CN111635251A - 一种轻量化高耐久scr载体 - Google Patents
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Abstract
本发明公开了一种轻量化高耐久SCR载体,包括以下步骤:S1、称量配料:按照一定重量分数称量配料;S2、粉料水分检测:对配料中的水分进行检测,使配料中的水分保持在。本发明制备的轻量化高耐久SCR载体,利用多次均化处理,使产生的T4非道路柴油发动机用DPF孔隙分布更接近于正态单峰分布,有利于涂层、碳烟的铺展,同时有效的控制了再生温度梯度≤250℃/cm的极限值,有效的改善了部件的使用效果和延长了部件的使用寿命;通过对原材料和烧结过程进行了优化、改进,大大减少了设备的磨损,降低了设备工装的更换频次,提高了产品一致性;减少了污染物的烧成排放。
Description
技术领域
本发明涉及催化剂技术领域,尤其涉及一种轻量化高耐久SCR载体。
背景技术
随着人们对环保生态的重视,排气污染物的限值被要求的越来越严格,列如CO,THC,NOx排放限值的设置,这就需要调整或者改进整个后处理系统。
排气后处理系统必须实现SCR载体、三元催化转化器TWC和颗粒捕集器的紧密耦合,且尽量靠近发动机排气管口,高排气温度,要求SCR载体、TWC载体必须具有更高的耐热冲击能力,作为应用于尾气处理的催化剂载体必须具备以下条件:
(1)较低的热膨胀系数,热膨胀系数≤0.8×10-6/℃;
(2)较好的耐热冲击能力,650℃热冲击三次不开裂;
(3)较小的体积密度,每升载体重量≤370克;
(4)超薄壁,壁厚4mil,3mil,甚至2mil。
原有的SCR载体生产技术这4项指标不能完全满足,例如:耐热性能差,壁厚在6mil及以上。
发明内容
基于背景技术存在的技术问题,本发明提出了一种轻量化高耐久SCR载体,其利用多次均化处理,使产生的T4非道路柴油发动机用DPF孔隙分布更接近于正态单峰分布,有利于涂层、碳烟的铺展(不易造成厚薄不均的分布状态),同时有效的控制了再生温度梯度≤250℃/cm的极限值,有效的改善了部件的使用效果和延长了部件的使用寿命;通过对原材料和烧结过程进行了优化、改进,大大减少了设备的磨损,降低了设备工装的更换频次,提高了产品一致性;减少了污染物的烧成排放。
本发明提出的一种轻量化高耐久SCR载体,包括以下步骤:
S1、称量配料:按照一定重量分数称量配料;
S2、粉料水分检测:对配料中的水分进行检测,使配料中的水分保持在;
S3、球磨:对检测完成的配料进行球磨,使配料的粒径达到100-140目;
S4、筛选:采用超声波对球磨后的配料进行筛选,除去粒径不达标的配料;
S5、混料:通过混料机将筛选后的粉体材料混合均匀;
S6、捏合:对混合均匀的粉体内加入添加剂进行捏泥;
S7、练泥:通过真空练泥机对所述步骤S7制备的泥料进行挤压,排除空气排出泥料中的空气;
S8、开泥段:
S9、成型:将所述步骤S8制备的泥料加工成型;
S10、微波干燥:对所述步骤S9加工成型的泥料进行微波干燥;
S11、切坯:将所述步骤S10制备的干燥泥料切割成规则的坯料;
S12:吹坯:将所述步骤S11坯料表面的杂物以及粉料吹去;
S13、半成品检验:对除去杂物和粉料的坯料进行检验,需保证产品尺寸、垂直度、内孔无碎屑和外观完整性;
S14、烧制:对检测合格的泥料进行烧制;
S15、平面磨:对烧制成型的泥料的端部进行打磨,使烧制成型的产品高度统一;
S16、外圆磨:对烧制成型的泥料的外部四周进行打磨,使烧制成型的产品直径统一;
S17、吹扫:对打磨好的产品进行吹扫,保证产品内孔无碎屑和灰尘;
S18:热风干燥:对吹扫完成的产品进行热风干燥;
S20、外皮料配制:
S21、上外皮:将配置好的外皮料均匀的涂抹在产品的表面;
S22、微波干燥:对涂抹有外皮料的产品进行微波干燥;
S23、打磨、修整:对所述步骤S22干燥成型的产品进行打磨修整;
S24、对步骤S23制备成型的产品进行成品检验。
优选地,所述步骤S1中,所述配料为低钠浮选滑石粉35-45wt.%、超细勃姆石1-5wt.%、轻质煅烧高领土5-15wt.%、片状水洗高岭土5-15wt.%、99级-煅烧刚玉粉15-30wt.%、高粘增塑剂1-3wt.%、低粘增塑剂1-3wt.%、表面活性剂2-3wt.%、陶瓷保湿剂1-3wt.%、低电导率高纯水22-28%。
优选地,所述步骤S12中,所述步骤S12中,在对坯料进行吹坯时,需保证内孔无碎屑。
优选地,所述步骤S24中,需要对成型产品的直径、高度、垂直度、内孔无碎屑、重量、外观完整性进行检测。
本发明具有以下有益效果;
1、利用多次均化处理,使产生的T4非道路柴油发动机用DPF孔隙分布更接近于正态单峰分布,有利于涂层、碳烟的铺展(不易造成厚薄不均的分布状态),同时有效的控制了再生温度梯度≤250℃/cm的极限值,有效的改善了部件的使用效果和延长了部件的使用寿命;
2、采用本生产工艺,使得泥料组织更均匀,可塑性能和致密度也更好;
3、通过对原材料和烧结过程进行了优化、改进,大大减少了设备的磨损,降低了设备工装的更换频次,提高了产品一致性;减少了污染物的烧成排放。
具体实施方式
下面结合具体实施例对本发明作进一步解说。
一种轻量化高耐久SCR载体,包括以下步骤:
S1、称量配料:按照一定重量分数称量配料;
S2、粉料水分检测:对配料中的水分进行检测,使配料中的水分保持在;
S3、球磨:对检测完成的配料进行球磨,使配料的粒径达到100-140目;
S4、筛选:采用超声波对球磨后的配料进行筛选,除去粒径不达标的配料;
S5、混料:通过混料机将筛选后的粉体材料混合均匀;
S6、捏合:对混合均匀的粉体内加入添加剂进行捏泥;
S7、练泥:通过真空练泥机对所述步骤S7制备的泥料进行挤压,排除空气排出泥料中的空气;
S8、开泥段:
S9、成型:将所述步骤S8制备的泥料加工成型;
S10、微波干燥:对所述步骤S9加工成型的泥料进行微波干燥;
S11、切坯:将所述步骤S10制备的干燥泥料切割成规则的坯料;
S12:吹坯:将所述步骤S11坯料表面的杂物以及粉料吹去;
S13、半成品检验:对除去杂物和粉料的坯料进行检验,需保证产品尺寸、垂直度、内孔无碎屑和外观完整性;
S14、烧制:对检测合格的泥料进行烧制;
S15、平面磨:对烧制成型的泥料的端部进行打磨,使烧制成型的产品高度统一;
S16、外圆磨:对烧制成型的泥料的外部四周进行打磨,使烧制成型的产品直径统一;
S17、吹扫:对打磨好的产品进行吹扫,保证产品内孔无碎屑和灰尘;
S18:热风干燥:对吹扫完成的产品进行热风干燥;
S20、外皮料配制:
S21、上外皮:将配置好的外皮料均匀的涂抹在产品的表面;
S22、微波干燥:对涂抹有外皮料的产品进行微波干燥;
S23、打磨、修整:对所述步骤S22干燥成型的产品进行打磨修整;
S24、对步骤S23制备成型的产品进行成品检验。
本发明利用多次均化处理,使产生的T4非道路柴油发动机用DPF孔隙分布更接近于正态单峰分布,有利于涂层、碳烟的铺展(不易造成厚薄不均的分布状态),同时有效的控制了再生温度梯度≤250℃/cm的极限值,有效的改善了部件的使用效果和延长了部件的使用寿命;通过对原材料和烧结过程进行了优化、改进,大大减少了设备的磨损,降低了设备工装的更换频次,提高了产品一致性;减少了污染物的烧成排放。
以上所述,仅为本发明较佳的具体实施方式,但本发明的保护范围并不局限于此,任何熟悉本技术领域的技术人员在本发明揭露的技术范围内,根据本发明的技术方案及其发明构思加以等同替换或改变,都应涵盖在本发明的保护范围之内。
Claims (4)
1.一种轻量化高耐久SCR载体,其特征在于,包括以下步骤:
S1、称量配料:按照一定重量分数称量配料;
S2、粉料水分检测:对配料中的水分进行检测,使配料中的水分保持在;
S3、球磨:对检测完成的配料进行球磨,使配料的粒径达到100-140目;
S4、筛选:采用超声波对球磨后的配料进行筛选,除去粒径不达标的配料;
S5、混料:通过混料机将筛选后的粉体材料混合均匀;
S6、捏合:对混合均匀的粉体内加入添加剂进行捏泥;
S7、练泥:通过真空练泥机对所述步骤S7制备的泥料进行挤压,排除空气排出泥料中的空气;
S8、开泥段:
S9、成型:将所述步骤S8制备的泥料加工成型;
S10、微波干燥:对所述步骤S9加工成型的泥料进行微波干燥;
S11、切坯:将所述步骤S10制备的干燥泥料切割成规则的坯料;
S12:吹坯:将所述步骤S11坯料表面的杂物以及粉料吹去;
S13、半成品检验:对除去杂物和粉料的坯料进行检验,需保证产品尺寸、垂直度、内孔无碎屑和外观完整性;
S14、烧制:对检测合格的泥料进行烧制;
S15、平面磨:对烧制成型的泥料的端部进行打磨,使烧制成型的产品高度统一;
S16、外圆磨:对烧制成型的泥料的外部四周进行打磨,使烧制成型的产品直径统一;
S17、吹扫:对打磨好的产品进行吹扫,保证产品内孔无碎屑和灰尘;
S18:热风干燥:对吹扫完成的产品进行热风干燥;
S20、外皮料配制:
S21、上外皮:将配置好的外皮料均匀的涂抹在产品的表面;
S22、微波干燥:对涂抹有外皮料的产品进行微波干燥;
S23、打磨、修整:对所述步骤S22干燥成型的产品进行打磨修整;
S24、对步骤S23制备成型的产品进行成品检验。
2.根据权利要求1所述的一种轻量化高耐久SCR载体,其特征在于,所述步骤S1中,所述配料为低钠浮选滑石粉35-45wt.%、超细勃姆石1-5wt.%、轻质煅烧高领土5-15wt.%、片状水洗高岭土5-15wt.%、99级-煅烧刚玉粉15-30wt.%、高粘增塑剂1-3wt.%、低粘增塑剂1-3wt.%、表面活性剂2-3wt.%、陶瓷保湿剂1-3wt.%、低电导率高纯水22-28%。
3.根据权利要求1所述的一种轻量化高耐久SCR载体,其特征在于,所述步骤S12中,所述步骤S12中,在对坯料进行吹坯时,需保证内孔无碎屑。
4.根据权利要求1所述的一种轻量化高耐久SCR载体,其特征在于,所述步骤S24中,需要对成型产品的直径、高度、垂直度、内孔无碎屑、重量、外观完整性进行检测。
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