Umhlinzeki we-Sodium Sulfite eNingizimu Afrika

Iyini i-Sodium Sulfite?

I-Sodium sulfite (Na₂SO₃) iyi-inorganic sulfite salt — usawoti we-sodium we-sulfurous acid (H₂SO₃). Iyi-ejenti yokunciphisa futhi iyi-chemical oxygen scavenger esetshenziswa kakhulu ekuphathweni kwamanzi e-boiler ezimbonini. I-oxygen encibilikisiwe emanzini e-boiler ibangela ukugqwala kwemigodi yama-boiler tubes, izingxenye ze-economiser, kanye ne-feedwater pipework — i-oxygen pitting iyimbangela eyinhloko yokwehluleka kwe-boiler tube kanye nokuvalwa kwezitshalo. I-Sodium sulfite isusa (isusa ngamakhemikhali) i-oxygen encibilikisiwe nge-reaction: 2Na₂SO₃ + O₂ → 2Na₂SO₄, iguqula i-oxygen ibe yi-sulfate ion ngaphandle kokwenza imikhiqizo ebhubhisayo ekucindezelweni kwe-boiler okuphansi nokuphakathi.

Ukususa I-Oxygen Emanzini Okuhambisa Ibhoyila

I-Sodium sulfite ifakwa emanzini okuphakelwa kwebhoyila phansi kwe-deaerator ukuze kususwe i-oxygen encibilikile eseleyo edlula esinyathelweni sokukhishwa kwe-mechanical deaeration (inhloso: nciphisa i-O₂ kusuka ku-~20–50 µg/L deaerator outlet ibe yi-<10 µg/L, okungcono kakhulu i-<5 µg/L). Ukusabela kusheshiswa izinga lokushisa eliphakeme (ngaphezu kuka-60°C) futhi kuqhutshwa yi-cobalt sulfate, evame ukungezwa emikhiqizweni ye-sodium sulfite (i-sodium sulfite ekhulisiwe) ukuze kuthuthukiswe izinga lokusabela ezinhlelweni zamanzi okuphakelwa ezinokushisa okuphansi noma isikhathi esifushane sokuxhumana. I-Sodium sulfite ifakwa ku-7–10× stoichiometric excess ngaphezu kwe-oxygen encibilikile elinganisiwe (ukuhlinzeka ngokusala okungu-20–40 mg/L Na₂SO₃ emanzini ebhoyila, okuqinisekisa izimo ezingenawo umoya-mpilo).

Imikhawulo Yokusetshenziswa Nokusetshenziswa Kokwelashwa Kwamanzi

I-Sodium sulfite ifaneleka kuma-boiler anengcindezi ephansi nephakathi (ngokuvamile afinyelela ku-~60 bar). Uma kucindezela kakhulu, ukubola kokushisa ku-boiler kukhiqiza amagesi e-SO₂ kanye ne-H₂S adlulela kumusi futhi abangele ukugqwala kwe-condensate — ngaphezu kwalolu hlu lwengcindezi, ama-non-oxidizing organic oxygen scavengers (DEHA, erythorbic acid) ayathandwa. I-Na₂SO₃ iphinde ingenise ama-ion e-sulfate ngesilinganiso ngasinye, futhi ezinhlelweni zokuhlushwa eziphezulu lokhu kungandisa umthwalo we-TDS. I-Terracore Chemicals inikeza i-sodium sulfite ezikhwameni ezingama-25 kg kanye nasezikhwameni ze-1 MT, ezisezingeni elilula nezisebenzisa i-cobalt, zokwelashwa kwamanzi e-boiler kulo lonke elaseNingizimu Afrika.