Refinery Flue Gas Dew Point Corrosion Threat To Production Equipment Teeb meem teb Thiab daws

Flue gas dew point corrosion is a serious problem faced by refineries. In the refining process, a variety of fuels such as natural gas, waste gas, liquefied petroleum gas, naphtha and fuel oil are burned through thermal processes. Most of them contain sulfides such as H2S, mercaptans and thiophenes, which are easily converted into SOx in the combustion chamber. Especially SO2, and a part of it (usually 2-4%) is further oxidized to SO3. When the flue gas is cooled below the acid dew point, SO3 condenses with water vapor to produce sulfuric acid: SO3 (g) + H2O (g) ->H2SO4 (l). Cov kua qaub dew point kub nyob ntawm qhov concentration ntawm sulfides hauv cov pa roj thiab feem ntau yog nyob rau hauv qhov ntau ntawm 100-150 degree .

Sulfuric acid yog corrosive heev thiab muaj kev cuam tshuam loj heev ntawm cov khoom siv. Piv txwv li, thaum lub cheeb tsam kub ntawm qhov txias saum npoo ntawm cov hlau cua preheater poob qis dua cov kua qaub dew point, sulfuric acid pib condense, accelerating tus nqi corrosion ntawm daim hlau thiab cov hlab. Qhov no corrosion tshwm sim yog hu ua txias chaw corrosion. Thaum pib, qhov degradation no yuav tsis pom, tab sis dhau sijhawm, kev txhim kho corrosion tuaj yeem ua rau cov khoom xau tuaj yeem ua rau luv luv ntawm huab cua combustion thiab flue gas. Qhov no txo ​​cov kev ua haujlwm rov qab thiab ua kom lub zog siv hluav taws xob ntau ntxiv ntawm cov kiv cua combustion, uas ua rau lub zog poob. Thaum cov kiv cua combustion tau ncav cuag nws qhov txwv, cov xau no yuav cuam tshuam rau kev tsim khoom.

Txawm hais tias qhov ntsuas kub tag nrho ntawm cov roj flue tau khaws cia ntawm 250 degree, qhov tshwm sim hu ua qhov chaw txias tseem tshwm sim vim huab cua txias nyob rau sab nraud ntawm huab cua preheater. Qhov no overcooling ua rau qhov kub ntawm flue gas sab saum npoo kom poob qis hauv qab cov kua qaub dew point. Cov qib sib txawv ntawm cov ntsiab lus sulfur nyob rau hauv cov roj yuav ua rau kom qhov mob ntawm qhov chaw txiasflue gas dew point corrosion. Ntxiv sulfur cov ntsiab lus ua rau kom nce acid dew point. Txawm hais tias lub refinery teeb tsa lub hom phiaj ntawm kev tswj hwm 10-20 degree saum toj no cov kua qaub dew taw tes, qhov hloov pauv ntawm cov ntsiab lus ntawm cov roj sulfuric acid tuaj yeem ua rau sulfuric acid condense thaum lub sij hawm sulfur peaks, yog li ua rau kev puas tsuaj rau cov khoom siv ruaj khov thiab txo qhov zuag qhia tag nrho kev ua tau zoo ntawm cov nroj tsuag.

Yog li ntawd, kev tswj tau zoo thiab txo qis ntawmflue gas dew point corrosionyog ib qho tseem ceeb rau refineries. Kev siv cov kev tiv thaiv tsim nyog thiab kev soj ntsuam cov thev naus laus zis, xws li kev siv cov kub kub flue gas acid dew point meters, ntsuas qhov dew point kub ntawm sulfuric acid, thiab optimizing cov txheej txheem tsis tuaj yeem txo qhov tsis zoo ntawm corrosion thiab tswj lub sijhawm ntev. lub sij hawm ruaj khov ua haujlwm ntawm cov khoom siv.