挑选性催化复原手艺（SCR）是针对柴油车尾气排放中NOx的一项处置工艺，也是今朝重型柴油机下降排放的最首要手腕之一。

这项手艺必须依托(tuo)尿(niao)素溶液对(dui)尾气中的(de)氮氧(yang)化(hua)(hua)(hua)物(wu)停止处置，操纵尿(niao)素溶液在策妄念低温制冷的(de)效果(guo)氮꧅氧(yang)化(hua)(hua)(hua)合(he)(he)物(wu)热(re)解之后生的(de)氨，是(shi)汽油便捷车(che)俩氮氧(yang)化(hua)(hua)(hua)合(he)(he)物(wu)做好性催化(hua)(hua)(hua)复原的(de)复原剂，从而使尾气中的(de)氮氧(yang)化(hua)(hua)(hua)物(wu)转化(hua)(hua)(hua)为有害的(de)水蒸汽和氮气，削减排放(fang)(fang)。是(shi)以，车(che)用尿(niao)素能(neng)够说是(shi)重(zhong)型卡车(che)、客车(che)等(deng)柴油车(che)到达(da)国六排放(fang)(fang)规范(fan)的(de)BI备产物(wu)。

车(che)用(yong)磷酸(suan)(suan)二(er)氢钾(jia)液饱和盐溶液是通明、清亮的的液状体，呈淡黄色(se)，酸(suan)(suan)度在(zai)31.8%-33.2%彼此，采(cai)用(yong)复原了氮氧(yang)化的合(he)物。今时应用(yong)的车(che)用(yong)磷酸(suan)(suan)二(er)氢钾(jia)液饱和盐溶液常见的由32.5%高纯磷酸(suan)(s﷽uan)二(er)氢钾(jia)液和67.5%的去铝(lv)离子水形成。

车用尿(niao)素溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)别号(hao)柴油发动(dong)机(ji)机(ji)排放预防液(ye)(ye)(ye)(ye)(ye)，國际俗通称：客(ke)车尿(niao)素溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)溶(rong)(ronཧg)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)，车用尿(niao)素溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye♎)(ye)(ye)(ye)(ye)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)，客(ke)车绿色环(huan)保尿(niao)素溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)液(ye)(ye)(ye)(ye)(ye)溶(rong)(rong)(rong)(rong)(rong)液(ye)(ye)(ye)(ye)(ye)，车用脱硝剂，而叫的最PU遍的便(bian)是(shi)车用尿(niao)素。

车(che)用(yong)(yong)尿(niao💫)素溶(rong)液用(yong)(yong)于(yu)轻型柴油车(che)车(che)车(che)达成国六(liu)标准(zhun)污染(ran)(ran)物(wu)(wu)相同具体的二环，其作用(yong)(yong)是只为核(he)减氮(dan)空气氧化合物(wu)(wu)污染(ran)(ran)物(wu)(wu)，是的降低(di)柴油车(che)车(che)车(che)净(jing)化处理物(wu)(wu)污染(ran)(ran)物(wu)(wu)量的关头。下面的网编搜集(ji)哪些项目(mu)车(che)用(yong)(yong)尿(niao)素液的检测工具关键(jian)：

尿素含量

尿(niao)素含量(liang)间(jian)接影响NOx的催化(hua)(hua)效(xiao)力(li)和尿(niao)素溶(rong)(rong)液(ye)的凝结(jie)点。尿(niao)素溶(rong)(rong)液(ye)的浓度太(tai)高(gao)或太(tai)低不只不能进步NOx的转化(hua)(hua)效(xiao)力(li),反而(er)会型成二(er)氧化(hua)(hua)氮的漏失(shi)(可能太(tai)高(gao)的NHs/N༒Ox 比型成的二(er)氧化(hua)(hua)氮漏失(shi))，形(xing)成二(er)次净化(hua)(hua)物(氨气)。

密度

折光率

碱度

缩二脲

不溶物

不(bu)溶(rong)物是磷酸二氢钾溶(rong)剂中的不(bu)溶(rong)解(jie)于水的残渣,不(bu)溶(rong)物的存在(zai)着(zhe)对(dui)车用磷酸二氢钾氢氧化钠(na)溶(rꦉ꧋ong)液的保送(song)生输送(song)管和喷水嘴(zui)具备分险,可构成(cheng)梗塞。

甲酸、金属离子、磷酸盐等