CN109458245B - 一种利用汽车尾气温差发电提升scr转化效率的系统 - Google Patents
一种利用汽车尾气温差发电提升scr转化效率的系统 Download PDFInfo
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Abstract
本发明公开了一种利用汽车尾气温差发电提升SCR转化效率的系统,包括汽车尾气温差发电装置和排气加热装置,汽车尾气温差发电装置包括蓄电池、稳压电路、MPPT、温差发电片、冷却水管道、冷却水箱,排气加热装置包括电阻丝网、蓄电池、温度传感器、ECU;该系统以低品位的汽车尾气为热源,采用循环水对温差发电片的冷端进行冷却,采用稳压电路进行稳压,电阻丝网由蓄电池供电并对排气进行加热,提高SCR系统进气温度。本发明针对低温排气工况和低温环境下使用,提高排气温度,促进尿素水解,提升SCR系统低温工况转化效率,减少汽车有害气体排放。
Description
技术领域
本发明涉及汽车尾气余热的利用和尾气后处理技术领域,具体为利用汽车尾气和冷却水之间温差不间断发电并存储,利用该能量在管道中对排气进行加热,从而促进尿素热解,提高SCR转化率。
背景技术
在汽车工业快速发展带给人们舒适、便捷的同时,日益严重的能源紧张问题和尾气污染也日益凸显。在汽车发动机工作过程中约有30%-40%的能量随尾气排放到大气中,同时产生NOx等有害气体,造成能源浪费和环境污染。近年来,石油产量的下降和排放法规的不断严格对发动机能源利用效率和NOx排放的控制提出了更高的要求。温差发电技术可以有效利用汽车尾气低品位能源、提高排气温度,提高SCR转化率,减少汽车有害污染物排放。
发动机处于不同运行工况和过渡工况时,温差发电片所产生电压、电流不稳定,需要使用DC-DC稳压电路,将不稳定电压、电流转化为稳定电压、电流输出。同时也可以对蓄电池起到保护作用,延长蓄电池使用寿命。
汽车使用环境不大相同,当汽车低温运行时,冷却水可能结冰,且SCR系统处于低温工况时,排气温度较低,尿素不易分解,在管道内形成结晶,降低NOx转化率,无法有效减少汽车有害污染物排放。通过对排气加热,提高排气温度,将有效促进尿素热解,减少结晶形成,提高SCR在低温环境和低温工况下的转化率,有效减少汽车尾气污染物排放。
发明内容
本发明旨在提供一种利用汽车尾气温差发电、并在低温环境和低温工况下对排气进行电加热的加热系统。本发明利用汽车尾气余热进行温差发电,不需要额外对系统内加热装置供电,可有效解决SCR系统在低温环境和低温工况时,排气温度低、尿素喷雾易形成结晶、尿素热解率低和NOx转化率低等问题。
为实现上述目的,本发明提供了如下技术方案:
一种利用汽车尾气温差发电提升SCR转化效率的系统,包括汽车尾气温差发电装置和排气加热装置,汽车尾气温差发电装置包括蓄电池、温差发电片和冷却水管道,排气加热装置包括电阻丝网、蓄电池、电子控制单元和温度传感器;所述电阻丝网依次与蓄电池电子控制单元和温度传感器连接,电阻丝网设于排气管道内部的混合器前端,温度传感器伸入排气管道内部;所述蓄电池还与双层结构的温差发电片相连,温差发电片沿排气管道轴向等距离紧密贴合在排气管道上,温差发电片外侧安装双层冷却水管道,冷却水管道与冷却水箱相连。
上述方案中,所述双层结构的温差发电片包括第一、二层温差发电片,第一层温差发电片位于第二层温差发电片内侧,且第一层温差发电片的工作温度高于第二层温差发电片;所述双层冷却水管道内层安装在第二层温差发电片的外侧,冷却水管道的外层为两端盖封闭且开有进、出口的管道,两端盖分别固定有若干隔板,隔板的长度小于冷却水管道外层的长度,两侧的隔板交错布置。
上述方案中,所述蓄电池与温差发电片之间连接有稳压电路,所述稳压电路与温差发电片之间连接有最大功率点示踪器。
上述方案中,所述温差发电片为环形发电片,材料为Bi2Te3。
上述方案中,所述冷却水箱中添加有防冻液。
上述方案中,所述冷却水管道两端使用固定机构固定,防止冷却水管道移动,所述固定机构为法兰盘,并对法兰盘的突出部分进行焊接。
本发明的有益效果为:
1)环形温差发电片沿排气管道轴向等距离(5cm)排列,并紧密贴合于排气管道上,以便充分利用排气管道余热。
2)温差发电片为双层结构,且第一层温差发电片的工作温度高于第二层温差发电片,提高能量利用效率。
3)冷却水管道的外层为两端盖封闭且开有进、出口的管道,两端盖分别固定有隔板,两侧的隔板交错布置,有利于冷却水带走温差发电片冷端热量,降低冷端温度,提高发电效率。
4)电阻丝网对排气进行加热,提高排气温度从而促进尿素分解,有效避免了尿素在低温环境下易形成结晶的问题。
5)电子控制单元和温度传感器结合使用,智能控制蓄电池对电阻丝网供电,避免了蓄电池内电能的浪费。
6)固定机构为带有突出结构的法兰盘,其突出结构便于焊接。
附图说明
图1为本发明所述汽车尾气温差发电提升SCR转化效率的系统结构示意图;
图2为本发明的排气管道结构示意图;
图3为本发明的冷却水管道内部结构示意图。
图中:1-排气管道;2-电阻丝网;3-蓄电池;4-混合器;5-DC-DC稳压电路;6-最大功率点示踪器;7-温差发电片;8-固定机构;9-冷却水管道;10-冷却水箱;11-电子控制单元;12-温度传感器。
具体实施方式
下面结合附图对本发明的具体实施方案进一步说明。
如图1所示,一种利用汽车尾气温差发电提升SCR转化效率的系统,该系统包括两套装置:汽车尾气温差发电装置和排气加热装置,汽车尾气温差发电装置包括环形温差发电片7(材料为Bi2Te3)、温差发电片固定机构8、冷却水箱10、冷却水管道9、DC-DC稳压电路5、蓄电池3、最大功率点示踪器6(MPPT),排气加热装置包括电阻丝网2、蓄电池3、电子控制单元11(ECU89661-0Z230/0Z240)、温度传感器12。
排气管道1前端的内部设有混合器4,混合器4的前端、尿素喷嘴的后端通过焊接方式固定电阻丝网2,电阻丝网2通过导线依次与蓄电池3、电子控制单元11、温度传感器12连接,温度传感器12安装时伸入排气管道1内部,监测排气温度,实时向电子控制单元11反馈,电子控制单元11对蓄电池3输出的开启和关闭起到控制作用,当温度低于临界温度300℃时,启动排气加热装置,对排气进行加热。
蓄电池3还依次与DC-DC稳压电路5、最大功率点示踪器6、温差发电片7通过导线连接,温差发电片7沿排气管道轴向等距离(5cm)间隔紧密贴合在排气管道1上,温差发电片7为双层结构,第一层温差发电片紧密贴合在在排气管道1上,第一层温差发电片外侧依次安装有第二层温差发电片、冷却水管道9,冷却水管道9两端使用固定机构8(法兰盘)固定,并对法兰盘的突出部分进行焊接,防止冷却水管道9移动,如图2所示;第一层温差发电片的工作温度高于第二层温差发电片,以充分利用汽车尾气余热。冷却水管道9与冷却水箱10相连,温差发电装置冷端采用循环水进行冷却,冷却水由冷却水箱10流入冷却水管道9对温差发电片7冷端进行冷却。
如图3所示,冷却水管道9为双层管道,内层安装在温差发电片7的外侧,冷却水管道9的外层为两端盖封闭且开有进、出口的管道,两端盖分别固定有若干隔板3-1,隔板3-1的长度小于冷却水管道9外层的长度,两侧的隔板3-1交错布置,使冷却水按照“之”字形的线路进行流通,和温差发电片7进行更加有效的换热,有效降低温差发电片7的冷端温度,提高温差发电片7两端温差;冷却水箱10中添加有防冻液,防止低温环境下冷却水结冰;最大功率示踪器6可使温差发电片7始终保持最大功率输出;发动机工况的不稳定导致温差发电片7的输出电压、电流不稳定,在蓄电池3前加设DC-DC稳压电路5,使输出电压、电流稳定。
电阻丝网2将蓄电池3传递的电能转化为热能对排气进行加热,提高排气温度,有效改善尿素雾化效果、提高尿素热解率、减少结晶、提高SCR转化率和减少汽车尾气污染物排放。
工作过程:
温差发电片7将排气管处热能转化为电能,通过最大功率示踪器6使温差发电片7始终以最大功率发电,利用DC-DC稳压电路5将温差发电片输出电压、电流进行稳压稳流后输入蓄电池3,温度传感器12实时监测排气管道1进口处温度,电子控制单元11接收温度传感器12的信号,当温度低于300℃时,电子控制单元11控制蓄电池3对电阻丝网2供电,电阻丝网2将蓄电池3内存储的电能转化为热能,从而对排气加热提高排气温度,促进尿素在排气管道1内的热解,通过减少尿素在排气管道1内的结晶达到提升SCR系统的转化效率的目的。
以上依据图示的实施例详解说明了本发明的构造、特征及作用效果,以上所述仅为本发明的较佳实施例,但本发明不以图面所示限定实施范围,凡是依照本发明的构想所做的改变,或者修改为等同变化的等效实施例,仍未超出说明书与图示所涵盖的精神时,均应在本发明的保护范围内。
Claims (6)
1.一种利用汽车尾气温差发电提升SCR转化效率的系统,其特征在于,包括汽车尾气温差发电装置和排气加热装置,汽车尾气温差发电装置包括蓄电池(3)、温差发电片(7)和冷却水管道(9),排气加热装置包括电阻丝网(2)、蓄电池(3)、电子控制单元(11)和温度传感器(12);
所述电阻丝网(2)依次与蓄电池(3)电子控制单元(11)和温度传感器(12)连接,电阻丝网(2)设于排气管道(1)内部的混合器(4)前端,温度传感器(12)伸入排气管道(1)内部;
所述蓄电池(3)还与双层结构的温差发电片(7)相连,温差发电片(7)沿排气管道轴向等距离紧密贴合在排气管道(1)上,温差发电片(7)外侧安装双层冷却水管道(9),冷却水管道(9)与冷却水箱(10)相连;
所述双层结构的温差发电片(7)包括第一、二层温差发电片,第一层温差发电片位于第二层温差发电片内侧,第一层温差发电片紧密贴合在在排气管道(1)上,且第一层温差发电片的工作温度高于第二层温差发电片;
所述温差发电片(7)为环形发电片,材料为Bi2Te3;
所述双层冷却水管道(9)内层安装在第二层温差发电片的外侧,冷却水管道(9)的外层为两端盖封闭且开有进、出口的管道,两端盖分别固定有若干隔板(3-1),隔板(3-1)的长度小于冷却水管道(9)外层的长度,两侧的隔板(3-1)交错布置。
2.如权利要求1所述一种利用汽车尾气温差发电提升SCR转化效率的系统,其特征在于,所述蓄电池(3)与温差发电片(7)之间连接有稳压电路(5)。
3.如权利要求2所述一种利用汽车尾气温差发电提升SCR转化效率的系统,其特征在于,所述稳压电路(5)与温差发电片(7)之间连接有最大功率点示踪器(6)。
4.如权利要求1所述一种利用汽车尾气温差发电提升SCR转化效率的系统,其特征在于,所述冷却水箱(10)中添加有防冻液。
5.如权利要求1所述一种利用汽车尾气温差发电提升SCR转化效率的系统,其特征在于,所述冷却水管道(9)两端使用固定机构(8)固定,防止冷却水管道(9)移动。
6.如权利要求5所述一种利用汽车尾气温差发电提升SCR转化效率的系统,其特征在于,所述固定机构(8)为法兰盘,并对法兰盘的突出部分进行焊接。
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