Cov cim tseem ceeb ntawm diesel yog: flammability, evaporation, mobility, stability thiab corrosion thiab li ntawm.
Flammability (hluav taws):
Diesel combustion ntawm theem ntawm ib tug ncaj qha feem rau lub chaw ua hauj lwm ntawm diesel xyaw. Cetane naj npawb yog ib qho tseem ceeb ntawm kev sib tsoo thiab combustion kev kawm ntawm lub diesel hauv lub cav. Cetane xov tooj ntawm cov roj hluav taws xob ncaj qha cuam tshuam rau cov kev tua hluav taws ntawm cov roj hauv qhov hluav taws xob diesel.
Diesel roj muaj ib lub xov tooj cetane siab, nws cov hluav taws uas tsis tshua pom yoojyim, yoojyim rau txoj kev sib txuas ntawm lub cav diesel, lub cav ua haujlwm zoo. Yog tias cetane tooj ntawm cov diesel tsawg dhau, Biodiesel roj tsis yooj yim rau cov hlawv, yuav ua rau tsis txawv txav combustion, txo lub hwj chim ntawm lub cav. Tab sis cetane tooj ntawm diesel yuav tsum tsis txhob siab dhau, yog tias siab, diesel tsis tau hlawv tag nrho, roj noj ntau zog.
Cetane xov tooj ntawm cov diesel muaj feem xyuam rau nws cov tshuaj muaj pes tsawg leeg. Cov roj ntau cov ntaub ntawv roj cov ntaub ntawv roj cov tshuab, thov koj faj seeb rau cov roj nplaws pej xeem. Biodiesel Lub n-alkane muaj ntau tshaj plaws ntawm tus kab mob cetane, ua raws li cov cycloalkane, thiab polycyclic uas muaj ntxhiab hydrocarbon muaj cov kab uas qis tshaj plaws. Feem ntau tus cetane tooj ntawm diesel roj yuav tsum nyob rau hauv qhov ntau ntawm 45 ~ 60.
(2) Evaporation:
Kom ua lub cav pib thiab ua haujlwm kom zoo, lub diesel yuav tsum tau muaj cov evaporation zoo. Tab sis evaporation tsis tau muaj zog heev, vim hais tias tus nqi evaporation yog dhau sai heev, hlawv yuav nce ntau ntawm diesel, yog li ntawd lub cav ua hauj lwm tsis ruaj khov. Nyob rau tib lub sij hawm, lub evaporation yog muaj zog, uas yog, feem ntau yog lub teeb, lub viscosity yuav tsum yog me me, tsis tsuas yog yuav nce lub roj twj coj, Biodiesel tab sis kuj txo cov tshuaj tsuag zoo, thiaj li hais tias combustion tus txheej txheem deteriorated. Qhov no txhais tau tias cov evaporation ntawm diesel yog muaj zog heev los yog tsis zoo, qhov ntawd yog, feem ntau yog lub teeb los yog hnyav heev tsis haum. Lub evaporation ntawm diesel roj yog tsuas yog judged los ntawm distillation ntau thiab lub teeb nyem taw tes.
① Distillation ntau
50% rov qab kub: qhov tsawg dua qhov ntsuas kub, qhia tau tias qhov ntau lub teeb lub roj hluav taws xob, qhov zoo dua evaporation, Biodiesel kom cov diesel yooj yim los pib. Tus Txheem 50% ntawm cov kev cai ntawm qhov ntsuas kub rov qab yog tsis siab tshaj 300 ℃.
90% rov qab kub thiab 95% rov qab kub: qhov tsawg dua qhov kub, qhia tau tias cov khoom hnyav hnyav hauv diesel, diesel roj yuav ua kom qhov kev kawm thiab diesel cav zog kev ua tau zoo, Biodiesel txo roj noj thiab txo cov neeg kho tshuab hnav. Tus txheej txheem muab 90% rov qab kub thiab 95% rov qab kub tsis tshaj 355 ℃ thiab 365 ℃, feem.
② flash taw tes
Lub flash point ntawm diesel yog ob qho tib si ib qhov project tswj kev evaporation ntawm diesel roj thiab ib qhov project kom cov diesel stability. Feem ntau nws ntseeg tau hais tias cov roj teeb nyob rau hauv qhov chaw cia khoom thiab kev thauj mus los, flash point yog siab tshaj 35 ℃ yog kev nyab xeeb. Tus qauv qhia meej tias flash point ntawm diesel No. 0 tsis tsawg tshaj 55 ° C.
Diesel yog sib tov ntawm cov khoom roj petroleum thiab complex hydrocarbons (txog 10 mus rau 22 carbon atoms). Rau diesel roj. Feem ntau los ntawm kev sib cov nyom roj, catalytic cracking, kub cracking.
Qhov tseem ceeb tshaj plaws ntawm kev siv diesel yog rau diesel xyaw rau tsheb thiab nkoj. Muab piv rau roj, qhov hluav taws xob ntawm qhov hluav taws xob siab yog siab, roj noj tsawg tsawg. Biodiesel Diesel muaj qis zog noj, yog li ntawd qee lub tsheb me me thiab txawm tias qhov kev kawm siab kuj hloov mus rau diesel.
Diesel yog thaum muaj qhov ntsuas kub tsawg, yog li cov diesel cav tsis yuav tsum tau hluav taws xob xws li lub taub hau, uas siv cua tshuab kom huab cua txias, kom cov huab cua kub tshaj qhov diesel spontaneous combustion test, ces txau nrog diesel , cov roj nyom thiab cua pa Mixed tib lub sij hawm muaj cov hluav taws kub kub. Los ntawm qhov kev ua tau pom, lub tuam txhab hluav taws xob diesel cav tau muab cov neeg loj heev, kev vibration thiab cov suab nrov thiab cov paib ntawm cov pa phem heev, yog li siv cov roj hauv paus hauv paus uas yooj yim siv, tab sis xyoo tas los, cov neeg lag luam uas paub zoo txog lub tsheb zoo pib qhia txog qee qhov tseeb lub tshuab hluav taws xob cav Tuam Tshoj, zoo heev kev txhim kho cov neeg ntawm lub qhov hluav taws xob diesel engine, Biodiesel xws li FAW-Volkswagen tau cia li TDI diesel engine Bora, nws cov kev tiv thaiv ib puag ncig, lub zog thiab caij nplij siab tsis zoo rau cov roj av cav , tab sis kuj muaj lub cim diesel engine torque thiab ultra-tsawg roj noj, cov lag luam Lub prospects yog heev pheej.