CN108612578A - 一种scr柴油发动机催化消声净化器尿素汽化装置 - Google Patents
一种scr柴油发动机催化消声净化器尿素汽化装置 Download PDFInfo
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- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F01N3/24—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by constructional aspects of converting apparatus
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Abstract
本发明涉及一种SCR柴油发动机催化消声净化器尿素汽化装置。包括贮存尿素液的添蓝罐、输送尿素液的尿素输送管、汽化容器及气体喷口,添蓝罐为双层罐体结构,利用发动机冷却水的余热加热添蓝罐中的尿素液,汽化容器是在计量泵至催化净化器这段尿素次级输送管上套装有陶瓷内管,在陶瓷内管外安装有电热丝,在电热丝上包裹有耐高温及绝缘保温棉,再用陶瓷外管套住保温棉,电热丝接入电源,通过调整电压、电流的可控硅来调整温度。尿素液在尿素次级输送管中被汽化容器加热而汽化,尿素液成为了尿素气,进入催化消声器中与废气混合均匀,提高了催化转化率,摒弃了高精密度喷嘴的使用,突破了氨参与催化净化过程的技术瓶颈,带来了革命性的技术进步。
Description
技术领域
本发明涉及一种SCR柴油发动机催化消声净化器尿素汽化装置 ,属于汽车发动机尾气后处理技术领域 。
背景技术
催化消声净化器是车用发动机尾气后处理的关键部件,是保证车辆尾气排放达到国家环保法规要求的重要部件,它的作用是将含有有害气体的尾气,通过催化转化器中催化剂的作用进行氧化与还原反应,变成无害气体排到空气中。在这个过程中,必须有氨气的参与,才有利于将尾气中的一氧化碳、碳氢化合物、氮氧化合物、铅的化合物转化为水及无害气体,而氨的参与形式,是由尿素转变而成,尿素溶液经尿素喷嘴来实现尿素喷射雾化,雾化后的尿素雾形成极细小的均匀微粒,在适当的温度条件下迅速转化为氨气而参与到尾气的催化净化过程中,这个过程中的关键部件是尿素喷嘴,尿素喷嘴的精度要求非常高,达不到精度要求,在尿素喷雾中极易形成尿素结晶,堵塞喷嘴。目前该精密件只有德国博世公司、德国大陆公司、美国德尔福公司的产品才能做到精度要求,国产的尿素喷嘴由于孔的误差大,在喷射过程中经常雾化不均匀导致出现结晶现象。目前国家对尾气排放的要求越来越严格,2020年将要全面实现国六标准排放,时间越来越近,而高精密度喷嘴技术在短时间内又难以解决,因此,提供一种代替高精密度尿素喷嘴的装置,在柴油发动机的催化净化器中取代高精密度尿素喷嘴的使用,是催化净化技术的进步。经过检索,还未发现有除了尿素喷嘴外,其他使得尿素在催化净化器外汽化的装置的技术披露。
发明内容
本发明的目的在于提供一种SCR柴油发动机催化消声净化器尿素汽化装置,使得尿素能在催化净化器外汽化成均匀细小微粒,再以尿素气体形式进入催化净化器,克服传统尿素汽化所存在的需要精密喷嘴的不足,及易形成尿素结晶的不足。
为实现上述发明目的,本发明采取了下述的具体技术措施。一种SCR柴油发动机催化消声净化器尿素汽化装置,包括贮存尿素液的添蓝罐、输送尿素液的尿素输送管、汽化容器及气体喷口,所述添蓝罐为双层罐体结构,在罐体的两个侧面的外侧及底部分别设置有罐体左夹层、罐体右夹层和罐底夹层,罐体左夹层、罐体右夹层和罐底夹层相通,在罐体右夹层内安装尿素初级输送管,尿素初级输送管的出口端连接在添蓝罐液位传感器及温度传感器集成盖上,下端与液体输出管连接,液体输出管与设置在添蓝罐内部的过滤器连接,罐体右夹层上端设置有热水进口,罐体左夹层的上端设置有热水出口;所述尿素输送管包括尿素初级输送管和尿素次级输送管,尿素次级输送管的一端与尿素初级输送管连接,另一端通过气体喷口与催化净化器连接,中间还连接有计量泵;所述汽化容器是在计量泵至催化净化器这段尿素次级输送管上套装有陶瓷内管,在陶瓷内管外安装有电热丝,在电热丝上包裹有耐高温及绝缘保温棉,再用陶瓷外管套住保温棉,电热丝接入电源,通过能调整电压、电流的可控硅来调整温度。
采取上述措施的本发明,利用发动机冷却水的余热加热添蓝罐中的尿素液,发动机冷却水有恒温装置,通常维持在80-90℃,添蓝罐的表面积与空气接触有一定冷却作用,可以减少发动机散热电子扇使用频率,利用发动机热效来解决加热,去掉了原来传统的添蓝罐内的电加热器,节约电能从而有减少油耗作用。尿素液在尿素次级输送管中被汽化容器加热而汽化,尿素液成为了尿素气,实现了更好的稳定性,提高了在催化消声器中尿素与废气混合均匀程度,从而提高催化转化率,解决了因为喷嘴孔大小不一致导致喷雾颗粒过大,在快速气流中不能全部汽化导致的氨泄漏,同时也解决了经常出现的尿素结晶的老大难问题,摒弃了高精密度喷嘴的使用,从另一途径上解决了氨参与催化净化过程的技术瓶颈,带来了革命性的技术进步。
附图说明
图1是本发明结构示意图;
图2是本发明添蓝罐结构示意图;
图3是本发明添蓝罐另一实施方式的结构示意图;
图4是本发明汽化容器的结构示意图;
图5是本发明汽化容器的另一实施方式结构示意图;
图6是本发明汽化容器的涡流电加热方式结构示意图。
上述附图的序号说明:
添蓝罐1,罐体左夹层1-1、罐体右夹层1-2,罐底夹层1-3,添蓝罐液位传感器及温度传感器集成盖1-4,液体输出管1-5,过滤器1-6,热水进口1-7,热水出口1-8,夹层螺丝1-9,罐体加热管1-10,快拆螺纹盖1-11,管接接头1-12,
尿素输送管2,尿素初级输送管2-1,尿素次级输送管2-2,计量泵2-3;
汽化容器3,陶瓷内管3-1,电热丝3-2,保温棉3-3,陶瓷外管3-4,电涡流加热器3-5;
催化净化器4,气体喷口4-1,尾气进口段4-2。
具体实施方式
实施例1
如上述附图所示,本发明是一种参与催化净化器工作,在过程中把尿素液汽化为尿素气的汽化装置,包括贮存尿素液的添蓝罐1、输送尿素液的尿素输送管2、汽化容器3及催化净化器4。如图2所示的添蓝罐1是一种夹层结构,在罐体的两个侧面的外侧及底部分别设置有罐体左夹层1-1、罐体右夹层1-2和罐底夹层1-3,罐体左夹层1-1、罐体右夹层1-2和罐底夹层1-3相通,罐体右夹层1-2上端设置有热水进口1-7,罐体左夹层1-1的上端设置有热水出口1-8,从发动机出来的温度保持在80-90℃热水从热水进口1-7进入罐体右夹层1-2,经过罐底夹层1-3、罐体左夹层1-1从热水出口1-8排出,在罐体右夹层1-2内安装尿素初级输送管2-1,尿素初级输送管2-1的出口端连接在添蓝罐液位传感器及温度传感器集成盖1-4上,下端与液体输出管1-5连接,液体输出管1-5与设置在添蓝罐内部的过滤器1-6连接,热水通过罐体左夹层1-1、罐体右夹层1-2和罐底夹层1-3,把添蓝罐1中的尿素液加热,加热后的尿素液从安装在添蓝罐1底部的过滤器1-6中过滤,从液体输出管1-5中进入尿素初级输送管2-1,在罐体右夹层1-2中得到再次加热,从尿素初级输送管2-1进入尿素次级输送管2-2的尿素液温度接近了80-90℃,为尿素液汽化打下基础。所述尿素输送管2包括尿素初级输送管2-1和尿素次级输送管2-2,尿素次级输送管2-2的一端与尿素初级输送管2-1连接,另一端通过气体喷口4-1与催化净化器4连接,中间还连接有计量泵2-3;在计量泵2-3至催化净化器4-1这段尿素次级输送管2-2上设置有汽化容器3如图4所示,所述汽化容器3是在尿素次级输送管2-2上套装有陶瓷内管3-1,在陶瓷内管3-1外安装有电热丝3-2,在电热丝3-2上包裹有耐高温的绝缘保温棉层3-3,再用陶瓷外管3-4套住保温棉层3-3,电热丝3-2接入电源进入能调整电压、电流的可控硅,通过调整电压、电流来调整温度。这样,从尿素初级输送管2-1出来的经过夹层中热水加热的尿素液,温度接近了80-90℃,流入尿素次级输送管2-2经过计量泵2-3计量,再次流入尿素次级输送管2-2的末段,在这里被汽化容器3进一步加热而汽化,尿素液在加热情况下变为尿素气的状态,从气体喷口4-1进入催化净化器4,参与催化净化器4的工作。
实施例2
在本实施例中添蓝罐1的结构如图3所示,在罐体的底部设置有罐底夹层1-3,在罐体的左侧面也设置有罐体左夹层1-1,罐体左夹层1-1上端设置有热水出口1-8,罐体左夹层1-1相对的右侧面通过螺丝连接的方式连接有罐体加热管1-10,罐体加热管1-10下端通过夹层螺丝1-9与添蓝罐1的罐底夹层1-3连接,上端管侧面设置有热水进水口1-7,端口处通过快拆螺纹盖1-11密封,中间设置有尿素初级输送管2-1,尿素初级输送管2-1的下端通过管接接头1-12与添蓝罐1的液体输出管1-5连接,上端穿过快拆螺纹盖1-11伸出与次级尿素输送管2-2相接,添蓝罐1的底部设置有过滤器1-6,过滤器1-6与液体输出管1-5连接。这样,从发动机出来的热水从热水进口1-7进入罐体加热管1-10,流入罐底夹层1-3,从罐体左夹层1-1上端的热水出口1-8排出,热水通过罐体左夹层1-1和罐底夹层1-3,把添蓝罐1中的尿素液加热,加热后的尿素液从安装在添蓝罐1底部的过滤器1-6中过滤,从液体输出管1-5中进入尿素初级输送管2-1,在罐体加热管1-10得到再次加热,从尿素初级输送管2-1进入尿素次级输送管2-2的尿素液温度接近了80-90℃,为尿素液汽化打下基础。
本实施例所述汽化容器3如图5所示,汽化容器3设置在催化净化器4的尾气进口段4-2,汽化容器3呈圆周状包裹着尾气进口段4-2,尿素输送管出口1-13与气体喷口4-1相对错位设置,从发动机出来的热尾气进入催化净化器4时,首先将尾气进口段4-2加热,再通过尾气进口段4-2将汽化容器3加热,这样,从尿素初级输送管2-1出来的经过夹层中热水加热的尿素液,温度接近了80-90℃,流入尿素次级输送管2-2经过计量泵2-3计量,再次流入尿素次级输送管2-2的末段,并从尿素输送管出口1-13进入汽化容器3中,在这里被汽化容器3进一步加热而汽化,尿素液在加热情况下变为尿素气的状态,从错位设置的气体喷口4-1进入催化净化器4,参与催化净化器4的工作。
实施例3
1.在本实施例中汽化容器3如图6所示,根据法拉第电磁感应定律,金属导体置于变化的磁场中时,导体的表面就会有感应电流产生。电流的流线在金属体内自行闭合,这种由电磁感应原理产生的漩涡状感应电流称为电涡流,这种现象称为电涡流效应。假如导体是金属的,则由于电阻很小,产生的涡电流很大,电流的热效应可以使金属的温度达到很高的程度。根据这一原理,本实施例在计量泵2-3至催化净化器4-1这段尿素次级输送管2-2上设置有汽化容器3,汽化容器3采用电涡流加热器3-5加热的方式,将尿素次级输送管2-2从电涡流加热器3-5中间穿过,给电涡流加热器3-5接入交变电流,通过电涡流的方式给电涡流加热器3-5加热,从而将流经尿素次级输送管2-2的尿素液加热汽化成尿素气体,从气体喷口4-1进入催化净化器,参与催化净化器4的工作。
Claims (4)
1.一种SCR柴油发动机催化消声净化器尿素汽化装置 ,包括贮存尿素液的添蓝罐(1)、输送尿素液的尿素输送管(2)、汽化容器(3)及气体喷口(4-1),其特征在于所述添蓝罐(1)为双层罐体结构,在罐体的两个侧面的外侧及底部分别设置有罐体左夹层(1-1)、罐体右夹层(1-2)和罐底夹层(1-3),罐体左夹层(1-1)、罐体右夹层(1-2)和罐底夹层(1-3)相通,在罐体右夹层(1-2)内安装尿素初级输送管(2-1),尿素初级输送管(2-1)的出口端连接在添蓝罐液位传感器及温度传感器集成盖(1-4)上,下端与液体输出管(1-5)连接,液体输出管(1-5)与设置在添蓝罐(1)内部的过滤器(1-6)连接,罐体右夹层(1-2)上端设置有热水进口(1-7),罐体左夹层(1-1)的上端设置有热水出口(1-8);所述尿素输送管(2)包括尿素初级输送管(2-1)和尿素次级输送管(2-2),尿素次级输送管(2-2)的一端与尿素初级输送管(2-1)连接,另一端通过气体喷口(4-1)与催化净化器(4)连接,中间还连接有计量泵(2-3);所述汽化容器(3)是在计量泵(2-3)至催化净化器(4)这段尿素次级输送管(2-2)上套装有陶瓷内管(3-1),在陶瓷内管(3-1)外安装有电热丝(3-2),在电热丝(3-2)上包裹有耐高温的绝缘保温棉(3-3),再用陶瓷外管(3-4)套住保温棉(3-3),电热丝(3-2)接入电源,通过能调整电压、电流的可控硅来调整温度。
2.根据权利要求1所述的一种SCR柴油发动机催化消声净化器尿素汽化装置,其特征在于所述添蓝罐(1)在罐体的底部设置有罐底夹层(1-3),在罐体的左侧面也设置有罐体左夹层(1-1),罐体左夹层(1-1)上端设置有热水出口(1-8),罐体左夹层(1-1)相对的右侧面通过螺丝连接的方式连接有罐体加热管(1-10),罐体加热管(1-10)下端通过夹层螺丝(1-9)与添蓝罐(1)的罐底夹层(1-3)连接,上端管侧面设置有热水进水口(1-7),端口处通过快拆螺纹盖(1-11)密封,中间设置有尿素初级输送管(2-1),尿素初级输送管(2-1)的下端通过管接接头(1-12)与添蓝罐(1)的液体输出管(1-5)连接,上端穿过快拆螺纹盖(1-11)伸出与次级尿素输送管(2-2)相接,添蓝罐(1)的底部设置有过滤器(1-6),过滤器(1-6)与液体输出管(1-5)连接。
3.根据权利要求1所述的一种SCR柴油发动机催化消声净化器尿素汽化装置,其特征在于汽化容器(3)设置在催化净化器(4)的尾气进口段(4-2),汽化容器(3)呈圆周状包裹着尾气进口段(4-2),尿素输送管出口(1-13)与气体喷口(4-1)相对错位设置。
4.根据权利要求1所述的一种SCR柴油发动机催化消声净化器尿素汽化装置,其特征在于汽化容器(3)采用电涡流加热器(3-5)加热的方式,将尿素次级输送管(2-2)从电涡流加热器(3-5)中间穿过,给电涡流加热器(3-5)接入交变电流,通过电涡流的方式给电涡流加热器(3-5)加热。
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