Nghien ciju anh hirong cua ham lirong CO2 trong nhien lieu den dac tin lam viec va khi thai dong ca mot xylanh su dung khi sinh hoc
A Study on the Effect of CO2 Content on Engine Performance and Emission Characteristics ot ^mg e Cylinder Engine with Biogas Fuel
Tran Dang Quoc
Trudng Dgi hoc Bdch khoa Ha Ngi - SS 1, Dgi CS Viet. Hai Bd Trung. Hd Noi Din Toa sogn: 30-10-2017; chdp nhgn ddng: 18-01-2019
Tom tat
Sa; bao trinh bay mot nghien cou vi anh hadng cua ham logng CO2 co trong nhien lieu den dac tinh lam viec va dac tinh khi thai cda dong ca mgt xylanh cap nhien lieu tren daang ing nap. Bong ca nghien cou doac mo phong tren phin mim AVL Boost sau do dagc hieu chinh theo si lieu thgc nghiem cua mgt dong cathgc co ty s6 nen c = 10,5 so dung nhien lieu khong co C02. Cac kit qua thu dagc to dgng CCT mo phonp vai nhien lieu 100% CH^ se doac coi la thong si ca ban di so sanh va pban tich khi logng CO2 tang dan lan loot theo tha tg 3%, 10% va 22%. Dong co mo phong lam viec a diia kleri nha: lambda bang 1, buvm ga mo hoan toan, goc danh loa sam dagc diiu chinh di dat mo men Ion nhit, tic dp dong ca tbay doi trong khoang n = 1000 - 2000 vong/phut. Cac kit qua thu dagc to mo phong ch! ra ring^ anh hoang cua barn logng CO2 din mo men, cong suit va hieu suit nhiet la rit Ion. Nguyen nhan chu yeu lam giam hieu suat lam viec cua ddng ca la do ca nhiet tri thip va he so nap bi giam ddng thai. Tuy nhien, sg suy giam nay phan nao doac cai thien niu tang tic do cua dong ca va diiu chinh thai diim danh loa sam hon. Sg gia tang ham loong COs trong nhien lieu se ia giai pbap hieu qua di giam NOx ma khong can so dgng he thing luan hii khi thai (EGR).
TLF khda. Ham lugng CO2, Dgng ca mgt xylanh, Nhien lieu thay thd, Nhien li§u Biogas, Abtract
This adicte presents the research on effect of CO2 content on engine performance and emission characteristics of the single cylinder engine with pod injection. The research engine is simulated in AVL Boost software and then the simulated engine was corrected by the experimental data of the real engine has compression ratio E = 10,5 without CO2 in supplying fuel. The obtained results from simulated engine with 100% CH4 were considered the basic data to compare and analyse when the proportion of C02 In Biogas fuel was progressively enhanced such as 3%, 10% and 22%. The simulated engine operated in conditions as: X= 1. wide open throttle, early ignition timing was varied to obtaine maximum tourque, engine speed ' was changed into the range of n = 1000 ^ 2000 rpm. The achieved results from simulation have shown that the effect of CO2 portion Into supplying fuel on the torque, power and thermal efficiency were very strong. In this study, the main cause of reducing engine operation was clearly found out that was due to decreasing in low heat value and volumetric efSciency. simultaneously. However, the reduction of this can be , compensated by the method as increasing engine speed and adjusting early ignition timing. The increase of CO2 podlon into supplying fuel will be the effective measures to decrease NOx without using EGR system.
Keyword: CO2 proportion, Single cylinder engine, Alternative fuel, Biogas fuel,
1. Gidi thieu = 25-50%, H2S - 0-3%, H2 = 0-3% va H2O = 0-3%
Nhien heu khi sinh hgc hay con ggi la E [2], Sii dung khi sinh hgc lara nhien heu cho dgng ca INlllCIl l i e u Mil 311 til IIV- ""J • - " " 5V" ' " UIUBUJ ICI A'> . ~ I' - " , , . , " - - , - . mot trong rfiimg ngiik nmg luong tai tao (tiy tiSm ™ """"B f ' " " ? ' E"" P^^P ^^ >* <te co the cap nans tren thS g,6i va o nuoc ta, sii dnng nhien lieu T " <=''° nh™g/ung sau, vung xa va hai dao, nhitng Idti smh hoc cho dong CO d6t trong se khong lam tang ™°.S ™ ' > " ' ' * ? " I " ? ' S'", '^t'ua den duoc [3] Tay luong c o ; trong khi quySn [1], Khi smh hoc duoc ta, ??'.•=" T™!, • S ^ ''?''° ? ' J ' * ^'^ ' ° " ' ^ ' '"'V'^
tao S, nguSn ra^c tha, smh hoat hoac rac thai trong l*™? I™ "'.' ^ ^ rat eo h,, do, vol moi truong song Chan nudi o d i k kien khong co oxi, thanh phin cae ™.^',<" «•'!> 4™E •;°.''."" I' .!*• ,1« chay H^S se tao ra khi thu duoc sau phan htiy gfim: CH, - 50-75%, CO, "«" '"'^S 5 ° - "< ^0' ^a, khong ri,u„g jnh huong . f J ^ den sue khoe con ngua, ma con lam hong cac chi tiit
eua dong co d5t trong cu the la he thSng nap-thai va
• Dia chi lien he: Tel.: (+84) 963.915.476 xylanh ciia dong co, [4]. Mot aia, phjp g^g^ j]j„ ij Email: [email protected]
chi Khoa hge va C5ng nghe 132 (2019) 066-071 thfing dung va tiSt kiem, do la gidi phap sir dung phoi
sdt lam chdt khu dg loai bo H2S vd hieu sudt khii co thg d^t dSn 99,4% [5]. Mgt khi thanh phdn niia cung cdn dugc loai bo do la khi CO2, day la loai khi khong gay ra an mon nhung se lam giam nhiet tri thdp eua nhign lieu vd lara cdn tra toe dg lan tran mang lira.
Hinh 1. Dgng ca rao phong Dieu nay duac du bao rang lugng khi thai NOx se dugc gidm di nhung thanh phdn khi thai H-C khong chay hgt cd thg tang ten. Mgt trong nhUng yeu cdu can thiet de khac phuc dugc nhugc diera tren cua khi sinh hgc, dac biet la ham lugng C O : cd trong nhign lieu tang len khi raa higu qua bg lge giara [6], yeu cau do la tang dong nang ciia dong khi truac va trong suot qua trinh chay. Phuong an ky thuat co the phdn nao dap img dugc yeu cdu tren do Id tang toe do lara viec va thai diem ddnh lira sdra. Tuy nhign, cac anh hucmg oiia 16c do dpng co va gdc danh lira sdra theo ty le CO2 CO trong nhien lieu den dac tinh lam viec vd khi thai cua dgng co la chua ro rang hoac rat kho co the tim hieu dugc. Vi vay, uen hanh "Nghien ciru dnh huatig ciia hdm lugng CO2 den dac tinh ldm viec vd khi thdi dong ca mot xylanh hinh thdnh hon hgp ben ngoai sic dung khi sinh hoc''' la rdt can thiet. Dg xem xet moi quan hg giiia hdra lugng CO2 vdi cong sudt, hieu sudt nhiet (rje), gdc ddnh lira sdm toi uu vd cac khi thai, thuc hien nghign ciiu rao phong tren phdn mem AVL Boost se co tinh khoa hgc va cd the tiet kiem dugc chi phi nghien ciiu thir nghiem 2. Bieu kien va phirong p h a p thii' nghifim 2.1. Thanh phan nhien lieu thir nghiem
Nhien lieu se sii dung trong nghien ciiu ndy la nhiSn lieu khi sinh hgc sau khi da Igc bo hodn toan diroc thanh phdn H2S va H2O, thanh phdn cua nhign liSu nghign ciiu chii ygu g6ra khi Methane {CH4) va Carbone-dioxide (CO2). Hdm lugng CO2 cd trong nhien hgu dugc gid dinh se thay ddi idn lugt la 0%, 3%, 10% va 22%, cac gid tri ndy duoc nhap vao phdn nhien lieu trong AVL Boost se tinh dugc cdc gia tri cua nhiet tn thdp (QLH) tuang img. Nhien lieu vdi
ham lugng CO2 = 0 dugc coi la nhien lieu g6c dg hieu chuan mo hrah ban dau, Nhiet tri thdp cua nhien lieu se bign doi theo hdm lugng CO2 co trong nhien lieu, cdc gia tri nhiet tri thdp dugc phdn mira AVL Boost tinh ra kgt qua nhu bang 1 [7].
Bang 1. Ham lugng CO2 trong nhien lieu STT
1 2 3 4
Thiinh p h a n nhien lieu
(%)
CH4 = 100 CH4 - 97 CH4 = 90 CH4 - 88
CO2 = 0 C O j - 3 CO, = 10 CO, - 22
Nhiet t r i t h a p Qi.n(kJ/kG) 50000 49473,344 45730,481 39699 2.2. Mo phong va hieu chuan mo hinh
Dgng CO nghign ciiu duge rag phdng bdi phdn mgm AVL Boost (Hinh 1) vdi cac thong s6 ca bdn dugc lay ni dgng co mgt xylanh QTC2015 thugc dg tai cap Bg ma so B2015-01-106. Cdc thong s6 dgng CO rad phong dugc trinli bdy trong bdng 2. Co sd ly thuyet phuc vu cho nghien ciiu rao phdng duoc tham khao va lua chon tir tai lieu hudng dan cua AVL Boost [8] nhu:
Dinh luat nhiet dgng hgc thu nhat dig hign moi quan he giUa sir bien thien cua ngi nang (entanpi) vdi su bien thien cua nhigt va c6ng.
He so truyen nhiet dugc tinh theo rao hinh Woschni 1978.
Mo hinh chay Fractal dimg cho ddng ca ddnh lira cudng buc va khi nap dong nhdt.
Gia tri CO dugc tinh todn dua vao giai phuang trinh vi phan doi vdi hai phdn ung: CO + OH = CO2 + H v a C 0 2 + 0 = CO + 02,
Gia tri cua H-C duoc xdc dinh tir cac nguon chfnh cua H-C chua chay Uieo phuang phap ciia D'Errico.
H i n h 2 . D g n g c o Q T C 2 0 1 5
Taip chi Khoa hi'
Co che hinh thanh N O , trong mo phong BOOST dua tren ca sd cua Pan:as vd Hafner. Qud trinh hinh thdnh cua chiing dugc the hien qua sau phugng trinh phdn ung theo co chg Zeldovich.
Hieu chuan dgng co rao phong dugc tign hdnh dua tren eo sd so iieu thuc nghiera ciia dgng co QTC2015 (Hinh 2) tai ty s6 nen e = 10,5 vd nhien heu Id CH4 = 100%. Su sai lech giira kgt qud mo phong va ihuc nghiem ldn nhat khodng 3 % , vdi kgt qua sai lech nay cho phep sii dung dgng ca mo phong de tign hanh cac phuang phap thi nghiem khac tdiau.
Bang 2. Thong so ky thuat cua dgng ca rao phong Thong so
Dudng kinh xylanh (mra) Hanh trinh piston (mm) Sd xylanh Toe do dinh miic (v/ph) Ty so nen (-) So ky (-)
Ky hieu D S 1 ridm
s T
Gia tri 103 115 1 2200 10,5 4 2.3. Phuffng phdp thi nghiem
Dg thu dugc cac kgt qua nghien cim vg dnh hucmg cua ham lugng COi dgn dac tinh lam viec va kb) thai dgng ca mgt xylanh, cac digu kien thi nghiem se dugc thuc hien nhu sau:
Hudng den dieu kien hoa trgn ly tudng giCra khdng khi va nhien lieu truoc khi hinh thdnh raang lua, gid tri larabda duac chgn 'k = I.
Do md cua budm ga (WOT: Wide Open Throttle) Id 100% nhdm giara t6i da ton that trgn dudng ong nap,
Thdi dilra ddnh lira sora (IT: eariy Ignited Timing) dugc thuc hien trudc digra chet tren va thay ddi trong khoang tir 10 ^ 20 do gdc quay true khuyu, vdi budc thay doi de dat dugc gid tri mo raen ldn nhat AIT = 2.
Ddi tdc do dgng co mo phong thay doi trong khoang n = 1000 -^ 2200 vdng/phut, budc thay doi trong suot qua trirdi thir nghiera la An = 200. tCet qud thu dugc se dugc xem xet vg miic do dnh hudng ciia tdc do ddng CO va hdra lugng CO2 den cac chi tigu lara viec cua dong ca.
Dg ddnh gid miic do dnh hudng cua hdra lugng CO2 cd trong nhien lieu, khdi Iugng nhien lieu se dugc giir nguygn ddi vdi ca bon loai nhien lieu (0,4569 g/s),
3. Pban tich sd lieu
3.1. Anh hudng cua hdm lugng CO2 den dac tinh lam vi$c cua dgng cff
Hrah 3 Xhh hien su bign ddi cong suat dieo toe do ddng ca d digu kien ^ = 1, bdra ga mo h o ^ " / ° ^ "
(WOT) vd gdc ddnh lua sdra dugc dieu chmh de d^t gia tri rao-raen ldn nhdt (MBT). Nhin chung sir bien thien cong sudt theo t6c do dpng co cua bon ty l_e CU2 d6u cd xu hudng diay ddi nhu nhau, tuy nhien,_ t^i radi tdc do ddng co gid tri cong sudt lai co ty^ le nghich vdi % CO. cd Irong nhien heu. Trong khoang tu 1000 vdng/phut dgn 1800 vong/phiit, cong suat dong ca cd thg coi la raot hdm ddng bien vdi bien so la t6c do ddng co. Tuy nhien, cong, sudt dgng ca lai chuygn thanh hdm nghich bign khi toe do dgng ca Ion hon 1800 vdne/phut vd cue tri cua ham so nay dugc tira thdy tai tdc do 1800 vong/phut.^ Nguygn nhdn lam cho cdng sudt cua dgng co thay doi khi toe dg dgng ca tang, cd thg la do da cai thien dugc hieu suat chay cua hon hgp ben trong xylanh ddng co, Nhung khi tang tdc do dgng co ldn hon nua se lam tang dnh hudng ciia dp sudt ngugc dgn he so nap, va ket qua la cdng sudt ciia dgng co c6 xu hudng gidm d tdc do ldn hon 1800 vong/phut. Quan sat cac kgt qua tiiu dugc tren hinh ve cd thg didy rang, dudng nhu toe do chdy ciia hdn hgp trong dgng co da dugc cai thien dang ke ngay ca khi ty le CO2 tang. KSt qua nay cd thi thdy ro d toe do dinh miic ciia dgng co (2200 vong/phiit), cong sudt dong co vdi 22% CO2 co Uong nhign lieu biogas xdp xi bang cong sudt cua ddng ca tai 1400 vong/phut khi da loai bo hoan toan CO2 ra khoi nhien lieu. De Idra ro hon dnh hudng cua CO2 den cdc thdng sd Idra viec cua dgng co cdn phai xet den suat tieu hao nhien heu ciia bdn loai nhien lieu I khde nhau khi thay doi toe do dpng co.
Hinh 3. Anh huang cua toe do dgn cong sudt cua dgng ca
cM Khoa hoc va Cong nghg 132 (2019) 066-071
Toe d ; dJDg ccr. D (kdng/pbiil]
Hinh 4. Bien ddi cua suat tieu hao nhien heu theo tdc do dgng ca
Hinh 4 the hien dnh hudng cua toe do dgng co den sudt tieu hao nhign lieu ddi vdi bdn ty le CO2 khac nhau: 0%, 3%, 10% vd 22%. Theo chieu tang cna toe do dpng cg, sudt Hgu hao nhien lieu co xu hudng giam va sau dd lai cd xu hudng tang d toe do Ion hon. Gid tri nho nhat cua sudt tigu hao nhign lieu dugc tira thdy d tdc dd 1400 vong/phiit md khdng phu thuoc vao ty le CO2 cd trong nhien heu. Nguyen nhan dan den su suy gidra cua sudt tieu hao nhign lieu la do cai thien dugc phan nao cua hieu sudt nhiet. Tuy nhien, muc do cdi ihien ndy dudng nhu vdn chua du khi toe do ddng co ldn han 1400 vong/phiit, Nguyen nhan lam cho suat tieu hao nhign lieu cd xu hudng tang chii yeu la do ty le CO2 co trong nhien Iteu. Dieu nay co the de dang chirng rainh bang ket qua thu dugc tren hinh ve, tai radi tdc dd ddng cg sudt tieu hao nhign heu tang khi ty le CO2 cd trong nhien lieu tang.
De lara ro hon anh hudng cua thanh phan CO2 CO trong nhien heu dgn cdc thdng so ky thudt cua dong CO, nghien ciiu tilp theo dugc tign hanh mo phong tai tdc do n = 1400 vdng/phut. Khdi lugng nhign lieu cdp cho radt chu trinh dugc giir nguygn vdi CHA - 100%, sau dd thay ddi ty le CO2 theo thii Ur 15n lugt la 3%, 10% vd 22%, Hinh 5 thi hien anh hudng ciia ty le CO: co trong nhien heu den rad raen va hieu sudt nhiet ciia ddng co khi cd dinh lugng nhien lieu cdp tai 1400 vong/phiit Tu cac ket qua thu dugc cd thg thdy rd rang hon dnh hudng ciia ty lg CO2 CO trong nhien lieu din md men va hieu suat nhiet cua dpng CO, cd rao raen va hieu sudt nhiet deu cd xu hudng gidra gidng nhau. Nguyen nhdn lara xudt hien xu hirdng nay la do ty le CO2 cd trong nhign lieu Biogas da lara gidm he sd nap va can trd tdc do lan trdn mdng lua d ben trong xylanh ddng co. Kgt qua nay da chi ra rang gdc danh lua sdra cua ddng ca cdn phai dugc dieu chinh theo hdm lugng CO2 cd trong nhign ligu.
Hinh 6 trinh bay ket qua nghien ciiu ve dnh hudng ciia ham lugng CO2 din gia tri ciia gdc danh Ida sdm
tdi uu ddi vdi hai trugng hgp la khdi lugng nhien hgu cdp khdng ddi (Gni = const) va ?. = 1 d cirag dilu kien Id n = 1400 vdng/phut va IT = MBT Tir cdc kdt qud thu dugc cd thg thdy rang gdc ddnh lira sdra tdi uu cua ca hai trudng hgp gidng nhu hara sd tuygn tinh thay doi theo hara lugng CO2 trong nhign lieu, gia tri tuyet ddi ciia gdc danh lua sdra tang khi ham luong CO2 tang. Chinh xac han la phdi dieu chinh gdc danh lua trudc diem chet tren sdm hon neu hara lugng CO2 trong nhien heu tang. Xet vdi trudng hgp Gni = const, cac ket qua rao phdng da chi ra rang khi hdra lugng CO2 trong nhign lieu tucmg iing Id 0%i, 3%i, 10%i vd 22% thi gdc danh Ida sdra tdi uu ldn lugt la IT = 16, 17, 19 va 25 do trudc diem chet tren. Nguyen nhan ldm xuat hien xu hudng nay Id do su xuat hien cua CO2 cd trong nhign lieu da Idra can trd qua trinh dot chdy cua hdn hgp bgn trong xylanh ddng co. Trudng hgp (Gni = const), gdc danh lira sdra cdn phdi dieu chinh sdm hon so vdi trudng hgp ^ = 1 bdi vi nhiet tri thdp vd ndng lugng lap trung cua nhien lieu d ben trong xylanh ddng ca da bi giara rat nhanh khi hara lugng CO2 cd trong nhign tang den 22%,
Tir cac ket qua thu dugc d trgn cd thg thdy rang dnh hudng cua ham lugng CO2 cd trong nhign lieu dgn dac tinh lara viec cua ddng co la raf ro rdng, tuy nhien cdn phai xem xet vd phdn tich anh hudng cua hdm lugng CO2 den dac dnh khi thdi cua ddng ca
Hinh 5. Anh hudng cua %C02 den md raen va hie sudt cua ddng co
M i l F i i U t i i : B l o g » W O T
= 1^,00 r p m
' s C O ; IroDg DbliB Iftu
T a p c h i K h o a h(
Hinh 6. Anh hudng cua hdm lugng CO2 den danh Ida
5
0
N h i a EiftL B l o g u
/ -»-C02 = 3W
-m-coi=wn
r-""^ ^—t—
^dc
§
• =
^/JS
^
Nlilcn Ilea' Bkigas I T : MBT
00 1200 1
..^ __
00^ w o o 1800
1
- l - C 0 Z = 3 «
" i , - C 0 2 = M ' * j ^ C 0 2 = 2 I * t
looo 2200 2
1000 1200 1400 160O 1800 2000 2200 TMdgaoB|cir,ii(v-oQ&'pliiO
Hinh 7. Phdt thai CO theo tdc do ddng ca
•> CO. m n g nC
Hinh 8. Phdt thai NOx vd HC dieo ty le CO2
Hinh 9. Phdt thai NOx theo tdc do ddng ca
Hinh 10. Anh hudng cua tdc do din phdt thai H C 3.2. Anh hie(9ng cua % CO2 din phdt thai cua dong Cff
Quan sat cac k i t qua thu dugc tir Hinh 7 cd the nhan thdy rdng dnh hudng cua CO2 trong nhien lieu din phat thai CO tai d i l u kien rad phdng A = 1 la tuong ddi gidng nhau. Khi tang tdc dd ddng ca, lugng phat thai CO cd xu hudng tang ddn ddi vdi tdt cd cdc ty le CO2 trong nhign lieu. Trudng hgp nhien lieu Biogas cd hara lugng CO2 trong nhien Ueu thap hon 3%. thi thay ddi nay la khdng dang kg, my nhign khi hdm lugng nay ldn hon 3%. thi phdt thai CO tang rat nhanh, Xet tai mgt vi tri tdc dd, cd thg thay dugc anh hudng ldn cua CO2 cd trong nhign lieu den phat thai CO la rdt ldn, hara lugng CO2 trong nhien heu vd phdt thdi CO nhu Id mdt hara ddng bign. Khi so sanh giira nhien lieu Biogas cd CO2 = 22%i vd nhien lieu Biogas cd CO2 = 0%) thi hara lugng phdt thai CO tang gap khoang 25 ldn. Nguyen nhdn chd yeu lam cho CO tang la do ham Iugng CO2 trong nhien lieu da lam giam kha nang chay cua hdn hgp d bgn trong xylanh ddng eg. Kgt qud nay cd the du bdo rang lugng khi thai NOx vd H-C se co su thay doi khac nhau,
Hinh 8 thg hien lugng phdt thai N O , vd H-C ldn nhat theo sir gia tang cua ham lugng CO2 cd trong nhien lieu tai digu kien A = 1. Theo chilu tang cua CO2 trong nhien heu, phdt thai NO^ ed xu hudng gidra. Nguygn nhan Id do su gia tang thanh phdn CO2 cd trong nhign lieu se lam gidm nhiet dd trong budng chdy cua dgng ca. Nguoc !ai ddi v<Ti phdt Uiai H-C, khi tang ham lugng CO2 cd trong nhien lieu, se lam gidm kha ndng bat chdy cua hdn hgp vi vay lugng khi thdi H-C cd xu hudng tang len. Dg ldm rd hon anh hudng cua CO2 d i n phdt thdi N O , vd H-C, cdn phdi xem xet d dieu kien tdc do ddng co thay ddi.
Hrah 9 the hien su anh hudng ciia thanh phdn CO2 CO trong nhien heu din phdt thai NOx tai dilu kien mo phdng \ - 1. Quan sdt cdc kit qua thu dugc trgn hinh ve cd the thdy rang theo chilu tdng cua t i c do ddng ca, phat thdi NO^ cd chung mgt xu hudng thay ddi gidng nhau raa khdng quan tam d i n ham
i Khoa hoe v^ Cong nghf 132 (2019) 066-071
luang CO2 cd trong nhien lieu. Trong khoang n = 1000 vdng/phiit den n = 1200 vdng/phiit, lugng phat thai NOx CO xu hudng tang va dat cue dai tai 1200 vong/phiit, sau do cd xu hudng gidra d tdc do ldn hon. S\r khde biet cua NOx tai hai vung tdc do la do cai thien dugc kha nang truyen dan nhiet d ben trong bu6ng chay ciia ddng ca.
Hinh 10 the hien su anh hudng cua thanh phdn CO2 CO trong nhien heu tdi phat thai HC tai dilu kien thi nghiem vdi A ^ I. Ciing nhu phat thai N O , , khi Sng tic dp dgng co, phdt thdi H-C cdng cd xu hudng tang vd dat cue dai va giam d tdc dd ldn han. Nhung khi xet tai cung mot vi tri tdc do, khi tang thanh phdn CO2 CO trong nhien lieu, phat thai H-C cd xu hudng tang. Nguygn nhdn chinh la do dnh hudng cua C02 cd trong nhien lieu lam giam kha nang bat lua cua hdn hop.
4. Kit luan
Anh hudng cua hara luong CO2 d i n dac tinh lam vi6c va khi thdi ddng co mgt xylanh hinh thanh hon" hgp bgn ngoai dugc thuc hien d cac dieu kien nhu; %= \, budra ga rad hoan toan (WOT), goc ddnh lira dieu chinh dg dat md raen cue dai (MBT), nhign Heu sinh hpc dugc sir dung vdi 4 ty le CO2 khac nhau Iheo thii tu ldn lugt Id 0%, 3 % , 10% vd 22%. Tir eac phan tich ket qua d tren cd thg nit ra cac ket luan sau:
Ham lugng CO2 cd trong nhien ligu anh hudng rat Ion den cdng sudt, rad raen vd hieu suat nhiet cua dgng CO.
Xu hudng digu chmh gdc danh lira sdm theo ham lugng CO2 va toe do ddng co la gidng nhau, tuy nhien anh hudng cua hara lugng CO2 trong nhidn lieu den gia tri gdc danh Ida la ldn hon.
Anh hirdng cua hara lugng CO2 d i n thanh phdn cac khi thdi la ldn hon so vdi tdc do ddng cg, ham luong CO2 tang se Idra giara nhiet do ben trong budng chay vi vay NOx dugc gidm ddng ke. Tuy nhien, khi
thai H-C lai cd xu hudng tang nhanh la do kha nang bat chdy cda hdn hgp giam
Tai lieu t h a m khao
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