Hauv Titanium Tube Bundle Heater Reboiling 10% Diethanolamine (DEA) daws ntawm 110℃rau Gas Sweetening, Hydrogen Sulfide (H₂S) Yuav Ua Li Cas Loading (0.1 vs. 0.5} mole/mole) Hloov tus nqi ntawm Titanium Sulfide (TiS) Hydrogen Formation thiab Risk?

Nyob rau hauv 10% diethanolamine ntawm 110 C nrog H 2 S loading, titanium tsim ib txheej titanium sulfide (TiS) rau saum npoo. Nrog rau kev thauj khoom ntawm 0.1 mole / mole H2S, TiS txheej yog nyias (0.1-0.5 µm) thiab tsis tiv thaiv hydrogen uptake. Kev nqus dej hydrogen yog 20-50 ppm / 1,000 teev. Cov txheej ntawm TiS yog tuab (1-3 µm) thiab tiv thaiv ntau dua ntawm 0.5 mole / mole ntawm H2S loading. Hydrogen absorption tus nqi poob rau 5-15 ppm tom qab 1,000 teev. Cov txheej sulfide ua haujlwm los tiv thaiv hydrogen ingress. Tab sis rau tawg (los ntawm tshav kub cycling) txheej hydrogen absorption nce.

Mechanism ntawm Kev Tiv Thaiv Sulfide Txheej

Ti + H 2 S → Ti S + H 2 Hydrogen sulfide cuam tshuam nrog titanium. TiS txheej yog semiconductor thiab tej zaum yuav tiv thaiv thaum ntom thiab adherent. Tus nqi ntawm kev tsim khoom nce nrog qhov concentration ntawm H₂S. The dense and continuous TiS layer acts as a barrier of atomic hydrogen recombination sites and restricts hydrogen ingress.

Quantitative H2S Loading Hydrogen Uptake

H₂S Chaw thau khoom (mole/mole) TiS Txheej Thickness (µm) H Absorption (ppm/1,000 h) Lub Sijhawm rau H 200 ppm (hrs)
0.05 0.05-0.1 50-100 2,000-4,000
0.1 0.1-0.5 20-50 4,000-10,000 0.25 0.5-1.0 10-20 10,000-20,000 0.5 1.0-3.0 5-15 13,000-40,000 1.0 2.0-5.0 3-8 25,000-65,000
H 2 S Loading Guide rau DEA Reboilers

H 2 S Loading (mole/mole) Hydrogen Embrittlement Risk Pom Zoo Qib<0.1 High Grade 7 0.1-0.3 Moderate Grade 7 0.3-0.7 Low Grade 2 or Grade 7 >0.7 Qib 2 Tsawg heev
Specification hauv Kev Paub

The greater H 2 S loading (0.3-0.7) is for DEA/H 2 S service titanium reboilers and enhances the creation of a protective TiS layer that minimizes hydrogen absorption. The benefit of sulfide passivation can be taken keeping H 2 S loading >0.3. Tus kws tshaj lij tswj kev thauj khoom ntawm H2S kom tsis txhob muaj hydrogen embrittlement.