CN102691553A - Air-assisting type SCR (Selective Catalyst Reaction) system - Google Patents
Air-assisting type SCR (Selective Catalyst Reaction) system Download PDFInfo
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- CN102691553A CN102691553A CN2012101943507A CN201210194350A CN102691553A CN 102691553 A CN102691553 A CN 102691553A CN 2012101943507 A CN2012101943507 A CN 2012101943507A CN 201210194350 A CN201210194350 A CN 201210194350A CN 102691553 A CN102691553 A CN 102691553A
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- 239000003054 catalyst Substances 0.000 title claims description 3
- 238000006243 chemical reaction Methods 0.000 title description 2
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000004202 carbamide Substances 0.000 claims abstract description 69
- 230000003197 catalytic effect Effects 0.000 claims abstract description 19
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 9
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 239000000498 cooling water Substances 0.000 claims abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000007788 liquid Substances 0.000 claims description 2
- 239000007789 gas Substances 0.000 description 13
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 239000007864 aqueous solution Substances 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 239000007921 spray Substances 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 238000010531 catalytic reduction reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006722 reduction reaction Methods 0.000 description 1
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/40—Engine management systems
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- Exhaust Gas After Treatment (AREA)
Abstract
本发明公开的一种气助式SCR系统，包括尿素箱、尿素供给单元、喷嘴、车载压缩空气源、催化器、控制单元ACU，尿素箱和车载压缩空气源通过管路连接尿素供给单元，尿素箱另一端连接冷却水进水管路和冷却水回水管路，尿素供给单元另一侧连接喷嘴，喷嘴正对汽车尾气排放管道，催化器安装在汽车尾气排放管道上,汽车尾气排放管道上催化器的上游安装了排气温度传感器和NOX传感器，排气温度传感器、NOX传感器、环境温度传感器、发动机CAN总线、尿素箱、尿素箱前的进水管路上的阀、尿素供给单元与控制单元ACU电连接，尿素供给单元由尿素进液管路、尿素喷射管路、进气管路三段管路组成。本发明可降低系统使用成本，增长系统寿命。
A gas-assisted SCR system disclosed in the present invention includes a urea tank, a urea supply unit, a nozzle, a vehicle-mounted compressed air source, a catalytic converter, and a control unit ACU. The urea tank and the vehicle-mounted compressed air source are connected to the urea supply unit through pipelines. The other end of the tank is connected to the cooling water inlet pipe and the cooling water return pipe. The other side of the urea supply unit is connected to the nozzle. The nozzle is facing the automobile exhaust pipe. The catalytic converter is installed on the automobile exhaust pipe. The exhaust gas temperature sensor and NO X sensor are installed upstream, the exhaust gas temperature sensor, NO X sensor, ambient temperature sensor, engine CAN bus, urea tank, valve on the water inlet pipeline before the urea tank, urea supply unit and control unit ACU Electrically connected, the urea supply unit is composed of three sections of urea inlet pipeline, urea injection pipeline and air intake pipeline. The invention can reduce system use cost and prolong system life.
Description
技术领域 technical field
本发明涉及机动车尾气排放控制技术领域，特别是涉及一种用于柴油汽车尾气排放控制的气助式SCR系统。 The invention relates to the technical field of motor vehicle exhaust emission control, in particular to an air-assisted SCR system used for diesel vehicle exhaust emission control.
背景技术 Background technique
SCR是指安装在柴油汽车排气系统中，将柴油机排放中的NOx催化还原成N2和O2的催化还原装置，选择尿素水溶液作为还原剂。尿素水溶液喷射到催化剂上游的排气管中，在废气温度和气流的作用下水解产生为CO2和氨气，氨气作为还原剂将NOx还原成无污染的氮气和水。尿素溶液必须根据发动机工况定量喷射，所以尿素喷射系统需要与发动机控制单元通讯。SCR的工作效率取决于气体温度，通常气排温达到250 0C以上NOx转化效率可达到85%以上。 SCR refers to a catalytic reduction device installed in the exhaust system of diesel vehicles to catalytically reduce NOx in diesel engine emissions into N2 and O2, and urea aqueous solution is selected as the reducing agent. Urea aqueous solution is injected into the exhaust pipe upstream of the catalyst, and under the action of exhaust gas temperature and air flow, it is hydrolyzed into CO2 and ammonia, and ammonia acts as a reducing agent to reduce NOx into pollution-free nitrogen and water. The urea solution must be injected quantitatively according to the engine operating conditions, so the urea injection system needs to communicate with the engine control unit. The working efficiency of SCR depends on the gas temperature. Usually, the NOx conversion efficiency can reach more than 85% when the exhaust gas temperature reaches above 250 ℃.
目前，国内的柴油机生产企业应对即将到来的排放法规国IV及更高阶段减排技术路线都以已明确，SCR是一种高效、实用的机动车排放控制技术。即SCR技术路线是中重型柴油机达到第Ⅳ阶段排放标准的最佳选择。 At present, the domestic diesel engine manufacturers have clearly defined the emission reduction technology route for the upcoming emission regulations of China IV and higher stages. SCR is an efficient and practical motor vehicle emission control technology. That is to say, the SCR technology route is the best choice for medium and heavy-duty diesel engines to meet the emission standards of Stage IV.
发明内容 Contents of the invention
本发明所要解决的技术问题在于针对上述现有技术中的需要而设计的一种气助式SCR系统，这种气助式SCR系统的尿素供给单元无需尿素回流管路，可降低系统使用成本和系统使用寿命长。并且排气温度传感器或放置在催化器上游或放置在催化器下游，对于排放控制无影响，便于整车安装布置。 The technical problem to be solved by the present invention is a kind of air-assisted SCR system designed for the above-mentioned needs in the prior art. The urea supply unit of this air-assisted SCR system does not need a urea return pipeline, which can reduce the system use cost and The system has a long service life. And the exhaust gas temperature sensor is placed either upstream of the catalytic converter or downstream of the catalytic converter, which has no effect on emission control and is convenient for installation and arrangement of the whole vehicle.
本发明所要求解决的技术问题可以通过以下技术方案来实现： The technical problem required to be solved by the present invention can be realized by the following technical solutions:
一种气助式SCR系统，包括尿素箱、尿素供给单元、喷嘴、车载压缩空气源、催化器、控制单元ACU，所述尿素箱和车载压缩空气源通过管路连接尿素供给单元，尿素箱另一端还连接冷却水进水管路和冷却水回水管路，所述尿素供给单元另一侧还连接喷嘴，所述喷嘴正对汽车尾气排放管道，所述催化器安装在汽车尾气排放管道上并与该管道相通, 所述汽车尾气排放管道上催化器的上游安装了排气温度传感器和NOX传感器，排气温度传感器、NOX传感器、环境温度传感器、发动机CAN总线、尿素箱、尿素箱前的进水管路上的阀、尿素供给单元与控制单元ACU电连接，所述尿素供给单元由尿素进液管路、尿素喷射管路、进气管路三段管路组成。 An air-assisted SCR system, including a urea tank, a urea supply unit, a nozzle, a vehicle-mounted compressed air source, a catalytic converter, and a control unit ACU. The urea tank and the vehicle-mounted compressed air source are connected to the urea supply unit through pipelines, and the urea tank One end is also connected to the cooling water inlet pipeline and the cooling water return pipeline, the other side of the urea supply unit is also connected to the nozzle, the nozzle is facing the automobile exhaust pipe, and the catalytic converter is installed on the automobile exhaust pipe and connected with The pipes are connected, and the exhaust gas temperature sensor and the NOx sensor are installed upstream of the catalytic converter on the automobile exhaust emission pipe, the exhaust temperature sensor, the NOx sensor, the ambient temperature sensor, the engine CAN bus, the urea tank, and the front of the urea tank The valve on the water inlet pipeline and the urea supply unit are electrically connected to the control unit ACU, and the urea supply unit is composed of a urea inlet pipeline, a urea injection pipeline, and an air intake pipeline.
所述排气温度传感器也能位于催化器下游。 The exhaust gas temperature sensor can also be located downstream of the catalytic converter.
所述尿素箱、车载压缩空气源与尿素供给单元间的管路上均安装有滤清器。 Filters are installed on the pipelines between the urea tank, the vehicle-mounted compressed air source and the urea supply unit.
由于采用了如上技术方案，本发明具有如下特点：尿素供给单元没有尿素回流管路，可降低系统使用成本；排气温度传感器可布置在催化器的上游或下游，对于排放控制无影响，便于整车安装布置。 Due to the adoption of the above technical solution, the present invention has the following features: the urea supply unit has no urea return pipeline, which can reduce the system use cost; the exhaust gas temperature sensor can be arranged upstream or downstream of the catalytic converter, which has no effect on emission control and is convenient for the whole process. Car installation layout.
附图说明 Description of drawings
图1为本发明系统结构框图。 Fig. 1 is a block diagram of the system structure of the present invention.
具体实施方式 Detailed ways
为了使本发明实现的技术手段、创作特征、达成目的与功效易于明白了解，下面结合具体图示，进一步阐述本发明。 In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further described below in conjunction with specific illustrations.
如图1所示，本发明主要由尿素箱、尿素供给单元、喷嘴、催化器、控制单元ACU、车载压缩气源和相应的连接管路等组成。尿素箱和车载压缩气源与尿素供给单元通过管路连接，尿素供给单元前连有喷嘴，喷嘴正对汽车尾气排放管道，汽车尾气排放管道上还安装了催化器，汽车尾气排放管道上催化器的上游还安装了排气温度传感器和NOX传感器，排气温度传感器还可以安装在催化器下游。排气温度传感器、NOX传感器、环境温度传感器、尿素箱、尿素箱前的冷却水进水阀、尿素供给单元、发动机CAN总线都与控制单元ACU电连接，以便受控制单元ACU控制。尿素供给单元由尿素进液管路、尿素喷射管路、进气管路组成。 As shown in Figure 1, the present invention is mainly composed of a urea tank, a urea supply unit, a nozzle, a catalytic converter, a control unit ACU, a vehicle-mounted compressed air source and corresponding connecting pipelines. The urea tank and the vehicle-mounted compressed air source are connected to the urea supply unit through pipelines. There is a nozzle in front of the urea supply unit. An exhaust temperature sensor and a NOx sensor are also installed upstream of the exhaust gas temperature sensor, and the exhaust temperature sensor can also be installed downstream of the catalytic converter. The exhaust temperature sensor, NO X sensor, ambient temperature sensor, urea tank, cooling water inlet valve in front of the urea tank, urea supply unit, and engine CAN bus are all electrically connected to the control unit ACU so as to be controlled by the control unit ACU. The urea supply unit consists of a urea inlet pipeline, a urea injection pipeline, and an air intake pipeline.
发动机工作，尾气通过催化器，当排气温度达到2000摄氏度以上且NOx排放超标，系统开始工作。其中温度传感器和NOx传感器及发动机CAN总线得到数据反馈给控制单元ACU，控制单元ACU通过自身传感器及CAN总线获得各种信息，根据发动机工况，经过内部的计算，得出需要的尿素水溶液喷射量，并精确控制计量泵进行喷射；将其信号发给尿素供给单元，尿素供给单元内部计量泵进行喷射；尿素供给单元将其尿素水溶液与车载压缩空气混合后通过喷射管路到达尿素喷嘴，通过尿素喷嘴雾化喷射到催化器上游排气管内与尾气混合后进入催化器，通过催化器的作用将其NOx分解还原。 The engine is working, the exhaust gas passes through the catalytic converter, and the system starts to work when the exhaust gas temperature exceeds 2000 degrees Celsius and the NOx emission exceeds the standard. Among them, the temperature sensor, NOx sensor and engine CAN bus get data feedback to the control unit ACU. The control unit ACU obtains various information through its own sensor and CAN bus. According to the engine working conditions, through internal calculation, the required urea aqueous solution injection volume is obtained. , and accurately control the metering pump to spray; send the signal to the urea supply unit, and the internal metering pump of the urea supply unit will spray; The nozzle atomizes and sprays into the exhaust pipe upstream of the catalytic converter, mixes with the exhaust gas and enters the catalytic converter, and decomposes and reduces its NOx through the action of the catalytic converter.
与同类气助式SCR系统方案比较： Compared with similar air-assisted SCR system solutions:
1）本发明气助式SCR系统方案中无需尿素回流管路。本发明气助式SCR尿素供给单元含有:尿素进液管路、尿素喷射管路、进气管路。其他同类产品有:尿素进液管路、尿素喷射管路、尿素回流管路、进气管路。 1) The air-assisted SCR system scheme of the present invention does not require a urea return pipeline. The gas-assisted SCR urea supply unit of the present invention comprises: a urea liquid inlet pipeline, a urea injection pipeline, and an air intake pipeline. Other similar products include: urea inlet pipeline, urea injection pipeline, urea return pipeline, air intake pipeline. the
2）与市场同类产品相比，无需尿素回流管路。可降低系统使用成本和系统使用寿命长的优点。 2) Compared with similar products in the market, no urea return pipeline is required. It can reduce the cost of system use and the advantages of long service life of the system.
3）排气温度传感器布置位置可选； 3) The layout position of the exhaust gas temperature sensor is optional;
根据客户要求，可布置在催化器的上游或下游，对于排放控制无影响，便于整车安装布置。 According to customer requirements, it can be arranged upstream or downstream of the catalytic converter, which has no effect on emission control and is convenient for vehicle installation and arrangement.
以上显示和描述了本发明的基本原理、主要特征和本发明的优点。本行业的技术人员应该了解，本发明不受上述实施例的限制，上述实施例和说明书中描述的只是说明本发明的原理，在不脱离本发明精神和范围的前提下本发明还会有各种变化和改进，这些变化和改进都落入要求保护的本发明范围内。本发明要求保护范围由所附的权利要求书及其等同物界定。 The basic principles, main features and advantages of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments, and that described in the above-mentioned embodiments and the description only illustrates the principles of the present invention, and the present invention also has various aspects without departing from the spirit and scope of the present invention. Variations and improvements all fall within the scope of the claimed invention. The protection scope of the present invention is defined by the appended claims and their equivalents.
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| CN105626215A (en) * | 2014-10-27 | 2016-06-01 | 金有纯 | Device for regulating and controlling actual supply amount of urea entering exhaust system and regulating and controlling method |
| CN106837490A (en) * | 2017-03-30 | 2017-06-13 | 凯德斯环保科技（烟台）有限公司 | A kind of auxiliary formula urea injection apparatus of the gas for emptying |
| CN107420164A (en) * | 2017-04-28 | 2017-12-01 | 东风商用车有限公司 | Urea injection system with external urea nozzle air cooling branch and application method |
| CN112343694A (en) * | 2019-08-08 | 2021-02-09 | 无锡恒和环保科技有限公司 | Gas-assisted urea injection metering device for SCR system |
| CN113232243A (en) * | 2021-01-16 | 2021-08-10 | 温州南冠机械有限公司 | SCR denitration catalyst production mold and production method thereof |
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| CN113232243B (en) * | 2021-01-16 | 2022-12-06 | 温州南冠机械有限公司 | SCR denitration catalyst production mold and production method thereof |
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Application publication date: 20120926 |