Thong tin khoa hgc cdng nghg mo w /NGHIEN cOtJ THIET KE CONG NGHE KHAI THAC flP DUNG DIEU KHIEN Df^ V(iCH BRNG CHEN LO THOY UTC CHO DIEU KIEN VIA 9B, KHU VUC CANH NAM, MO THAN MAO KHE According to the[.]
Thong tin khoa hgc cdng nghg m o w /NGHIEN cOtJ THIET KE CONG NGHE KHAI THAC flP DUNG DIEU KHIEN Df^ V(iCH BRNG CHEN LO THOY UTC CHO DIEU KIEN VIA 9B, KHU VUC CANH NAM, MO THAN MAO KHE According to the evaluation of the geological conditions and coal reserves at Canh Nam area of Mao Khe coal mine, the coal reserves under the surface objects and building constructions needed to be protected is about 23,2 million tons, accounting 31% of the total geological reserves to the level of-400 Using this coal reserves as coal ribs has been considered as the natural resources loss Therefore, study on the proper technological solutions for maximally mining the above mentioned coal reserves and ensunng the safety of the surface objects and building constructions needed to be protected is most necessary TS TRyONG eOc Dy TS [£ £>(!C NGUYEN TS PHAM TRUNG NGUYEN Vidn Khoa hoc Cdng nghe Mo - Vinacomin ThS NGUYEN VAN T U A N ThS NGUYEN ANH T U A N Cdns fy than Mao Khe - TKV Bien tap: TS TrwoTig DCpc Dw Khu dan cu-, 11% Dat vin de Kit qua dinh g l i dieu kien dia chit v l ting hpp tru" lyong khu canh Nam, md M?o Khe [1] cho t h i y trir lypng than nam dydi c i c cdng trinh, dii typng c i n bao ve tren be mat khu vyc (khdng tinh trii' lypng n i m tru bao vp cic phay pha, dirt gay cdng trinh gilng v l sln^ga gilng) khoang 23,2 trieu tan, chilm % tong trir lypng dia chit tinh den mirc -400 Trong dd, trO' lypng than nim dydi cac cong trinh dyang dien cao the chilm ty le 59%, ho chira nydc 14%, khu dan c u - 1 % , moong lp_thien cii - 7% va c i c suoi - 9% ( hlnh 1) Viec d l lal trir lupng than niy lam tru bao vp se gay lang phi tai nguyen lan v l lim giam hieu qua dau ty khai thang, ma via ctia cic dy an mo Do dd, v i n de nghien cu-u giai phap cdng nghe phii hap, vira khai thic dypc toi da t i l nguyen than ndi tren, vira dam bao an toin cho c i c cdng tnnh, doi typng tren b l mat dia hlnh la hit su'c c i n thilt Lo cu,' moong Iq thien Ccic ho nirdc, 14% suoi, 9% Hlnh Phdn bd trU luang than dudi cdc cdng trinh, ddi tirang bi mat khu cdnh Nam md Mao Khe Nham glai quyet v i n d l niy, nam 2011, Cdng ty than Mpo Khd da phoi hop vol Vipn Khoa hpc Ccng nghe IVI6 thye hien Be t i l "Nghien ciru glai CM^u diy via phip c6ng nghe khai thac via day, doc canh Nam - C6ng ty than tJlao KhS", va da dupc Hpi Hlnh Phdn loai trO luang than theo cdc yiu td chiiu ddy, gdc ddc via ding KHCN Tap dpin Cdng nghiep Than Khping s i n Vi$t Nam nghipm thu (2013) B l t i l chen id phii hpp vdi dilu kien d|a chit ky thuat mc khu vyc cinh Nam, md Mao Khe (via diy d l d l xuit c i c sa a l ccng nghe (SfiCN) khai thic dilu khiln d l vIch bang phyang phap trung binh d i n day, doc tren 45°), (hlnh 2) D l KHCNM S 10/2014* CNKT H A M L Thong tin khoa hoc cong nghe mo CO cc so* danh gia kha nang ap dung va mirc dp anh hu'dng den be mat dat cua cong nghe de xuat dieu kien thirc t^, Cong ty than Mao Khe va Vi$n Khoa hpc Cong nghe Mo da ti^p tgc phol hpp lua chon va lap Phu'cmg an ap dung thu" nghiem cong nghe tgi vfa 9b khu Tay Nam, mu-c -80/LV, trinh Tap doan Cong nghiep Than Khoang san Viet Nam xem xet cho phep trien khai cac cong viec tiep theo Do day la loai hinh eong nghe mo'i, du'p'c ap dyng thi> nghiem l^n dau, nen viec thi&t k§ cac giai phap cong nghe can du'pc luan giai khoa hpc bang ly thuyet va thye nghiem Bai bao trinh bay mpt s6 ket qua nghien CLTU thiet k^ eae giai phap eong ngh? cua Phu-cng an cho dieu kien cu t h i khu VLTC dy kien ap dung thCr nghiem Dac digm khu virc ap dung thip nghiem va Iva chpn SOON khai thac Khu vyc dy kiln ap dung thu" nghiem tai vfa 9b, khu Tay Nam, mirc -80/LV, phia Dong giap ranh gidi try bao ve suoi Binh Minh, phia Tay la ranh gipi khu vyc khai thac eu B§ mat dia hinh la khu vyc trai, dan cu' da du'pc di rdi, eho phep thilt lap mgng lu'di quan trac theo dai dieh chuyen, biln dang be mat dat qua trinh khai thac thu" nghiem cong nghe Khu vyc co vj tri thuan \(?'\ cho vi$c cung cap dien, nu'dc va cac nguyen vat lipu khac phyc vu 16 chg thu' nghipm Trong gidi han khu vyc, via 9b co hu'dng cam Nam - Tay Nam, goc die vfa thay doi tir 60 - 75°, trung binh 65°, chilu day via thay doi tCr 3,8 9,5m, trung binh 6,9m Via than co eau tao phdc tgp, vfa eo td - Idp da kep, chieu day a i kep thay doi tir * 2,94m, thinh phin chu yeu la set kit D l vach tryc tiep I I set kit phan Id'p mong tir 0,2 + 0,4m, chieu d i y lop 1,0 + 4,0m Ben tren lap set kit I I Id'p b i t kit ran chae, cd chilu day thay a l l tir 23 * 30m D l tnj tn,fc tilp la lap set ket c6 chieu day thay d i i tir 1,0 ãôã 3,0m, tilp theo la Id'p bpt k i t ran chae, chilu day tir 20 + 25m T i n g trii' lypng dja chat huy dpng I1100.000 tan Tren co sd' phan tich dieu kipn i^a chit ? kJ thuat mo khu vyc I p dung thir nghi$m v l dinh g i l c i c yu, nhyac diem cua mOt so SDCN khai thac dyac de xuit, Phyang an da lya chpn ap dung SBCN khai t h i c cpt d i i thep hud'ng doc, chia top ngang nghieng thep trinh ty tir dypi ien, khiu than bang khoan no min, dieu khien da vIch bang chen 16 toin phin theo phyang phap thiiy lyc SDCN khai thao dypc the hipn tren hinh Sa d l khai thdng chuin bj cua khu vyc dupc thye hipn nhy sau: Mirc thing gid ±0 dypc khai thdng bang cup xuyen via (1) a trung tam khu vyc IVIiro van tai -80 dypc khai thdng bang cac cup xuyen via (3), (3') v l 16 dpc via (4), (4'), (4'') Tai v| tri trung tam khu vyc, dap thypng thdng gid (2) bam try tir id dpc via (4') len ciip xuyin via (1), chia khu vyc khai thac thinh hai canh Ddng, Tiy Tir Id xuyen via (3) v l Id dpc via (4") d i p hpng sap rdt than (5) v l thypng v|n tai than (6") mirc -80/-70 Dao Id dpc via v|n tai (8) mii'c -70 bam tru tir hpng s l o (5) d i n thypng v|n tai (6") Dao d o thypng thoat nyd'c (6) va (6'), M l cup n i l (7) tir Id dpc via (8) b i m tru sang 16 MATCATI-I -Jl WATCATI n ^^ v; /^4-.£->l ,^ /f ^^1^ XT H M • ^ ^ \il '\12' \i ' \u \u \ i AS Hinh SDCN khai thSc chia lOp ngang nghieng, khiu than vS chdn Id theo trinh ti/ tCe du^i ISn KHCNM S 10/2014* CNKT HAM L Thong tin khoa hoc cong ngh# m o thypng thong gio (2) bam vach, day la 16 cit ban 6ku md gucng khai th^c Cdng tac khai thac chia Idp ngang nghieng kit hpp vdi chen 16 toan phan theo trinh ty td du-di len, chieu cao m6i Idp bang 2,2m Trong m6i Idp, vipc khai thac du'p'c tiln hanh nhu- sau: Md 16 khdi diem (12) cua Idp khiu, n6i giOa 16 dpc via van tai bam tm (11) va 16 thu'p'ng thong gio bam vach (2) Td 16 khdi diem bat mep md gu-cng khiu (14) v l bien gidi hai canh Dong, Tay Khiu gu'cng bang cong nghe khoan no min, ch6ng gid 16 chp bang vi chong g6 Trong qua trinh khai thac va chen 16 mdi Idp, chong gid hinh 16 dpc v\a thong gio (13), day dong thdi se la 16 dpc via van tai khai thac ldp tilp theo L6 dpc via van tai (11) mit di theo tiln dp khiu gu-ang C6ng tac chen 16 bang phu-cng phap thuy lye du'pc tiln hanh theo tiln dp 6m (6 luong khau) Khi khiu gu'cng 16 chp den bu'dc chen 16, ddng eong tac khiu chong guang de tien hanh chen 16 Cong tae ehuan bj bao gom chong tang eudnghinh 16 dpc via thong gio (13), dong banh g5 lam c6p pha cho khoi chen, nii dai ong dan vgt lipu chen den vj trf can chen 16 Vat lipu chen du'pc chuin bj ngoai mpt bang va van chuyin bang sdc nu'dc he thong dudng Ing qua cup xuyen via (1), thupng thong gio (2) vao thi eong khii chen Trong qua trinh chen 16 m5i Idp, ching gid hinh cac thupng van tai (10), (10') va thu-png thoat nude (9), (9') khii chen Than khai thac d gu-o-ng 16 che dupc van tai bang m^ng trupl xuing mang cao d 16 dpc via van tai (11) cua Idp va du'p'c xuong cac thupng van tai (10) (10'), sau do, qua cup xuyen via (3) ho|ic 16 dpc via (4") roi dua ngoai Thong gi6 bing ap chung cua mo, gi6 sach td cac dudng 16 (3) va (4") theo cac thuang (10), (10"), 16 dpc via (11) vap thong gi6 eho guang 16 chp hai canh Gio thai td guang 16 chp theo 16 dpc via thong gio (13), thuang thong gio (2) tho^t ngoSi qua cup xuyen via (1) Nudc qua trinh chen 16 thim qua khoi ch6n chay v^o e^c thupng tho^t nudc (9) va (9'), rii theo c^e rSnh thoat nudc d mdc -80 v l him thu nudc, sau Cwtyc bam quy hoi len tren b l chda d$t tai m$t bing +25 "W Nghien ci^u thiet ke cac giai phap cong nghe chen 16 Tren ea sd SDCN khai thae dup'c lya ehpn, Phuang an da xay dung phuang phap luan va tinh toan, thilt k l cac giai phap cong nghe cho dilu kien khu vyc ap dung thu nghiem Trong d6, dang luu y la cac giai phap v l cong nghe chen 16 nhu: lua chpn, gia cong vat lieu chen; van ehuyin vat lieu chen; va cac giai phap c l p thoat nudc 3.1 Nghien cik/ lira chgn vat lieu chen Id phu hffp Vat lieu su dung de chen l i p khoang khong gian da khai thac phai dap dng cac yeu cau nhu: la vat lieu re tien hoac co san, co nguon cung dam bao d l giam t i i da chi phi chen 16; khong dupc ehda cac chit doc hai gay nhiim m6i trudng nudc hoac khong khu vyc khai thac, va khong c6 tinh tu chay; co tinh an m6n thip d i i vdi phuang tien vgn tai chiing nhu dudng ong, bang tai hay may chen 16; khong dinh ket, von eye bao quan Ngoai ra, dii vdi phuang phap chen 16 thuy lyc, vat lieu chen 16 can CO ham luang set khong vupt qua 10% (dl tranh t i e dudng ong va thao kho khii chen tit), va c6 ty le phin cd hat phu hap Cd hpt vat lieu Chen 16 thuy luc thudng khong Idn han 60mm Theo kinh nghipm cua nhieu mo ham 16 tai Nga, Ba Lan, cd hat vat lieu chen thudng d mde thip, td 10 ^ 30mm hoac nho han Ty Ip phin cac hat co kich thudc Idn va nho vat lieu chen can tuan theo ty Ip ve he s i dong diu N = deo/dio > Trong do, deo; dioOudng kinh 16 sang dam bao tuang dng 60% va 10% khii lupng vat lieu Ipt qua Trong thye t l , cac vat lieu ty nhien thudng it thoa man tat ca cac yeu cau noi tren, vay, vpt lipu chen 16 thudng duac gia cong bing each nghiin, sang va tron l i n cac loai vat lipu khac d l tao dupc hin hpp vat lieu chen dpt yeu ciu Tai khu vyc Mao Khe, mpt s i loai vat lieu eo t h i dup'c xem xet su dung d l chen 16 la: cat s6ng, da thai tu qua trinh dao 16, xit thai td eae xudng tuyen than, tro xi tu nha may nhipt dipn khu vye Cat CO nhung dac dilm nhu chiu dupc ap suit cao, CO kieh thudc hpt nho, ding nhit, tinh chat thim thIu t i t , thoat nudc nhanh, khong KHCNM S 1(1/2014* CNKT HAM L w Thong tin khoa hoc cong nghe mo tryang no ngam nyd'c, v l cc tinh tra cap, la loai v|t lieu sach, khdng gay nhilm nguon nyd'c Do dd, cit rit phii hpp trpng viec sir dgng l i m v l t lipu chen 16, dac biet vai phyang phip chen 16 thuy lyc Tuy nhien, hien nguon cung c l p c i t cho Mao Khe chu y l u tir cac khu vyc ngoii nhy Uong Bi, Kinh lydn - Hai Dypng vd'i g i l khoang 240 + 260 nghin dong/m^ Do dd, vipc sil' dung cat lim v|t lipu chen 16 chp khu vyc thir nghiem chya that sy hpp ly d' thirl dilm hipn tai ngudn cung c l p khdng cd san v l cung khdng re D l thai d i e 16II nguIn vat lieu s i n c6 tai md Qua khao sat cho thiy, hing nam lypng d l thai tir c i c gyang d i o 16 d l cua Mao Khe khoang 130.000 tin, duac d l cac bai thai tai V6, V7, V8, cinh Nam Ba thil cd cd' hat lan (100 -^ 300mm), thinh phin chu yeu la bot kit, cit kit typng d i i cu'ng (f = + 10), ty le set v l than thip, cd the sir dung lim vlt lieu chen Viec chen Id bang d l thai khdng nhu'ng giam dyac chi phi mua vat lipu chen, m l cdn gdp phin gial quylt vin de d l thai v l hoin nguydn mdi tryang cho md Tuy nhien, kich thypc v l dp cirng ciia d l lan nen de sii' dung l i m vat lieu chen Id, c i n diu ty diy chuyin thilt b| v l chi phi gia cdng cao, anh huong khdng nhd tai g i l t i n than (dac bipt vdi quy md thii' nghipm cdng nghe) Xit thai tu' c i c xyang tuyen than cung cd nhirng yu diem ve mat kinh t l nhu doi vol d l thii dao Id Tuy nhien, kit qua khao sit cac b i i xit thai va liy mau phin tich phdng thi nghipm cho t h i y da xit thii tai md Mao Khe cd CO hpt tir + 12Cmm, him lypng set cao (18 + 20%), mIm y l u , d l ba rai van chuyin dydng Ing va thi cdng khii chen se cd dp kien c l khdng cao, d i p irng thap cac yeu cau lim vat lipu chen Trpng khu vyc cd Nha m i y nhiet dien Mao Khe, tryc thudc Tap doan Cdng nghiep Than Khoing san Viet Nam, duac khinh thinh v l dya vac hoat dpng tir 4/2013, sir dung cdng nghp dot than ting sol tuin hoan hien dai CFB Tro xi I I san pham ciia q u i trinh ddt than tai Nhi miy, cd c i u tao tu' c i c chit vd ca khdng chiy cd san than vai c i u true d^ng thuy tinh va vd dinh hinh Tro xi gIm tro bay (bay la iu-ng khdi thai v l dypc thu lai nha he thong loc KHCNM S6 10;20I4' CNKT HAIM LO bui tinh dien) va tro diy Hien nay, N h i may dang hoat ddng vo'i cing s u i t tiSu thy khoing 5000 t i n than mdi va thai khoang 2000 tan tro xF/ngly-dem, dd, cd khoang 1400 fin tro bay v l 600 tan tro diy Do tai khu vyc Mpo Kh§ hien tai chya cd nhu cau sii' dgng logi vat lipu niy nen toin bp lyang trp x] tir Nha miy dang dyac thai bai thai, den nay, khoi lypng tro xi tren bai thai da d i n hing tripu t i n Dd danh g i l kha nang sii' dung tro x? cua Nha may lam vat lieu chen Id thiiy lyc, Vien Khoa hoc Cdng nghe Md da khao sat, l i y m l u tai bai thai > v l tiln hlnh thi nghiem K i t qua thi nghiem cho thiy, tro bay cd dp cao, toi xlp, cd' hgt nho tir 0,5(im d i n lOO^m, tro day cd co hpt Idn hpn bay v l nho han 2,5mm Vdi kich thudc hst m|n nhy trdn, dung d|ch tro bay d l van chuyin dyang ong, nhien, vi ca hpt qui nho, thi cdng khii chen bing phyang phap thiiy lyc r i t khd t i c h nyac khdi khii chen, do khdng phii hop de chen id Id chp Tro day cd CO' hpt dyd'l 2,5mm, cd d i e tinh g i n tyang tv nhy c i t sdng, dp t h i m t h i u tit, thpat nudc nhanh va cd dp len chat lan, r i t phii hop vdi phuang phip chen Id thiiy lyc m l khdng can them cdng dopn gia cdng c h l bien Cung dp v|n tai ttr b i i thai d i n v| tri ap dung thir nghidm khong xa, khoang 5,8km Do dd, lya chpn tro d i y tir Nha miy nhiet dien Mgo Khe lam vat ll?u chen id cho khu vyc I p dung thii' nghiem la phii hap 3.2 Tinh toan thiet ke giai phap v$n chuyen vat lieu chen Tro d i y tU' bai thai N h i miy nhiet dien Mao Khe duac dya ve mat bing cira Id mirc +25 cua khu vyc thir nghiem bang dtd, cung van lal 5,8km Tai diy, tro dypc dya vIp bun ke cap lipu v l dypc van chuyin bang sire nyac theo dudng Ing d i n vj tri c i n chen Id Sa he thong chen Id dypc t h i hipn tren hinh Cdng suit yeu c i u cua hp thong chen 16 bang: Qc = Kl x K2 x (Vc - Vg)/T = 38,3 m=/gid Trong dd: Vo - The tich khii chen mdi tiln dp; Vg - T h i tich gd chong khii chen; Kl = Hp s6 khdng diln d i y khoi chen boi v|t lipu chen, K1 = 0,95; Ka - Hp s i dy try tinh den sy khdng dieu hda s i n xuit, K2 = 1,5, T - Thai gian thi cing khii Thong tin khoa hoc cdng nghe m o BuMiet^tei Hinh Sa dd hS thing chSn Id Chen (kh6ng ke thdi gian chuan bj, thu dpn trudc va sau thi cong), T = gid Theo kinh nghipm ap dung chen 16 thuy lyc tai Nga va Ba Lan, ty Ip t h i tich hdn hap vat lieu ch6n ; nude (R:N) thudng nim khoang 1:2 d i n 1:6, thuoc vao tinh chit eua vat lieu, kich thudc v^ phin cd hpt cua vat lieu Mat kh^c, theo gi^o su Bronikov D.M, ty Ip R N eo t h i dupc tinh toan theo cong thuc: cua tro day, theo k i t qua thi nghiem eua Vipn Khoa hoc Cong nghp Mo, pr = 2,61 tln/m^; ZL Tong chilu dai dudng ong van tai; a - Goc doc dudng ong van tai tung doan T u cac c6ng thue tren, tinh toan dupe ty Ip the tich vat lieu chen va nude, (R:N) la 1:3,75 O l danh gia sau han v l ty le (R:N) phu hpp van tai tro day bang dudng Ing thuy lye dilu kien khu vye ap dung thd nghiem, Vien Khoa hpc Cong nghe Mo da tiln hanh thi nghiem tren mo hinh mo phong sa dudng Ing van ehuyin vat lieu chen dilu kien thye te (c6 dudng kinh ong (J)50 mm, ty le theo chilu dai 1:10), vdi eae ty le (R:N) nam dai tu1:1 din 1:6 Kit qua thi nghiem cho thiy, tyip (R:N) bang 1:4 la ty le toi uu, dam bao kh6ng gay t i c dudng ong va tilt kiem nudc Nhu vay, tong quan kinh nghiem nude ngoai, cac kit qua tinh toan ly thuyit, thi nghipm thye t l d i u cho thay, de van chuyin vat lieu chen bang dudng Ing thuy lyc, ty Ip t h i tich tro day: t h i tich nudc (R:N) hp-p ly bing 14 Tren ca sd da xae dinh cong suat yeu eiu cua hp thing chen 16, va ty le tro day: nudc (R:N) hpp ly, tinh toan dupc luu lupng yeu eiu cua ddng chay hin hpp dudng Ing van tai Trong do: Ls = ZH/ ILn - Ty le gida chieu cao bing Qhh = Qe x (R+N).R = 192, m^/gid (IH, m) tu tram c l p vat lipu chen d i n vj tri chen Mat khae, luu lup-ng cua ddng chay hin hpp 16 vdi cung dp van tai theo phuang ngang ( I U , dudng Ing dupc xac djnh theo cong thdc: m) td tram c l p vat lipu chen den vj tri chen 16 Qhh = 3600.V2,TT.D^, m3/gid Trong d6: vi - V|n (hlnh 5); As - He s i sdc can trung binh cua hin tie dong chay thoat khoi mieng ong, m/s; hgp qua trinh di chuyin dudng ong D - Dudng kinh Ing van tai vat lieu chen Van toe V2 dupc xac djnh dua tren phuang trinh can bang nang lupng Beenoulli tai cac mpt ^ la„sma)+I(ffcosa) cit 1-1 va 2-2 (hinh 5), co dang thu gpn nhu sauTrong do: phh - Ty trpng trung binh cua hin hp-p, phh =(Rpr+N)/(R+N), tln/m^; pr - Ty trpng TH = ^ + h^ l.g ^ Trong do: £ - He s i thay d i i dong nang tinh din sy sai khac gida hin hpp vat lieu chen va chit long ly tudng, £ = 1,05; g - Gia t i c trpng trudng, g = 9,81 m/s^; hw - T i n that cpt ap ddng chay tu mat cit 1-1 den mat cit 2-2 Ton thit cpt ap hw bao gom t i n thit ma sat doc dudng va ton thit cue bp Trong do, tin thit eye bp la khong dang ke, do, hw co t h i dupc Hlnh GiSn d6 tinh toSn cSc thdng si he thing xac djnh theo cong thdc Darcy vdi hp so ton thit doc dudng (A) xac djnh theo thue nghiem cua (Sifd/ng ing v$n chuyin vSt liSu chSn tmng thifi diim khd khSn nhit Nikuratse: KHCNM S6 10/2014* CNKT HAM L Thong tin khoa hoc cong nghe m o K, '- (2.lB^+l,74)' Trpng A - Dp nhim tuyet d l l ciia Ing dan, A = 0,1 mm = lO'im Duong kinh Ing van tai v l t lieu chen I I nghiem cua phuong trinh: ZH H,743=DJ Giai phuang trinh noi tren, nhan duac D = 0,122m = 122mm Phuang an da lya chpn dudng Ing van tai eo dudng kinh D = 150mm la phu hpp Ben canh viec xac djnh dudng kinh ong van chuyin vat lieu chen, thilt ke c i n kilm tra van t i c ddng chay Ing Van t i e dong chay c i n Idn han van toe tdi han vkr (la van t i c ddng chay h6n hap bat d i u xuat hien hi§n tupng pha rin tach va rai xuing mat dudi Ing, dan den t i c ong), dong thdi van t i c dong chay qua Idn se lam tang hao mdn dudng Ing Theo Smoldurev A.E, van toe dong chay phu hpp nim khoang (1,1^1,5)vkr Van t i e tdi han vkr dupc xac dmh theo cong thdc y^r = C'^ffgSD = 3,45 m/s thiet qua trinh chen 16, va bilu d l to chdc chu ky san xuit, tinh toan dupc nhu c i u nudc sd dung d l van chuyin vat lieu chen trung binh mot dem bang 1.226 m^/ngay-d^m Sau chen 16, nudc tu khoi chen thoat thupng thoat nudc, chay xuing 16 dpc via mdc -80 va dupc gom ve h i thu nudc Tai day, sau lang dpng, nudc dugc bcm quy h i i trd lai b§ chda d mat bang +25 (hinh 4) Lup-ng nude co the bam quy hoi trd lai b l chda d mat bing +25 dupc xac dinh bang 70% lup'ng nudc sd dyng d l van chuyin vat lieu chen, tuang duang Qqi;, h6i = 858 m^/ngay-dem Bam nudc quy h i i dupc tinh toan cho co t h i bam h i t nudc thai mpt dem vdng ca san xuat, moi ca lam viec gia Do do, luu lupng bam c i n thilt la Qbom.qh s 858/14 = 61,3 m^/gid Hp ap c i n thilt cua may bam d l bam nuac tu ho thu nudc mdc -80 len b l chda +25 bang ap lyc cpt ap tmh dudng ong (Hi = 105m) cpng vdi t i n t h i t ap s u i t gay bdi ma sat cua chit long di chuyin dudng Ing (Hms) Vdi dudng kinh I n g 100mm, chilu dai duong Ing 250m, Hms duac tinh theo cong thtfc Darcy-Weibeck va bang 10m Nhu vay, ap c i n thiet de bam nudc tu h i thu nudc mdc -80 len b l chua tai mat bang +25 la H £ 115m Ti> nhdng tinh toan noi tren, Phuang an da lya chpn may bam co ma hieu MD85-45(SL) d l bam quy h i i nudc Trong do: C"- He so kinh nghiem, C"= 8,5-5-9,5; f - He s i ma sat tong quat cua cac hat pha cung vdi ong, f = 0,5; S - Ning dp pha cung Lupng nudc c i n thiet bo sung vao b l chira dung djch, S = 0,2 Nhu vay, vdi dudng kinh ong D = 150mm, tai mat bang +25 la 368 mVngay-dem Lupng xac dinh dupc van t i e dong chay hin hpp nudc dup'c l i y t u b l chda nudc cua hai h^ ong bang v = 5,2 m/s = 1,5 x Vkr, dam bao hin thing xd ly nude thai BOOm^ va 1200m^ tai m?t hpp chen se khong gay t i c dudng Ing, ding bang cda 16 +17 cua Cong ty than Mao Khe, qua he thing bam va dudng ong d i n nudc Sd dung thdi han chl dupc su hao mon dudng ong 3.3 Tinh toan thiet ke giai phap cap, thoat may bam loai co ma hieu Pentax CM50/125A (hoac loai khac co dac tinh tuang duang) €ac nip&c tinh ky thuat eua cac may bam sd dung cap, Nudc d l van chuyin vat lieu chen dupc c l p thoat nudc cho khu vyc thu nghiem khai thac tu b l chua tren mat bang +25 Luu lupng c i n thilt qua trinh van chuyen vat lieu chen cua chen 16 duac gidi thieu bang Tinh toan cac chi tieu KTKT va ting mpt tiln dp chen 16 la: Qnu