别。

Strictly speaking, the vehicle urea solution is composed of 32.5% high purity vehicle urea and 67.5% deionized water. On the basis of ordinary water purification, dozens of times of water purification can be guaranteed. Compared with the common agricultural urea, the requirements for the control of micro metal content index of vehicle urea are much more strict. These control requirements are important factors to determine whether the quality of vehicle urea solution is qualified. Therefore, in order to reduce production costs, some "small workshop" enterprises use ordinary water instead of deionized water, and use agricultural urea instead of vehicle urea. The quality of vehicle urea solution produced in this way is quite different from that of qualified products.

使用不合格的车用尿素,轻者会降低氮氧化物转化效率,重者会直接破坏车辆后处理系统,造成不可逆转的机械性故障,甚至造成发动机报废,带来上万元甚至十几万元的巨大损失。车用尿素质量是如何在使用中影响到整车及SCR系统的呢?

The use of unqualified urea for vehicles will reduce the conversion efficiency of nitrogen oxides in light cases, and directly damage the after-treatment system of vehicles in severe cases, resulting in irreversible mechanical failure and even engine scrapping, resulting in huge losses of tens of thousands of yuan or even more than 100000 yuan. How does the quality of vehicle urea affect the vehicle and SCR system in use?

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首先,车用尿素溶液的浓度是影响SCR系统的关键因素之一。尿素浓度直接关系到氮氧化物的催化效率和尿素溶液的凝固点,而且也影响了后处理系统的参数设定,优质的车用尿素溶液的浓度必须在规定的范围之内,这是劣质产品难以实现的。

Firstly, the concentration of vehicle urea solution is one of the key factors affecting SCR system. The concentration of urea is directly related to the catalytic efficiency of nitrogen oxides and the freezing point of urea solution, and also affects the parameter setting of after treatment system. The concentration of high-quality urea solution for vehicles must be within the specified range, which is difficult for inferior products to achieve.

其次,车用尿素的质量对SCR系统喷雾附件、催化剂也会造成不良影响。不合格的车用尿素中存在不溶于水的杂质,堵塞滤清器、尿素溶液输送管道和喷嘴。杂质燃烧后产生的积炭,会影响后处理系统喷雾附件,对催化剂骨架进行堵塞,造成催化剂效率和使用寿命降低。

Secondly, the quality of vehicle urea also has adverse effects on spray attachment and catalyst of SCR system. The unqualified vehicle urea contains impurities insoluble in water, which block the filter, urea solution delivery pipeline and nozzle. The coke deposition after combustion of impurities will affect the spray attachment of the postprocessing system and block the catalyst skeleton, resulting in the reduction of catalyst efficiency and service life.

另外,尿素浓度不达标,将出现排放超标故障,体现为发动机扭矩立即降低,车辆动力不足;在寒冷工况下,会直接导致计量泵冻坏

In addition, if the urea concentration does not meet the standard, the emission will exceed the standard, which is reflected in the immediate reduction of engine torque and insufficient vehicle power; in cold conditions, it will directly cause the metering pump to freeze

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