Dab tsi yog qhov siab tshaj plaws uas tso cai rau sab nraud (kev sib tw sib tsoo) rau ib qho nyias nyias -Walled Titanium Heating Tube Ib nrab Submerged hauv Lub Nkoj Sib Sib Nqus?
Tso lus
Hauv cov hlab ntsha sib sib zog nqus, xws li cov siv hauv hydrometallurgy, chemical synthesis, lossis hydrothermal processing, titanium cua sov raj tej zaum yuav yog ib feem hauv cov kua dej thaum lub sab sauv raug rau cov pa roj. Lub siab sab nraud ua rau ntawm lub raj yog los ntawm lub taub hau hydrostatic ntawm cov kua (hauv qab cov kua theem) ntxiv rau cov roj siab saum cov kua dej. Nyias- cov phab ntsa titanium cov hlab ntsha tuaj yeem cuam tshuam los ntawm lub zog sab nraud- tam sim ntawd, kev puas tsuaj tsis zoo uas lub raj hla - seem deforms los ntawm ncig mus rau oval lossis flattened. Qhov siab tshaj plaws uas tso cai rau sab nraud (kev ntsuas kev sib tsoo) nyob ntawm txoj kab uas hla, phab ntsa thickness, cov khoom siv, thiab qhov ntev ntawm kev txhawb nqa. Rau ib feem ntawm cov kav dej hauv dej, qhov phem tshaj - cov xwm txheej feem ntau tshwm sim ntawm cov kua theem uas qhov siab gradient siab tshaj.
Mechanism ntawm Collapse Nyob rau sab nraud siab
Thaum sab nraud siab tshaj lub siab sab hauv, lub raj phab ntsa ntsib compressive hoop stress. Rau lub voj voog zoo kawg nkaus, elastic vau tshwm sim thaum lub siab sab nraud mus txog qhov tseem ceeb (P_c) tau piav qhia los ntawm cov qauv classical rau nyias -walled hlab: P_c=(2E / (1-ν²)) × (t / D)³, qhov twg E yog Young's modulus (105 GPatiium) rau Gradeium (0.34), t yog phab ntsa thickness, thiab D yog raj sab nraud txoj kab uas hla. Qhov kev sib tsoo elastic no thim rov qab tau- qhov txo qis rov qab zoo li qub -kom txog thaum lub zog tawm los dhau. Yas tawg tshwm sim thaum lub compressive kev nyuaj siab tshaj cov khoom yield zog (240-340 MPa rau Qib 2). Hauv kev xyaum, titanium raj vau los ntawm kev sib xyaw elastic-yas buckling. Qhov tsis zoo (ovality, phab ntsa thickness variation) txo qhov kev sib tsoo tiag tiag rau 50-70% ntawm tus nqi theoretical.
Quantitative Collapse Pressure rau Common Tube Sizes
Cov kev sib tsoo hauv qab no (piv txwv li 60% ntawm qhov kev xav tau los suav rau qhov tsis zoo) yog tsim rau Qib 2 titanium raj nrog ob qhov kawg capped (sab hauv siab ntawm 1 atm):
| Tube OD × Phab ntsa (mm) | D/t ratio | Theoretical Collapse Siab (bar) | Tso cai Collapse Siab (bar, 60% yam) | Qhov siab tshaj plaws Submersion Depth (meters dej) |
|---|---|---|---|---|
| 20 × 1.5 | 13.3 | 95 | 57 | 570 |
| 20 × 1.2 | 16.7 | 52 | 31 | 310 |
| 20 × 1.0 | 20.0 | 32 | 19 | 190 |
| 20 × 0.8 | 25.0 | 17 | 10 | 100 |
| 25 × 1.5 | 16.7 | 35 | 21 | 210 |
| 25 × 1.2 | 20.8 | 20 | 12 | 120 |
| 25 × 1.0 | 25.0 | 12 | 7 | 70 |
| 32 × 1.5 | 21.3 | 14 | 8 | 80 |
| 32 × 1.2 | 26.7 | 8 | 5 | 50 |
| 40 × 1.5 | 26.7 | 7 | 4 | 40 |
Ib nrab Submerged Tube xav txog
Rau ib lub raj ib feem hauv cov kua nrog roj siab saum cov kua, lub siab sab nraud nws txawv raws lub raj ntev. Nyob rau saum toj (qhov chaw roj), siab sib npaug P_gas. Ntawm cov kua theem, siab sib npaug P_gas. Ntawm qhov tob h hauv qab cov kua dej, lub siab sib npaug P_gas + (ρ × g × h). Qhov phem tshaj - rooj plaub no feem ntau tsis yog qhov tob tshaj plaws tab sis ntawm qhov chaw uas lub siab gradient cuam tshuam nrog kev tsis zoo ntawm lub raj. Rau cov hlab ntsha sib sib zog nqus, qhov qis dua tuaj yeem tawg ua ntej vim qhov siab dua, tab sis thaj chaw hloov pauv nyob ze ntawm cov kua theem muaj kev sib txawv uas tuaj yeem ua rau muaj kev ntxhov siab. Cov lus hauv qab no muab cov kev txwv tsim rau ib feem ntawm cov raj dej hauv qab:
| Vessel condition | Gas Siab (bar) | Qhov tob (m) | Pom zoo Tube OD × Phab ntsa (mm) | Kev nyab xeeb Margin |
|---|---|---|---|---|
| Atmospheric hlab ntsha, kua tob 5 m | 1.0 | 5 | 20 × 1.0 lossis 25 × 1.2 | 3.0x (19bar> 1.5bar) |
| Pressurized nkoj, 5 bar roj, kua tob 10 m | 5.0 | 10 | 20 × 1.5 | 2.8 x (57 bar> 6 bar) |
| Pressurized nkoj, 10 bar gas, kua tob 20 m | 10.0 | 20 | 25 × 1.5 | 1.9 x (21 bar> 12 bar) |
| Siab -siab autoclave, 20 bar gas, kua qhov tob 5 m | 20.0 | 5 | 20 × 1.5 lossis 25 × 2.0 | 2.0 x (21 bar> 20.5 bar) |
| Lub nkoj sib sib zog nqus, kua qhov tob 50 m, atmospheric gas | 1.0 | 50 | Tsis siv tau nrog nyias -phab ntsa titanium; siv 32 × 2.0 | 5 bar max |
Engineering Beyond Collapse Pressure
Internal siab (los ntawm cov pa nyob rau hauv lub rhaub los yog los ntawm cov cua kub ntsiab expansion) ua rau kom lub cev qhuav dej. Ib qho me me hauv siab ntawm 0.5-1.0 bar ho nce qhov kev sib tsoo los ntawm kev tawm tsam sab nraud. Tube txhawb txo qhov ntev tsis txhawb nqa, uas cuam tshuam rau hom buckling. Rau cov raj ntev (ntev> 2 meters), nruab nrab txhawb nqa txhua 500 hli nce qhov sib tsoo siab los ntawm 50-100% los ntawm kev tiv thaiv qhov ntev - wavelength buckling hom. Qib titanium cuam tshuam rau lub cev qhuav dej tsuas yog los ntawm lub zog tawm los; Qib 7 (yield zog 270–350 MPa) muaj 10–15% siab dua cov yas tawg tsis kam tshaj Qib 2 (240–310 MPa). Qhov kub thiab txias txo qhov kev sib tsoo: ntawm 150 degree, E txo los ntawm 15%, txo qhov kev sib tsoo los ntawm kwv yees li 15% ntawm chav tsev- qhov kub thiab txias.
Ua ib qho kev qhia tshwj xeeb
Thaum qhia txog lub titanium cua sov raj rau cov hlab ntsha sib sib zog nqus, xam qhov siab tshaj plaws sab nraud ntawm qhov qis tshaj hauv dej, suav nrog roj siab thiab lub taub hau hydrostatic. Siv ib qho kev nyab xeeb ntawm 3 tiv thaiv qhov kev xav ntawm lub cev qhuav dej (los yog 2 tawm tsam qhov tso cai rau lub cev qhuav dej ntawm lub rooj saum toj no). Rau qhov tob tshaj 30 meters ntawm dej sib npaug, xav txog kev siv phab ntsa tuab (D / t < 15) lossis cov kab me me. Qhia kom meej tias cov raj ua tau raws li ASTM E273 ovality txwv (ntau tshaj 1% ovality rau seamless raj) vim qhov pib ovality txo qhov kev sib tsoo. Thaum lub sij hawm installation, xyuas kom cov raj ncaj thiab sib npaug; dented los yog khoov hlab poob 50-80% ntawm kev sib tsoo tsis kam. Yog hais tias ib nrab submersion tsim lub siab gradient raws lub raj ntev, nruab ib lub me me hauv siab regulator (0.5 bar) kom tswj tau qhov zoo hauv siab sib txawv. Los ntawm kev suav qhov kev sib tsoo kom raug thiab siv cov npoo kev nyab xeeb tsim nyog, tus kws ua haujlwm tiv thaiv tam sim ntawd, kev puas tsuaj lub raj tawg hauv cov hlab ntsha sib sib zog nqus.
