TIU CHUN VIT NAM TCVN AMONIAC LNG TNG HP Ly mu Liquid synthet c amoniac Sampling

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Cristiana Teves Prada
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1 TIU CHUN VIT NAM TCVN x іt ln 1. So t AMONIAC LNG TNG HP Ly mu Liquid synthet c amoniac Sampling Ti u chun n єy qui nh c c dng, thit b, v є tr nh t ly mu th nghim ( mu th ) amoniac lng tng hp 1 QUI NH CHUNG 1.1 Tu iu kin v є y u cu c th, mu c th c ly th Єng cha trc khi np hoc b nh cha amoniac lng. 1.2 Mu c ly theo l h єng, l h єng l є lng sn phm c c Єng ch ti u cht lng, c giao nhn trong c Єng mt t v є k m theo mt giy chng nhn cht lng 1.3 Mu amoniac lng c ly bng dng c ly mu chy n d Єng: b nh bom l єm bng th іp khng r hoc b nh Lisenco bng thu tinh( xem h nh v v є iu 2.2, iu 3.2) 1.4 Mu c ly 3 % s b nh nhng khng t hn hai b nh i vi l h єng b і 1.5 Sau khi th nu mt trong c c ch ti u khng t ti u chun th tin hanmhf phn t ch li vi lng mu gp i c Єng l h єng. kt qu phn t ch ln hai l є kt qu cui c Єng. 2.PHNG HNG LY MU BNG BNH BOM 2.1 Nguy n tc: Chuyn mt mu amoniac lng v єo b nh bom bng th іp khng r r t kh v є l єm sch kh T l y mu v єo b nh bom khng bao gi c vt qu 75 % dung t ch b nh bom nhit mi trng 2.2 M y m c thit b Thit b ly mu, bao gm nhng b phn sau: B nh bom ly mu ( xem b nh bom mu h nh 1 ) l єm bng th іp khng r, dung t ch khng nh hn 1 lit, chu c p xut b n trong khng nh hn 3 Mpa( 30 bar) Kim tra th t ch b nh bom bng c ch y nc v єo b nh. B nh bom ly mu phi c hai van kim A v є B ni vi hai ng b n trong, ng th nht s t xung y v є ng kia c mt chiu d єi c th m bo mc an to єn khi y ( xem phn 2 v є iu 2.2.3) B nh bom phi c thit k sao cho d d єng l єm sch v є l єm kh, v є ch tho t ra ca van phi c c i lc khi vn chuyn.

2 Ch th ch: 1.Dung t ch b nh bm ph thuc v єo lng sn phm cn d Єng tin h єnh tt c c c th nghim y u cu 2. Phi th nh thong kim tra b n trong b nh bom. Nu b mt b n trong khng sch, phi ra bng nc, l єm kh, ra mt v єi ln bng axeton tinh khit v є cui c Єng thng kh nit ra sch b nh, v d nh np y nc n p xut khong 3 Mpa ri ngm trong nc H nh 1 Mu b nh bm ly mu ( ) ng ni ( xem h nh 2), tt nht l є bng th іp khng r, c d єi th ch hp, ng k nh trong 5 mm, trong thng xuy n c lp cht van ba ng ( ). ng ni c mi ni c ren, mt mi ni vi van tr n b nh cha amoniac lng v є c i kia vi van A ca b nh bom ( ) Van ba ng ( xem h nh 2 ) lp v єo ng ni ( ). Van c th iu chnh amoniac lng chy c t b nh cha ra ngo єi khng kh hoc v єo b nh bom hoc b nh bom m ra khng kh, trong khi o b nh cha ng li.

3 H nh 2 C H nh v ph c tho thit b lp r p L in c th t C Cn, c th cn ch nh x c n 1 g Bm chn khng, c th nhanh ch ng gim p sut b nh bom ( ) n khong 100Pa B nh bom nit n іn, sch v є kh Chu l єm lnh vi hn hp cacbon dioxit rn ( bng kh) v є tricloetan. Nhit c th xung ti C 35 0 C. Chu c mt nhit k th ch hp 2.3 Tin h єnh ly mu Chun b b nh bom v є ng ni. thc hin c c thao t c theo tr nh t sau: a) Ni ng ni ( ) v єo b nh bom ( ) vi c c van m A,B. Xoay van ba ng ( ) cho nit ( 2/2/5) i qua thit b lp ui khng kh. L єm sch thit b lp nhit ph ng bng c ch np nit v єo. b) Tip tc np nit v єo thit b lp t nht 30 ph t trong l ( 2.2.2) 105 C C ui hi nc qua mt ng eo, th єnh d єy, lun qua mt l th єnh l, ni ng ni vi ( ) c) Th o ng ni ( ) khi ng do th єnh dy cho nit i qua m y v є xoay van ba ng c ch ly m y khi khng kh, m van A v є B ca b nh bom. Ni bm chn khng ( ) vi u ra ca b nh bom ( B) v є h thp p xut b n trong xung khong 100 Pa hoc thp hn. G cho thit b p xut t nht 30 ph t. d) ng hai van A v є B ca b nh bom e) Th o b nh bom khi ng ni v є d Єng cn ( ) cn b nh rng, ch nh x c ti 1g Ly mu L єm ngui b nh bom bng c ch ngm v єo chu l єm lnh trong khong ph t, iu chnh nhit gia -30 v є C, trnhs khng ngng t nc tr n van. Lp ng ni v єo van pha lng ca b nh cha v є ni u k n ca ng ni v єo van A ca b nh bom, xit cht mi ni ( xem h nh 2). Cn phi m van ba ng v єo khng kh trc khi m van ca b nh cha Cn thn m van tr n b nh cha v є cho cht lng chy sao cho khng kh c trong ng ni tho t ra qua van ba ng. cht lng chy t do l єm sch ho єn to єn ng v є van. Xoay van ba ng ni b nh cha vi b nh bom ng mu, m van A tr n b nh bom v є b nh c l єm y bng cht lng n mc an to єn. ng van A v є van b nh cha v є th o b nh bom. Ngay sau khi ly mu phi kim tra lng cha trong b nh bom theo iu Ch th ch : Nu c thit b th ch hp, n n cn b nh bom trong khi l єm y khng phi kim tra s l єm y( 2.3.3) Kim tra s l єm y D Єng cn cn b nh bom dy ch nh x c n 1 g x c nh khi lng mu c t nh n tng dung t ch v є khi lng ri ng ca amoniac lng ( 0,08 g/ml). Nu lng ghi c vt qu lng quy nh, ly bt ch tha nh sau:

4 Ni u ra van B ca b nh bom vi ng do th єnh dy, cn thn m van B trong khi gi b nh bom thng ng, van ph a tr n. cho mt lng sn phm chy ra ngo єi v є ng van B khi ch c hi xut hin Th o ng do ra v є li cn b nh bom ch nh x c n 1 g Ch th ch : thng k kim tra k n ca b nh bom. Tin h єnh hai ln cn kim tra c ch nhau mt khong thi gian th ch hp. 3. PHNG PHP LY MU BNG BNH LISENC 3.1 Quy nh chung : theo iu 1 ca ti u chun n єy. 3.2 Dng c thit b B nh Lisenc dung d ch 200 v є 500 ml ( xem h nh 3) Van v є ng ni vi van tr n b nh cha amoniac lng l єm bng th іp khng r G a bng st c th iu chnh nghi ng ca b nh cha amoniac lng khi ly mu Cacbon tetraclorua CCl 4 ; TKPT; Axit clohidric, dung dch 1:1; Nc ct theo TCVN H nh 3. B nh Lisenco d Єng ly mu amoniac lng tng hp 3.3 Tin h єnh ly mu

5 3.3.1 Mu amoniac lng c ly v єo b nh Lisenco dung t ch 200 hoc 500 ml tu theo th єnh phn x c nh. B nh Lisenco c l єm schj bng cacbon tetraclorrua CCl 4 ; dung dch axit clohidric 1 :1, nc ct v є sy kh trc khi ly mu Ly mu th Єng cha trc khi np v єo chai Cn thn m van th Єng cha v є cho cht lng chy ra th єnh ing n h. cht lng chy t do 1-2 ph t l єm sch muc v є van. Hng cht lng v єo b nh Lisenco, ly n vch mc. y b nh Lisenco bng n t cao su c ng tho t, phn tren un cong 90 0 tr nh amoniac tho t ra ngo єi do bay hi mnh hoc c c cht kh c ri v єo b nh ly mu Ly mu b nh cha amoniac lng B nh cha amoniac lng c t v єo gi ly mu c nghi ng th ch hp sao cho khi m van cht lng chy ra d d єng v є cng vic ly mu thun tin. Lp van v є ng ni vi van tr n b nh cha amoniac lng Tin h єnh cng vic nh iu 3.3.2

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