Taw qhia txog Diesel Particulate Filter

Diesel particulate filters muab faib ua active regeneration thiab passive regeneration raws li lawv cov kev cai ua hauj lwm. Passive regeneration txhais tau hais tias ntev li ntev raws li qhov kub thiab txias txias tau ua tiav, cov khoom seem uas tau sau los ntawm lim yuav ua tiav. Active regeneration txhais tau hais tias thaum lub tsheb tsis ua raws li tej yam kev mob tshwm sim, lub system yuav tsum tau nquag tsim tej yam kev mob rau cov txheej txheem particulate. Nyob rau hauv lub emission system ntawm lub locomotive, lub emission ntawm particulate teeb meem yog thaiv los ntawm kev siv corundum. Cov ntaub ntawv qhia tau hais tias qhov kev ntsuas no tuaj yeem txo cov pa phem emissions txog li 80%.
Khoom Taw Qhia
Hauv kev lag luam tsheb tam sim no, lub tshuab hluav taws xob sab hauv yog qhov tseem ceeb ntawm lub zog tsheb. Roj combustion yuav ua rau muaj teeb meem residues, xws li carbon soot particles (PM). kuv lub teb chaws tau tshaj tawm tshiab "Txoj Cai Lij Choj ntawm Cov Neeg Sawv Cev ntawm Tuam Tshoj ntawm Kev Tiv Thaiv thiab Tswj Cov Cuab Yeej Cuab Yeej" tau muab cov kev cai nruj dua rau kev tso pa tawm ntawm kev siv lub cev muaj zog. Lub teb chaws thoob ntiaj teb kuj tau tsim cov kev cai emission nruj dua los txo cov pa phem ntawm lub tsheb tso pa tawm mus rau ib puag ncig. Diesel cav tso pa tawm tau nyiam thoob ntiaj teb kev mloog vim Volkswagen's "Exhaust Gate" xwm txheej. Cov teeb meem tsis zoo uas cuam tshuam los ntawm cov tshuab hluav taws xob diesel yeej ib txwm yog ib qho ntawm cov neeg ua haujlwm hauv tsheb. Teb chaws Europe thiab txawm lub ntiaj teb no tau tshaj tawm nruj heev tsheb pa emission qauv. Cov European tsheb tso pa tawm cov qauv, uas yog sib koom ua ke los ntawm lub tsheb tso pa tawm cov cai ntawm Economic Commission rau Tebchaws Europe (ECE) thiab cov tsheb tso pa tawm cov lus qhia ntawm European Union (EU), yog cov qauv tsheb tso pa tawm ua ke los ntawm EU lub teb chaws. txhawm rau txwv qhov kev puas tsuaj rau ib puag ncig uas tshwm sim los ntawm lub tsheb tso pa tawm cov pa phem. Tam sim no, muaj kev txwv rau nitrogen oxides (NOx), hydrocarbons (HC), carbon monoxide (CO) thiab cov teeb meem (PM) tawm los ntawm yuav luag txhua hom tsheb. Rau txhua hom tsheb, lub tsheb tso pa tawm cov qauv sib txawv. Hauv Tebchaws Europe, cov qauv tsheb tso pa tawm feem ntau tau hloov kho ib zaug txhua plaub xyoos. Piv nrog rau cov qauv tsheb tso pa tawm hauv Tebchaws Meskas thiab Nyij Pooj, lawv cov kev xeem yuav tsum tau dav dav. Yog li ntawd, European tsheb tso pa tawm cov qauv kuj tseem yog lub tsheb tso pa tawm uas siv los ntawm ntau lub tebchaws tsim. kuv lub teb chaws tus qauv tsheb tso pa tawm yog tsim nrog siv rau European tsheb tso pa tawm cov qauv. Cov "Lub teeb-lub luag hauj lwm ntawm lub tsheb Pollutant emission txwv thiab Measurement Methods (I)" tau siv nyob rau hauv 2001 yog sib npaug rau tus qauv Euro I (EU I los yog EURO I), lub "Lub teeb-lub luag hauj lwm tsheb Pollutant Emission txwv thiab ntsuas txoj kev (II)" tau siv nyob rau hauv 2004 yog sib npaug rau tus qauv Euro II (EU II lossis EURO II), National III tus qauv siv rau xyoo 2007 yog sib npaug rau Euro III tus qauv (EU III lossis EURO III), thiab National IV tus qauv siv hauv 2010 yog sib npaug rau Euro IV tus qauv (EU IV lossis EURO IV).
Tus qauv Euro VI muaj kev txwv nruj dua thiab cov kev cai ntawm PM dua li tus qauv Euro V. Hauv National IV era, muaj ob lub ntsiab kev hloov kho tshiab rau diesel cav tso tawm tom qab kho cov khoom siv. Ib qho yog siv cov txheej txheem xaiv catalytic txo qis (SCR) los kho cov nitrogen oxides hauv cov pa pa uas siv cov tshuaj urea; Lwm qhov yog EGR (exhaust gas recirculation) thev naus laus zis los kho cov khoom tsim los ntawm kev sib txuas los ntawm cov lim dej diesel (DPF) lossis diesel oxidation catalyst (DOC). Nws feem ntau lees paub tias txoj hauv kev zoo los txo cov cav diesel PM yog siv DPF. Thaum National IV tus qauv tau hloov kho rau National V tus qauv, PM yuav yog qhov teeb meem tseem ceeb los daws, thiab kev daws teeb meem yog siv DPF.