本文關(guān)鍵詞：采用EGR結(jié)合高壓噴射技術(shù)實(shí)現(xiàn)柴油機(jī)低排放的實(shí)驗(yàn)研究　出處：《天津大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 柴油機(jī) 國四排放 EGR 高壓噴射 無后處理

【摘要】：日益嚴(yán)格的排放法規(guī)給柴油機(jī)技術(shù)不斷提出新的挑戰(zhàn)。我國的發(fā)動(dòng)機(jī)企業(yè)前期將采用SCR作為中、重型柴油機(jī)滿足國IV排放的首選路線。隨著對(duì)各技術(shù)路線認(rèn)識(shí)的深入,采用EGR+DPF的排放控制技術(shù)逐漸受到重視。但是SCR,DPF等高效的后處理裝置存在價(jià)格昂貴、結(jié)構(gòu)復(fù)雜、壽命短、維護(hù)困難等問題,因此需要通過機(jī)內(nèi)凈化盡量降低柴油機(jī)原始排放來減輕對(duì)后處理的依賴。在這種形勢下,本文針對(duì)WP7柴油機(jī)的無后處理排放問題,采用結(jié)合EGR和高壓噴射技術(shù),對(duì)WP7發(fā)動(dòng)機(jī)的結(jié)構(gòu)進(jìn)行優(yōu)化和選型,同時(shí)基于實(shí)驗(yàn),對(duì)發(fā)動(dòng)機(jī)的工作狀態(tài)進(jìn)行標(biāo)定和優(yōu)化,探索無后處理達(dá)到國四技術(shù)路線可行性。本課題針對(duì)WP7.300E408柴油機(jī)進(jìn)行了結(jié)構(gòu)的優(yōu)化,對(duì)于發(fā)動(dòng)機(jī)的噴油器、燃燒室、氣缸蓋、EGR冷卻器、增壓器等部件進(jìn)行了選型,選擇ESC排放循環(huán)中的A100、B100、C100、B50、C50五個(gè)點(diǎn)進(jìn)行DOE選型,根據(jù)各個(gè)部件的排放表現(xiàn)確定最終實(shí)驗(yàn)部件。根據(jù)排放要求,確定各個(gè)標(biāo)定參數(shù)范圍后進(jìn)行DOE設(shè)計(jì),并進(jìn)行臺(tái)架自動(dòng)標(biāo)定,可以大大減少部件選型實(shí)驗(yàn)實(shí)驗(yàn)工作量,加快實(shí)驗(yàn)進(jìn)程。進(jìn)行了ESC、ELR、ETC排放標(biāo)定,由于本項(xiàng)目是無后處理國四,為了滿足排放要求,軌壓標(biāo)定的都較高,主噴提前角在排放區(qū)都很小基本在5 deg以下。同時(shí)后噴只在排放區(qū)域開啟,在非排放區(qū)不使用后噴。對(duì)發(fā)動(dòng)機(jī)的性能及排放結(jié)果進(jìn)行外特性、萬有特性及排放實(shí)驗(yàn),對(duì)發(fā)動(dòng)機(jī)的性能及排放進(jìn)行驗(yàn)證。實(shí)驗(yàn)結(jié)果顯示,無后處理路線可以達(dá)到國四排放要求并有一定的余量。通過實(shí)驗(yàn)研究發(fā)現(xiàn)發(fā)動(dòng)機(jī)的性能參數(shù)除了油耗率高于SCR版設(shè)計(jì)要求外,其余參數(shù)均滿足設(shè)計(jì)要求,但是綜合考慮油耗與尿素消耗,油耗率差值會(huì)進(jìn)一步減小。根據(jù)性能及排放結(jié)果顯示,不使用后處理情況下,WP7.300E408柴油機(jī)排放能夠滿足國四排放限值要求,達(dá)到了本課題研究目的。
[Abstract]:The increasingly stringent emission regulations have brought new challenges to diesel engine technology. SCR will be adopted in the early stage of engine enterprises in China. Heavy duty diesel engine meets the preferred route of national IV emission. With the in-depth understanding of each technical route, the emission control technology using EGR DPF has been paid more and more attention. But SCR. DPF and other efficient post-processing devices have some problems, such as high cost, complex structure, short life, difficult maintenance and so on. Therefore, it is necessary to reduce the dependence on post-processing through internal purification to reduce the original emissions of diesel engine. In this situation, this paper aims at the problem of after-treatment emissions of WP7 diesel engine. The structure of WP7 engine is optimized and selected by combining EGR and high pressure injection technology. At the same time, the working state of the engine is calibrated and optimized based on the experiment. In this paper, the structure of WP7.300E408 diesel engine is optimized for the injector, combustor and cylinder head of the engine. The EGR cooler, supercharger and other components were selected, and the five points of A100B100B100C100B50B50C50 in the ESC emission cycle were selected for DOE selection. According to the emission performance of each component, the final experimental components are determined. According to the emission requirements, the range of calibration parameters is determined and the DOE design is carried out, and the bench is calibrated automatically. It can greatly reduce the experimental workload and speed up the experiment process. The ESCR ERC etc emission calibration is carried out, because this project is a post-processing country, in order to meet the emission requirements. The calibration of rail pressure is high, the main jet advance angle is very small in the discharge area and is below 5 deg, and the rear jet is only opened in the discharge area. The performance and emission results of the engine are tested and tested. The performance and emission of the engine are verified. Through the experimental study, it is found that the performance parameters of the engine meet the design requirements except for the fuel consumption rate higher than the design requirements of the SCR version. However, considering the oil consumption and urea consumption, the difference of oil consumption rate will be further reduced. According to the performance and emission results, no use of the post-treatment situation. WP7.300E408 diesel engine emissions can meet the national four emission limit requirements, and achieve the purpose of this study.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U464.172

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本文編號(hào)：1391587