Nghiên cứu hệ thống cung cấp Biogas nén cho xe gắn máy

KHOA HOC - CONG NGHE<br /> Tap Chi GTVT 12/2009 ooJQ<br /> <br /> NGHIEN cufu HE THONG<br /> CUNG CAP BIOGAS NEN CHO XE G A N MAY<br /> GS. TSKH. BUI VAN GA, ThS. NGUYEN VAN DONG,<br /> ThS. NGUYEN VAN ANH, ThS. TRUONG LE BICH TRAM<br /> <br /> 1. Gidi thieu Hinh 1 gidi thieu<br /> Biogas la nang Idpng tdi sinh cd ngudn gde td bien thien nang<br /> nang Idpng mat trPi vi vay viee sQ dyng nd lam nhien lapng Idu trQ dQpc<br /> lieu khdng lam gia tang ndng dd cdc chat khi gay hieu trong binh eo dung<br /> dng nhd kinh vao bau khi quyen. Biogas hien nay tich 30 lit theo dp<br /> dddc dung phd bien nhat dddi dang ngudn c h i t dd't s u i t nen Qng vdi<br /> de dun nau vdi Idpng tieu thy rat han ehe. Vi vay d thdnh p h i n CH4<br /> nhQng ndi ed h i m biogas tddng ddi Idn, Idpng biogas treng biogas thay<br /> dd thda p h i i t h i i ra ngodi trdi hay dd't bd. Dieu ndy ddi td 40-80%.<br /> mpt mat gay lang phi nang Idpng va mat khac lam Quan he nay eho<br /> tang ndng dd c h i t khi gay hieu Qng nhd kinh trong thiy neu nen biogas<br /> b i u khi quyen (methane cd tdc hai gay hieu Qng nhd ed thdnh phin<br /> kinh gap 23 lan so vdi carbonic). Viee tan dyng ngudn methane XCH4=80%<br /> Hinh 1: Bien thien nang<br /> biogas vdi qui md san xua't da dang de Idm nhien lieu vdo binh chQa 30 lit<br /> lapng ti'ch luy trong biogas<br /> eho ddng ed dd't trong Id rat d n thiet. d dp s u i t 20 bar thi<br /> theo ap suat nen<br /> Biogas ed thanh p h i n ehinh Id methane. Sau khi nang lapng lau trQ<br /> lpc ky cdc tap chat thi biogas cd tinh c h i t tddng td ddpe tddng dddng<br /> nha khi thien nhien. Day la nhien lieu sach ddpe vdi 0,5 lit xang.<br /> nhieu qudc gia phdt trien tren the gidi sQ dyng tren d Nang Iddng tich trQ<br /> td va xe bus. 6 Thuy Dien, khi biogas ddpe dung de ddpe ndy gap 110<br /> lam nhien lieu cho d td vd tau hda [1], [2]. lan so vdi nang a<br /> Trong nhQng edng trinh trade day chung tdi da Iddng d n thiet de<br /> nghien cQu edng nghe sQ dyng biogas lam nhien lieu nen biogas vao binh<br /> eho ddng cd tTnh tai keo may phdt dien [4]. Cdng chda (hinh 2). Neu<br /> nghe ndy cho phep cdi tao dpng ed phdt dien dy tinh gia dien 1500<br /> phdng chay b i n g xang d i u ed s i n sang chay b i n g ddng/kWh va gid<br /> hai nhien lieu biogas/xang hoac biogas/diesel. G i i i xang 15.000 ddng/lit<br /> phdp ndy giup ndng dan tiet kiem ehi phi san xua't thi chi phi nang<br /> dang ke nha't Id khi gid xang d i u vd dien lien tyc gia Idpng khi sQ dyng Hinh 2: Hieu qua nang lapng<br /> tang [3], [5]. biogas nen lam sd dung biogas nen<br /> nhien lieu eho<br /> Trong bai bdo nay chung tdi trinh bdy ket q u i<br /> phddng tien van<br /> nghien cdu nen biogas va thQ nghiem cung d p bio-<br /> ehuyen ehi chiem<br /> gas nen eho xe g i n may. ^CHJ<br /> nhd hon 1 % chi phi : 80",,<br /> 2. Tfnh toan qua trinh nen biogas<br /> nang Iddng truyen ; 60"i,<br /> G i l sQ qud trinh nen Id doan nhiet, pv^ = est, gpi thd'ng. Vi vay hieu<br /> Vg la the tich binh chda khi nen d dp s u i t sau khi nen q u i kinh te eua viee<br /> PJ va Vi Id the tich khi d dp s u i t ban d i u p,, neu hieu sQdyng biogas nen<br /> suit eua mdy nen la hj, thi edng c i n thiet de nen biogas tren phddng tien<br /> vdo binh chQa Id: van ehuyen ed gidi<br /> i-y la rat rd ret.<br /> V Pi<br /> W= (1) Khi thdnh p h i n<br /> 1-Y P. methane trong bio-<br /> gas g i i m thi hieu Hinh 3: Quang dadng hoat<br /> G i l sQ biogas chQa XCH4% CH4 cdn lai Id CO2, gpi q u i eua viee sQ ddng ddc lap L cua xe gan<br /> QLHV= 50,1 MJ/kg Id nhiet tri thap eua methane, MCH4 dyng biogas nen may theo ap suat biogas<br /> Id phdn tQ gam eua methane, nang iQpng cua nhien cung g i i m theo. Khi nen trong binh chda 20 lit<br /> lieu chaa trong binh biogas nen la: dp s u i t nen tang thi<br /> hieu q u i Q/W Qng vdi mdi XCH4 tien tdi mdt gia tri gid<br /> Q = P= ' ^^M,,^,Q,„^ (kJ) (2) han. Vdi biogas ed XCH4=80% thi gia tri gidi han cua<br /> RT, 100<br /> Q/W khoing 100, nghTa Id nang IQpng e I n thiet de<br /> <br /> Si' ddc diet 44 niem 50 ndm la-fi- c4i ^ 7 * ^ 7 ia- M ddu tien ( /960 - 20/0)<br /> ffl KHOA HOC - CONG NGHE<br /> <br /> <br /> <br /> nen biogas vdo binh chQa chi chiem khoing 1 % nang Bang 2. Thanh phan biogas sau khi Ipc bang cac<br /> IQpng ma biogas eo the tda ra. vat lieu khac nhau<br /> Quang dddng xe g i n may ed the hoat dpng ddc Thanh Khdng cd He thdng He thong<br /> lap phu thude vao nang Idpng biogas nen tich luy ddpe<br /> phan he thdng lpc bang lpc bang<br /> trong binh chda. Hinh 3 gidi thieu quang dddng hoat<br /> ddng ddc lap eua xe g i n mdy 1 lOec Qng vdi cdc gid<br /> (%V) lpc voi cue voi bpt-xiit<br /> tri dp s u i t nen khac nhau trong binh chQa 20 lit. Ket CH4 61- 72,1 83<br /> q u i nay eho tha'y de xe g i n may cd the hoat dpng ddc<br /> lap ddde tren quang dddng khoing 100km thi d n nen CO; 37 203 12,5<br /> biogas vao binh chQa 20 lit d dp s u i t 120 bar.<br /> 3. Nghien ciifu thQc nghiem nen biogas<br /> Thai<br /> ThQc nghiem ddpe tien hanh tai eae h i m biogas gian 10'23" 1846" 3142"<br /> eua 3 trang trai chan nudi khu vQc Da Nang tai cdc Xa ddt<br /> Hda Son, Hda Phu va Hda Ninh. Thanh p h i n biogas Qud trinh nen biogas thQ nghiem ddpe tien hanh<br /> eua cdc trang trai nay cho d b i n g 1. Chung ta tha'y theo 3 trddng hpp: nen trdc tiep, biogas khdng qua<br /> chat IQpng biogas san xua't tQ c h i t t h i i chan nudi ed he thd'ng lpc (1), sQ dyng cdt Ipc oxit s i t vd vdi nung<br /> thanh p h i n khdc nhau khdng dang ke. eye (2), sQ dyng cdt lpc oxit s i t vd hdn hpp vdi nung<br /> Bang 1. Thanh phan khi biogas d mdt sd trang bpt-xut (3). Biogas chQa trong binh khi nen ddpe ddt<br /> trai tai Da Ning thQ b i n g bep ga mini. Khi van bep ga md cQc dai,<br /> thdi gian ddt Qng vdi eae trQdng hpp Ipc khdc nhau<br /> Thanh ddpe gidi thieu d b i n g 2.<br /> Hoa Hoa Hoa<br /> phan Chung ta tha'y khi sQ dyng he thd'ng lpc oxit sat va<br /> Soil Phu Ninh hdn hop vdi nung bpt - xut, nang iQOng chQa trong<br /> (%)<br /> binh khi nen nhieu gap 3 lan so vdi khi nen biogas<br /> CH4 591 612 59,8 trQc tiep.<br /> 4. ThCr nghiem biogas nen tren xe gan may<br /> CO: 39 37 37,5 4.1. Tinh toan qua trinh cung cap biogas nen cho<br /> xe gan may<br /> H^S 0J21 0.123 0,192 So dd he thdng cung d p biogas nen eho xe gan<br /> may dddc gidi thieu tren hinh 4. Thi nghiem ddde thUc<br /> H;0 0,229 0457 0,168 hien tren xe Honda Wave a ed dddng kinh xi lanh<br /> D=50mm, hanh trinh piston S=49,5mm, ty sd nen<br /> CCK 1,55 1,52 2,34 £=10. Dpng CO cd cdng s u i t Pe=5,1kW d td'c dp<br /> n=8000 vdng/phut khi chay bang xang.<br /> Trddc khi nen vao binh, biogas di qua he thd'ng<br /> Ipc de khQ HgS vd lam g i i m COj.<br /> NhQ da gidi thieu treng [3], HgS cd the ddde xQ ly<br /> b i n g oxit s i t . Hieu q u i khQ HjS b i n g oxit s i t ed the<br /> dat den 98%. Ndng dp HjS sau xQ ly ed the rut<br /> xudng cdn khoang lOOppm, d i m b i o chat Idpng<br /> nhien lieu eung d p eho dpng cd ddt trong. Sau thdi<br /> gian lam viec khoing 6 thang, lpc HjS d n ddpe tai<br /> sinh bang each lay het phoi s i t ra khdi ept lpc, dd't de<br /> g i i i h i p rdi bd lai vao v| tri eu cung vdi IQOng oxit s i t<br /> bd sung.<br /> Khi CO2 trong biogas ed the ddpe khQ b i n g nhieu<br /> vat lieu khdc nhau. Trong nghien cQu nay, chung tdi<br /> khao sdt hieu q u i va tinh dn dinh cua he thdng khQ Hinh 4: SP dd h$ thdng<br /> CO2 b i n g vdi nung dang eye, vdi nung dang bdt, cung cap biogas nen<br /> diatomit dang cyc, diatomit dang bdt, sut va phd'i hpp cho ddng co xe gan may<br /> cae loai vat lieu nay. Ket q u i cho tha'y neu sQ dyng<br /> cdc loai vat lieu nay mdt each rieng re thi hieu qua xQ Khi cdi tao ddng cd sang chay bang biogas nen,<br /> ly cao nha't ed the dat ddpe 80%. Neu ket hpp vdi bpt Chung ta dat vdi phun biogas ed dddng kinh df ngay<br /> va sut, hieu qua xQ ly COg cd the dat den 99%. Dac tai tiet dien hep nha't eua hpng Dh=15mm. LQu IQdng<br /> biet g i l l phap ndy eho hieu qua Ipc dn dinh d khoang hdn hpp biogas - khdng khi nap vao xi lanh tai mpt vi<br /> 50-60%. tri gde quay trye khuyu a cho trade la:<br /> Sau khi xem xet cdc du nhdpc diem eua tQng vat<br /> 7lD'<br /> lieu Ipc khde nhau, ehung tdi chpn phQdng an xQ ly Q(a) = Ti^Rco sinaH—sin 2a (m3/s) (3)<br /> khi biogas b i n g phoi s i t vd hdn hdp vdi nung bpt-xut. 2<br /> Thanh phan ehinh eua biogas sau khi qua he thd'ng Trong eae bleu thdc tren, r\^ la he sd nap, R=S/2<br /> xQ ly ddpe gidi thieu tren b i n g 2. la tay quay trye khuyu, co (rad/s) la td'c dp gdc, X Id ty<br /> <br /> <br /> Si' ddc diet 44 niem^ 50 ndm 1a^ c4i ^ 7 ^ 7 ia, ^ ddu tien ( /960 - 20/0)<br /> KHOA HOC - CONG NGHE<br /> Tap chi GTVT 12/2009<br /> <br /> <br /> sd giQa tay quay va chieu dai thanh truyen. 1,2 -<br /> Dd chan khdng tai hpng bd che hda khi tai mdt<br /> thdi diem eho trddc Id: wini 1 / \ ^"""\<br /> lull'""""<br /> ^P„ap(a) = - p „ ,<br /> Q(a) (Pa) (4)<br /> 0,8 -<br /> 1 / \-'AI l \ \ | Hinh 5:<br /> 0,6 -<br /> nDl III/ / 20",,A \ Wll ^ ^ nhac van<br /> . 4 0.4 •<br /> W 1 Do md birani ga 10% \ \\\vl cunfif cap<br /> Sau khi ra khdi bp dn dp, dp s u i t biogas di vdo \ Wvl diogas theo<br /> 0,2 -<br /> van eung d p Id p^iogas (Pa)- Do dd td'c dp biogas ra \M|I gdc quay trpc<br /> khdi Id eung d p Id: 0 •<br /> g^y^ a (dp) ^0^^ khuvu cua<br /> 40 80 120 160 ddng CO<br /> fAp„.ra) + pbiotas C<br /> <br /> Vbi„(a) = (m/s) (5)<br /> Dieu chiiili dp L,;^! dam li6n hdp<br /> k ctfiig 16 xo \ ,<br /> Neu gpi d, la dddng kinh cua vdi phun biogas thi<br /> Idpng biogas cung d p eho dpng cd trong mpt chu 1<br /> trinh Id:<br /> -e-<br /> Trdf<br /> _ 4 |v,,„(a)da (m3) 0,8 •<br /> Q.,o = (6)<br /> (0 /\ Klioiig c6 lie thoiig<br /> Trong bleu thQc tren pt,;,, (kg/m^) Id khd'i iQOng / dieu chiuli Hinh 6:<br /> rieng eua biogas.<br /> Dadng dac<br /> Lapng biogas nay chinh b i n g Idpng biogas cd the<br /> 0,6 < tinh bp che<br /> chdy hoan todn vdi Idpng khdng khi nap vdo xi lanh<br /> hda khi cung<br /> trong mpt ehu trinh: Do md brfdm ga (%) cap biogas<br /> 0,4 - cho dpng co<br /> ^ _ 100 Ti^V, '<br /> (m3) (7) 10 30 50 70 90 xe gan may<br /> 16X, 100 400<br /> 16XcH4 23.29 dpng cP, Idpng biogas cung d p tang d i n , sau dd dn<br /> d|nh quanh gia tr| ij) = 1. Ket qua nay cho tha'y dddng<br /> TQ (6) vd (7) ta suy ra dddc dddng kinh vdi phun dae tinh bd che hda khi biogas vdi van chan khdng cd<br /> biogas df. dang tddng tQ dQdng dac tinh bd che hda khi ddn<br /> Vdi riv=100%, XcH4=80%, Pbiogas=1000Pa, chung g i i n . Do dd de dpng eO cd the lam viee dn dinh d cdc<br /> ta xdc dinh ddpe dddng kinh vdi phun biogas ehe dp t i l khde nhau chung ta d n bd sung them bd<br /> d,=4,60mm. phan lam dam hdn hpp d che dp t i i tha'p bang cdch<br /> Viec d|nh lapng biogas eung d p vdo dpng cd thay ddi sQc cang Id xo eua van eung d p . Mat khdc,<br /> dddc thQc hien bang van hut ehdn khdng kieu mdng de eho xe g i n may Idm viec tiet kiem d ehe dp tai<br /> nha hinh 4. Dp chan khdng tai hpng bp che hda khi tha'p va trung binh ddng thdi cd the phdt het cdng s u i t<br /> Apnap tdc dung len mdng mdt iQc hut d che dp tai Idn, he thd'ng ddpe bd sung them mdt<br /> ^2 van cung d p biogas vdi dd cQng Id xo Idn hon, chf<br /> D^<br /> Fw =k,^7r - Apnap , trong dd k^ la he sd phdn IQe tdc dpng khi dp chan khdng tai hpng bp che hda khi<br /> Idn hPn mdt gid tr| nha't dinh.<br /> do dp cQng eua mdng. Khi IQc hut nay t h i n g IQc edng 4.2. Phdi hqp SLf dung biogas/xang<br /> eua Id xo F|x= Kx, trong dd K la dp cQng cua Id xo, thi Do biogas ed thanh phan CH4 hoi tha'p nen dpng<br /> van nhac len mpt doan 5h = x.Sg/s,, tao ra tiet dien CO khd khdi ddng va khd glQ dn d|nh d che dd khdng<br /> Idu thdng S„an = tdf5h vdi gid tri cac dai S„an max='tdV4, t i i khi chay trQc tiep b i n g biogas. De giai quyet khd<br /> tQc 5h„a,=d,/4. khan nay ehung tdi eho ddng ed chay bang xang d<br /> Dp nhac ciia van 5h vi vay Id mpt hdm sd theo gde ehe ddng khdng tai vd khi khdi ddng. Bd che hda khi<br /> quay trye khuyu a. Khi thay ddi he sd nap 5^ tQ 10% cua dpng cd ddpe edi tao b i n g cdch l i p them mdt vit<br /> den 100%, bien thien dp nhac 5h dQpc gidi thieu tren dau cdn dddi ddy budng phao de bit kin zicio ehinh<br /> hinh 5. Ket qua tinh toan nay dQpc thQc hien vdi khi chay b i n g biogas (hinh 7). Nhd vay khi chay b i n g<br /> k„=0,5; K=0,5N/mm vd X C H 4 = 8 0 % . biogas ehi cd he thdng xang khdng tai heat dpng. Khi<br /> LQU IQpng thQc te biogas di qua van cung cap Id: bddm ga md Idn, dp chan khdng phia sau bddm ga<br /> g i i m , xang khdng phun ra vdi phun khdng t i i , chi ed<br /> Qbio.„—jv«„(a)S,„(a)da (8) he thdng cung d p biogas Idm viee. Nhd phdi hpp<br /> to<br /> cung d p nhien lieu xang vd biogas, dpng ed ed the<br /> TQ dd chung ta cd the tinh dQdc dp dam dae eua Idm viee dn dinh d ta't ea cdc ehe dp cdng tdc, dac biet<br /> hdn hpp biogas - khdng khi theo dp md bddm ga eua Id trong giai doan ehuyen tiep td khdng tai sang ed tai.<br /> ddng cd (hinh 6). 6 che dp tdi tha'p, hdn hpp rdt Khi mudn sQ dyng lai nhien lieu xang, ehung ta<br /> ngheo do dp chan khong t^i hpng bp che hda khi chi ehi can ndi vit khda zicid chinh. He thdng cung d p<br /> diJ sijtc m d nhp van cung cap biogas. Khi tang tdi<br /> <br /> Si' ddc diet 44 niem 50 ndm 7a/i- c4i ^ 7 ' ? ' 7 ia M ddn tien ( /960 - 20/0)<br /> aiKHOA H O C - C O N G NGHE<br /> <br /> <br /> <br /> nhien lieu xang hoat ddng binh thQdng nhQ trade khi cap cho dpng cd.<br /> A<br /> cai tao. 2. Ty le giQa nang lupng biogas nen va nang iQpng<br /> Lap dat he thdng eung d p biogas nen cho xe g i n e I n thiet de nen biogas dat gid tri dn dinh khi dp sua't<br /> may Honda Wave a thQ nghiem ddpe gidi thieu tren nen tang cao. Ty le nay la 50 khi thdnh p h i n CH4<br /> hinh 8. trong biogas dat 40% va tang len 100 khi thanh phan<br /> nay dat 80%.<br /> 1. Ld xo ga, 2- 3. Kha nang sQ dyng biogas nen tren xe g i n may<br /> Piston ga, 3- va eae phddng tien van chuyen Id hien thdc. Xe gan<br /> Kim ga, 4- Zicld mdy CO the hoat dpng ddc lap 100km khi sQ dung<br /> Xang khdng tai, binh 20 lit chda biogas nen den dp s u i t 120 bar •<br /> 5- Zicld chlnh, Tai lieu tham khao<br /> 6- dng tao bqt [1 ]. http://www.automotivesweden.se/arkiv/articles/<br /> khi, 7- Phao majorinvestmentinbiogasinskaraborg.5.11580c43120<br /> Xang, 8- Buong C6eb0f5d800019316.html<br /> phao, 9- LUdi [2]. http://www.sweden.se/fr/Aecueil/Travailler-<br /> ga, 10- Kim vivre/A-lire/La-Suede-vers-un-avenir-sans-petrole/<br /> van, 11- BQdm [3]. BUI VAN GA, TRAN VAN NAM, TRUONG LE<br /> gid, 12- Day ga BICH TRAM: Engines lueled by biogas: A contribution<br /> to energy saving and climate change mitigation. The<br /> Hinh 7: 6th Seminar on Environment Science and<br /> Bd che hda Technology Issues Related to Climate Change<br /> khi hai nhien Mitigation. Japan-Vietnam Core University Program,<br /> lieu Biogas/ Osaka, Japan, 26-28 November 2008<br /> Vit ch\iyen biogas/xang Xang [4]. BUI VAN GA, TRAN VAN QUANG, TRUONG<br /> LE BICH TRAM: Dong cq ITnh tai chay bang hai nhien<br /> lieu biogas-dieset. Tap ehi GTVT, pp 23-26, thang<br /> 12/2008<br /> [5]. BUI VAN GA, LE MINH TIEN, TRUONG LE<br /> BICH TRAM, NGUYEN VAN DONG: Kha nang giam<br /> phat thai CO2 d Viet Nam nhd san xuat dien nang bang<br /> biogas. Tap ehi Khoa hpe va Cdng nghe - Dai hpc Da<br /> Ndng, sd 1 (30)/2009, pp. 7-13.<br /> <br /> HOAN THIEN C i r s L .<br /> (Tiep theo trang 49)<br /> Hinh 8: a. Lap dat he thdng cung cap biogas nen<br /> cdn lai Id iQa chpn hinh thQc thu, cdc khoan thu vdi<br /> len xe gan may<br /> Id trinh thieh hpp, kha thi, phu hdp vdi thQc te, trien<br /> b. Xe gan may chay bang biogas nen thif nghiem<br /> khai nhanh, ed hieu q u i thiet thQc cung vdi viec<br /> 4.3. Ket qua thQ nghiem:<br /> dau td cai tao, nang d p , xdy ddng mdi, viee bao tri<br /> Khi Biogas sau khi qua lpc H2S bang oxit s i t va dddng bp mdi cd the dddc thQc hien theo dung chu<br /> Ipc CO2 bang hdn hpp vdi nung bpt vd xut ddpe nen ky, chaong trinh, ke hoach, tien tdi ed du ngudn<br /> vao binh chda 30 lit d dp s u i t 6 bar. Theo tinh todn d kinh phi eho bao tri, tao dieu kien de nadc ta ed mpt<br /> hinh 1 thi nang IQOng biogas chQa trong binh tQOng he thdng dddng bp td't ndl rieng, he thdng giao<br /> dddng vdi khoang 1/10 lit xang. Ket q u i thQc nghiem thdng hien dai ndi chung, dda nddc ta thanh nddc<br /> eho tha'y xe chay ddpe 5,5km vdi tdc dp dao dpng tQ edng nghiep vdo cdc nam 2020 vd cae nam sau,<br /> 30 - 50km/h thi het biogas trong binh chQa. Ket qua hdi nhdp ngdy mpt sau rpng vdo giao thdng van til<br /> nay phu hdp vdi tinh toan ly thuyet. Khd khan duy nha't the gidi ndi rieng va kinh te the gidl ndi ehung •<br /> lien quan den viee dp dyng rdng rai biogas nen tren xe Tai lieu tham khao<br /> g i n may la g i l l quyet khau Idu trQ nhien lieu. Vi vay [1]. Tai lieu Hoi thao qudc teve quan ly, lap Quy Bao<br /> van de tim kiem vat lieu che tao binh phu hpp va vat tri va phat trien dudng bo. Ha Noi ngay 4- 5 thang 5 nam<br /> lieu h i p thy methane de giam dp s u i t Idu trQ nhien 2000.<br /> lieu trong binh chQa cd y nghTa quan trpng trong [2]. Cue Dudng bo Viet Nam: dean Quy Bao tri dMng<br /> hQdng nghien cQu phat trien tiep theo cua de tai. bo 2009.<br /> 5. Ke't luan [3]. Bo Giao thong van tai: dU thao Nghi dinh ve quy<br /> Ket qua nghien cdu tren day eho phep ehung ta bao tri dudng bo (nam 2009).<br /> rut ra nhQng ket luan sau day: [4]. Vien Chie'n IUdc va Phat trien GTVT: Dean lap Quy<br /> 1. He thdng Ipc ket hpp giOa oxit sat, vdi nung bpt bao tri va Phat trien dudng bo Viet Nam, Ha Noi 2000.<br /> vd xut phu hpp ve gid thanh va dieu kien sQ dyng d [5]. Bo Giao thong van tai- Ngan hang The gidi: HQI<br /> ndng thdn. He thdng lpc nay eho phep loai trQ cae tap thao ve quy bao tri dudng bp Viet Nam, Ha N0i<br /> c h i t H2S vd CO2 d i m b i o c h i t Idpng nhien lieu eung 01/10/2009.<br /> i<br /> Si' ddc diet 44 niem 50 ndm. 7