KHOA HOC VA CONG NGHE MO
Dir BAO DO CHQ^A KHI VA THOAT KHI METAN CUA CAC VLA T H A N MO M A O K H E
6 DO snu KHni THRC KHnc NHAU
ThS. N G U Y I N V A N THjNH, PGS.TS. OANG VU CHI, ThS. N G U Y I N C A O KHAI - Trwdng Dai hgc Md-Dja chit NCS. NHLf VIET TUAN - Vien Khoa hgc Cdng nghe Md-Vinacomin KS. NGO HOANG NGAN - Cdng ty TNHH 1 TV than Khe Chim 1 ^ hi me tan dugc danh gia la khi nguy hi§m
j \ nhat trong cac mo than khai thae hSm 16, va
"^ ^ dac biet nguy hilm d6i vdi c^e mo dugc xip sieu hang vi khi me tan nhu mo than Mao Khe, nam 1999 tai mo than Mao Khe da xay ra vu no khi me tan lam 19 nguai chit. D l cd nhu'ng bien phap phong ngii-a hieu qua, tranh xay ra chay n6 khi me tan, b^i bao da dua ra nhii'ng du bao do chira khi va thoat khi me tan cua mo than Mao Khe a cac dp sau khac nhau.
1. Du bao do chiea khi me tan trong via than khi khai thae xudng sau
Dp chLca khi cua cac via than Mao Khe noi ri§ng cung nhu b l than Quang Nmh noi ehung chju anh huang ddng thai eua nhilu yiu t l khae nhau.
Duang nhien, dd chCra khi n^y chu yiu phg thuoc vao loai than Trong qua trinh khai thae, dp chi>a khi me tan chju anh huong cua qua trinh khai thae c^c via ian can, kiln tao dja chit nhu phay pha, dirt gay . Trong pham vi bao eao nay ehi giai thieu k i t qua xac djnh do chua khi me tan lan nhit cua tifng khu vuc via than a mo Mao Khe.
Qua trinh du bao dp chua khi me tan eac via than Mao Khe dugc tiln hanh nhu sau: Tren ea sa k i t qua xac dinh do ehua khi eua via than tai cac diem khao sat a cae muc khac nhau trong nSm va cac k i t qua khao sat trong cac nam trudc tiln hanh thilt lap m i i quan he xu hudng bien thien d6 chira khi vdi d6 sSu via than. Ham biln thien nay cd dang parabol hoae dang dudng thing. Can cu vao cac ham xu hudng biln thien dp chua khi nay ta cd t h i tinh dugc dg chi>a khi d do sau t i l p theo cua via than va day la CO sd di dy bSo d0 ehua khi cua tCrng khu vgc theo chilu sau cua via than.
CONG NGHIEP MO sd 5 - 2 0 1 3
Tif sd lieu khao sat dp chua khi metan, kit hap vdi cac sd lieu khao sat trong khudn khd Du ^n cua Trung tSm quan ly khi md than Vi$t Nam: "Quy hoach tdng t h i phan loai md theo d p khi nd d l phat triln nganh than viing Quang Ninh" eho phep thilt lap dugc cae ham biln thien dd chua khi theo ehieu siu cua cac via than.
Kit qua du bao dugc t h i hien trong c^c Bang 1, Bang 2, Bang 3, Bang 4 va Bang 5 cung cac bilu dd blln thien kem theo
Bang 1 .Di/ bio dd chda khi metan - Via V9bD Chi^u sSu vEa
30 3 -12 -25 -80 -100 -150
GiatneCK, m'/TKc
0,105 0,327 0,551 0,733 0,928
Gia tri du- b^o DCKm=/TKc '
-
1,046 ,:
1,243 Bang 2. Du bao do chira khi metan - Via V9B Chieu sau
via 40 30 20 3 -5 -25 -80 -100 -150
Gia tri DCK, m'/TKc
0,000 1,404 1.926 3,139 4,341 5,129 5.904
Gia tn du- b^o BCK m'/TKc
-' '
5,994
7,842
KHOA HOC VA CfiNG NGHE MO J 2 ^
Bing 3. Di/ bio dd chira khi m§tan - Via V9T Chieu
sau via
-200
Gia tri BCK.
m'/TKc
5,250
Gia tri du* bao BCK, m'fTKc
7,528
6,86210,8i
14,195Bang 4. Du bao do chO'a khi metan • Via V7D
Chi^u sauvia 30 6 -25 -80 -100 -150
Gia tri BCK, m^/TKc
0,001 0.920 2,217 3,097
Gia trj du' bao, I m'/TKc
3,467 4,176
Bang 5. Di/bao do chira khi metan - Via VGDtVIR
Chilu sau via 30 20 -10 -25 -80 -100 -150
Gia trj DCK, m'/TKc
0.128 0.274 0.343 0,731 1,037
Gia tri du' bao II BCK m'rTKc
1,191 1,486 1
00 o: 04 06
f - ^ - t
ti'^.-.
BO 100
'Iffee;,-
i-1.2 Biiu dd xu hu&ng biin thien - Via V9D
Z'
Z'
.Z. . I. . _ _ ^ . . . . i ^ _ . ; , _ : . _ : , : . . ; . : . L . ^ . ; . J . , : , . . . : . . : . : . . : . . . . : . . : . ; . .
- • - - - i - ^ ^ ^ ^ ^ - ^ - ' ^ - i ^ : ;
::^.;;:;ii: z2>^!^^^
.|..|.|..
H.3. Bieu do xu hudng bien thien - Via V9T 00 05 10 15 20 ?5 30 'J 5 40 * 5
0
so 60 00
•100
140
:;:::;:;:::::
H
H.4. Biiu dd xu hudng bien thien - Via V7D
G
•JO
Pll
0 2 o a 0 6 0 8 1 1 3 1 4 1 6
. . ^ * 5 L 1 5 | ^ . ... ,.. _ ... ;...:. . . . . ; . : . . . . ^ . . : . ; .
: : : /••'''"' --•;.•• /•'.-'•:
• • • • - • - ^ - ^ = * - L t * / - • ' • ' • -
; J G O ^ • •.-.•• . - . - - - • . - . - > - .
H.5. Bieu dd xu hudng bien thien - Via V6DMR
H.l. Biiu di xu hirdng biin thien- Via V9bD H.6 Biiu do xu hudng biin thien Id cha V9T(-150/-80)
CONG NGHIEP MO SD 5 - 2 0 1 3
KHOA HOC VA CdNG NGHE MO
2. D I P b a o d o t h o a t k h i v a o c a c k h u v u c s e k h a i t h a o
Tren t h i gidi hien nay co n h i l u p h u o n g phap tinh toan d u bao do thoat khi, n h u P h u a n g phap tai cac n u d c Tay A u theo Shulza, Wintera; P h u o n g phap thdng ke cua Lien X d (cu); P h u a n g phap cua Vien Skoezynki; p h u a n g p h ^ p d u bao d d thoat khi v a o Id c h g ciia "md thCf nghiem Barbara "(Ba Lan).
Moi p h u a n g p h ^ p tren ed mdt each xae dinh khac nhau, n h u n g qua nghien c u u cae p h u a n g phap ta nhan thay p h u o n g phap d u bao dp thoat khi me lan vao cac d u d n g 16 khai thae eua " m d t h u c nghiem Barbara "(Ba Lan) la u u viet va phO h g p h a n ea. V i p h u a n g phap nay xac dmh ngudn gdc thoat khi me tan vao d u d n g Id khai thae tCf than m d i khau, tif mat Id g u a n g Id c h g , tif cac Id e h u i n bi (Id eh§n va Id d i u ) va tif cac via lan can.
P h u a n g phap tren chu y i u d u a vao dd c h u a khi metan t u nhien eua via dang khai thae, eua eac via I i l n k l trong pham vi ed anh h u d n g t d i qua trinh thoat khi vao Id c h g .
Cae thdng sd e i n t h i l t cho d i u vao d l tinh d u bao dp thoat khi cho Id khai th^c g d m .
• D d ehua khi m d tan cua via dang khai thae (Wwe), m'/TKc;
• D o ChCfa khi me tan cua via n l m tren via dang khai thae (Wwg), m^/TKc;
• D o c h i f a khi m e tan cua via n l m d u d i via dang khai thae (W^d). m^/TKc;
• C h i l u dai Id c h g (Ls), m,
• T i l n do Id c h g (P), m;
• C h i l u d^y via dang khai thao (me), m;
• C h i l u day via n l m trdn via dang khai thae (mg). m,
• C h i l u day via n l m d u d i via dang khai thae (ma), m, _
• He sd tai h i p thu cua via dang khai thae (he);
• Ty trong cua than via dang khai thae (ge), t/m^
• Ty trong cua than via tren via dang khai thae (gg). t / m ^
• Ty trong cua than via d u d i via dang khai thae { g d ) . t / m ' ; .
• Hd sd t i l n g u a n g (C), m;
• Khoang each gitra via dang khai thae v d i via tren (a), m;
• Khoang each giCra via dang khai thae v d i via d u d i (b), m;
• H d so phu thuOc v ^ o gdc d i e cua via (Gg, Go)
• San l u g n g khai th^e, T/ng-d;
• C h i l u rdng tang k h i u cua Combai (Z), m;
• T h d i gian chong mot b u d c ehong (t), phut;
• L u g n g khi thoat ra tif than khai thae d Id c h g (V,), m % h u t ;
• L u o n g khi thoat ra tCF be mat g u o n g Id c h g (V2), m^/phut;
• L u g n g khi thoat ra tCf via d u d i via dang khai thae (V4,6), m > h i j t ;
• T d n g l u g n g khi metan thoat ra (Vm), m^/phiit;
• T d n g l u g n g khi thoat ra t i n h theo he sd t i l n g u o n g (Vmr), m^/phiit,
• L u g n g khi thoat ra tir khu v u c da khai thae (V7), mVphut;
• D o thoat khi metan tuyet ddi thoat vao Id chg (Vme), m > h u t .
V d i n h i f n g t h d n g so v l Id c h g , k i t h g p vdi k i t qua khao sat xac dinh dp c h u a khi metan nam 2011 va cac nam t r u d e d d , cac k i t qua d u bao dd c h u a khi khi xudng s § u trong cac via than, sir dyng p h i n m i m t i n h toan d u bao dp thoat khi me tan vao Id c h a , t i n h t o ^ n d u bao dd t h o ^ t khi cho Id c h g V 9 T ( - 1 5 0 / - 8 0 ) .
Bing 6. Kit qua tinh toan di/ do thoat vao 16 chaV9T(-150/-80)
Chieu sau via 30 20 -10 -25 -80 -100 -150
Gia trj BCK, m%Kc
0,128 0,274 0.343 1,037
Gia trj dy bao' DCKm'/TKc
1:191 :
1,486 1
V i du Lo c h g V 9 T (-150/-80): P = 1 ; L,=195;me=3,a2;ge=1.56; W„e=7,6: h,=54,9; gp=0,0004;
mg=2,2, g g = l , 5 7 ; W „ g = 1 , 7 9 ; a=100: Gg=1,57; ma=0:
gd=0; W„a=0; b=0; Ga=0; 635=3,8; 64 6=1,0; C=1.24;
V i = 2 , 6 6 3 ; V2=0,221; V3 5=0.415; ¥45=0; Vm=3,299;
V m r = 4 , 0 9 1 ; V 7 = 0 , 8 1 8 ; V m e = 4 . 9 0 9 ; San iu'ong, T/nga=400; Q, m 3 / T n g a =17,672.
3. K 4 t l u a n
Tir n h i i n g l(§t qua do dac tru'c tiSp tai mo va iiet qua phan tich cho thJiy a t i t cac via nghien ci>u a n h i i n g m i r c n6ng do chi>a l(hi va thoat l(hi me tan it h o n a cac m t i c s a u va d y bcio cang xuong s§u do chira l<hi va thoat khi m e tan cang tang l§n va tSng manh m e h a n i<hi l<hai thae o- n h i i n g m i r c n6ng. Tir day mo than Mao KhS c6 nt\mg ki hoach ioai trir sir nguy hiSm ciJa M\i mS tan p h i i h o p di dam bao an toan khai t h a c . n
TAI LIEU T H A M K H A O 1. Quy c h u i n k j thuSt Q u o c gia v 4 an to4n trong
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