KHOA HOC VA C A N E NGHE MO
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\i NGHIEN CUU CAU TAO NHO TRONG CAC GUONG LO
N H A M X A C D I N H H U ^ G DjCH CHUYEN CUA VIA THAN QUn DUT GflV vn CflCH CHO HUONG DHO LO
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ide nghien cuu c i u t^o Idn da dup'c ung dung trong cdng tac tim kilm thdm dd, cdn nghieu cdu cdu t$o nhd trong cac mo nhdm xdc djnh hudng djch chuyin eua v l d Vi§t Nam chira dugc p h i biln.Ddu hidu eo ban cua dut gdy Id su cd mat cua ke ndt truprt vd su khde bidt theo eOt dia ting cua ddt da a hai cdnh cua mat trupl. Nhung ke ndt Idn dugrc phdt hidn mOt cdch dS dang, cdn nhung ke nut trung binh vd nhd thudng dup^c phdt hidn d Id via. Phdt hidn kjp thdi cac dut gdy cdnp sdm cdng dam bao an todn va hi#u qua kinh kd trong khai thdc md.
Cdc ddt gdy kiln t90 nho khi phat hien ra ddu hieu a guong Id phai k i t hcrp vdi cdc tai li#u dja chat thu thdp dirp'c trong ttidm dd va khai ttiac tiing cac phuonng phdp hinh hgc d l xac djnh ttidnh phdn t t i l ndm va 6d ldn cua nd.
c i u tnJc hidn tai cac khu md 6 Viet Nam noi Chung, b l ttian Quang Ninh ndi rieng Id san phdm cua qud trinh biln dang do hoat dpng cdc pha kiln t90 qua cac ttidt ky khac nhau gay ra.
Qua cdc phinmg phap nghien cdu c i u tao t)iln d^ng nhd da ducrc Gido su Vo Nang Lac tdrig hprp td cdc nghidn cdu cua minh kit hprp kit qua n^iidn ci>u cua cac nhd da chdt trdn t h i gidi da dua ra cdch xdc Anh cdc thii cdu tao nho.
Gido su SOt}dlevski. CHLB Nga (S dua ra cdc d i u hidu cua ddt gay nhd trdn ca sd dd d l xdc dnh vung ddt gdy, Khi cd ddt gdy cdc v l se tM (fich ctwyin vi vdy cdn phai tim phutmg phdp cho hirdng ddo td sang v l bt djch chuyin.
Cdc khe ndt thd che phdn bd nhilu d hai canh.
Tnrang dng xudt cue bd d canh tao ra hai nhdm khe nurl cdt M$( nhom gdn song song vdi m ^ cdt ldp cdn m$t nhom tao vdi mdt cdt ldp m$t gdc phgn. Nhoni ktie ndt cdt thd ha 'a ca sd tao ra cac pd che pttd. Ndu cdc ktie ndt cdt nay cd dich
PGS.TS. N G U Y I N X U A N THUY Trwdng D^i hgc Md-Dja chit
chuyin lam cac vdt chit tdi kit tinh thi se hmh thdnh loai thd che chay, chung phan dnh trinh dO biln dgng d muc eao han.
Tnrdng dng xudt cgc bO d cdnh nip u l n Id ngudn gle t$o ra dut gdy trong trudng hprp ndn dp manh vd nip u l n c i t trong cdc nip uln tuong t(r cdnh r>lp uln se thu mong va tgo ra dut vd, tgo ra cdc ddt gdy. Cdc dut gdy sinh kdm chu yiu xuit hidn d cac nip uln ding tdm, phuang cua ddt gdy thudng song song vdi mdt trge thuOc loai ddt gdy nghjch chdm hodt ddt gdy ngang.
Trong thuc t l thudng hay gdp cdc loai ddt gdy;
thudn. nghich. truprt bdng vdi cdc t h i nim khdc nhau (tu thoai din ddc dur>g) cung vdt phuang ddn ddi cua nip uln. Cdn cd vdo ddc dtim ptidn t>l khdng gian cua cdc tryc ung suit trong qud trinh thdnh tgo ddt gdy, cd t h i chia ra cdc kilu trudng dng suit tuong dng.
Cac dng xudt phd huy ddt da n i u khdng du manh gdy ndn djch chuyin tuong ddi cua hai each hinh thdnh ddt gdy thi cd t h i gdy ra cdc nut ne, nhung ddi pha huy.
Nhung d i u hi^u ca ban d l phdt h i ^ dut gd/
kiln tao nhd vd each cho hudrig dao Id sang / I bi dich chuyin:
Nhdng ddu h t ^ ca t>an cua ddt gdy Id » / cd mat cua ke ndt trupt /a s j^ khdc bidt theo cdt (Tia tdng cua ddt da d hai canh cua mdt truTt *."-.Ong ke ndt \dn dup'c phdt h.en vr.tx cacr. ce ^lar.g cdn nhdng ke ndttrur^ tinh vd nho tr j a r g d j a c priat Nen d 16 via hay d l5 khoan thdm-So i>i s . ' c
Khi CO ddt gdy thi cac t s ' ^ dd* da a ra. bdn dJX gay khdrvg pf-: hap vdi nhau c i - trdc da c^it cC^-g khdng lien k i t t r a ' ^ mot krd cac OZ' ddl da uxrarng bj g an ica.n
Dd-.. '--e- de ^hdn ra su zra -"ca dca- ta^g *r khoa'' thdm dd b l s.-g a cdc ,5 iCrcar gdp *s: ^ j t 0(emti^ trang 27}
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KHOA HOC VA CONGNGHE MO
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3. Harve,K. (1998). Studies on controllability analysis and control structure design. PhD thesis.
NTNU Trondheim.
4. Michael A.Johnson & Mohammad H.Moradi, PID Control, New Identification and DesignMethods-Printed In United State of America.
5. Shinkey, F.G.(1994), Distillation Control. 2 ed ..McGraw-Hill Book Company.
6. Shinnar.R. (1997). Chemical reactor ,modelling for purposes of controller design.
Cheng.Eng.Commun. pp. 73-99.
7. Skogestad 8., Postletwaite I. "Muitivarlable Feedback Control.", John Wiley, 1996.
8. Nguyin Phi^ing Quang, Matlab & Simulink lanh eho ky su dilu khiln tu ddng, Nhd xuat ban khoa hpcvd ky thu^t, Hd Npi, 2002.
Ngwoi bien tap: Dao Die T90
The paper presents some important aspects to management of distillation Jcolumns;;' including studies,. on structure
| a n d controller, design for them. Influence iJactors tojtheproduct quality are surveyed^
f^and compared with the different structures.
.(yThe research was done through the {simulation to the multi-component
distillatiqn . column and the .reader can tapply these results in practice in order to i m p r o v e ; quality control .as well as f efficiency of the distillation columns.
NGHIEN CUU CAU TAG NHG...
(Tiep theo trang 49)
truot ho0e gdp Idp d i t dd khong ddc trung. Khi dd dja ting dit da theo mlu lo khoan se khdng theo thd tu binh thudng.
Phdt hi#n dut gdy kiln tgo trong qud trinh thdm dd dia chit d Id khai thdc dua vdo mpt s i diu hi$u sau:
• N I U vdch (hode try) cua via djch chuyin tuang dli mdt dogn ndo dly so vdi vj tri ban diu thi cd thi phdng dodn cd ddt gdy (khi cd d u tgo uln nip cQng ed hi§n tuong tuang tu nhung via khdng bi gidn doan).
• N I U chiiu ddy via khdng biln doi md tu nhidn gu ng gd ggp dd (trudng hop Id theo via) thi ehdc chdn Id dd ggp m$t trupl eua dut gdy.
*:* Chiiu day via d guang Id giam din theo tiln dp cua Id thi ed thi via bj mdt tn^pt d t . Tnidng hop nay phdi thdm dd b l sung vi cd t h i via bj bdo mdn hay bdp lgi do gin din chS kit thue.
• Khi Idp dd vdeh (ho0e tn,j) xuat hi$n su thay dli d u tgo thdnh phin Id bdo hi$u ed thi gdp ddt gay.
• Via vd ddt dd lln trong via ddt ngdt bj nhdn nhd, gip nip Id diu hi$u sip g$p mdt tarpl.
• Su thay dli tinh trgng than yd dit dd xung quanh (tdng dd rgn ndi, eua cdc khdi dit dd vd, vd ndt) Id tjdo trudc chdc chin cd dut gdy.
• Nhdng vit tm-Qt chl tiip gidp than vd dit dd chi eho ta biit Id trong vting ed dCrt gay.
• Ke ndt thi hi$n rd su phdn chia cde khii kiln tnic dut gdy.Ke ndt ed thi khdng ldn, nhung than vd dit dd xung quanh bj d t gidn dogn Id diu higu c6 ddt gdy.
Khi cd dut gdy djch ehuy^ d n phai xdc (Tinh hudng djch chuyin d l tim v l bj mit. cho hudng ddo Id sang v l dd trdn quan dilm an todn vd kinh t l nhit.
Vl chua xdc djnh duoc bi§n dd trupt cua dut gdy nen tren vdc ta djch diuyln ta lly mpt dilm bat kj ril ke dudng thing song song vdi mdt d t tuyin cua v l vd mdt trupl ta se xdc ^nh duoc d t tuyin cua v l bj mat vd mdt tm-gt, tren ca sd dd ta se xdy dung duoc dudng dong muc cua v l bj mat. Cd t h i xay ra hai tardng hop:
<* DUt gdy tach rdi cac v l bj gian dogn;
• Dut gdy nghjch cdc v l chong len nhau.
Trudng hpp thu nhit: Id md theo hudng ndm ngang, di song song vdi dudng phuang cua mdt truot, ding thdi cdch m$t truot mpt khoang (phg thude vdo dO Idn cua dut gdy) d l dam bao Id di trong dd khdng bj anh hudng do phd hogi kiln tgo
Tnj-dng hpp thu hai: Id md tiieo hudng ndm ngang vd vudng gdc vdi dudng phuang cua via.G
TAI LIEU THAM K H A O
1. Vd Ndng Lgc. Clu tgo nhd vd su dgng trong edng tdc dja chat. Hd Ndi. 1992.
2. Nguyin Xudn Thgy. Hinh hpc md. Nhd xuit ban Xdy dung. 2002.
Ngwoi biin t0p: Vd Trgng HCing
ne paper introduces some ideas of study small structure in driving face to determine the direction of .coal strata"
movement in real conditions. Basing on that, paper's author shows the method to define the driving direction for underground construction.
CANGNGHl|PM6si4-2013
