Natural gas should be heated and throttled for the purpose of purification and transportation at the first gas production factory of the Changqing field. The safe use and heat-transfer efficiency of a heating-furnace ...Natural gas should be heated and throttled for the purpose of purification and transportation at the first gas production factory of the Changqing field. The safe use and heat-transfer efficiency of a heating-furnace affect the safe and smooth production of natural gas directly. At gas collecting stations now, no measures of anticorrosion have been adopted in heating furnaces which erode and scale badly. In order to solve the corrosive problem of heating-furnaces, prolong operating life of heating-furnaces, assure safe and smooth production of natural gas, the mechanism and influencing factors of corrosion of the heating-furnace were analyzed and some corresponding measures were brought forward based on a field investigation of usage behavior and present operational status of heating-furnaces at the first gas production factory. The results show that the corrosive ion and soluble CO2 and O2 in water erode metal badly at the condition of being heated. Corrosion of a heating-furnace are mostly oxygen corrosion, corrosive ion corrosion, acid corrosion, iron encrustation corrosion, dry and wet interface corrosion, caustic corrosion, etc; The influencing factors of corrosion mainly include soluble O2 and CO2 in water, pH value, heat loading, corrosive ion, soluble solid （salinity） and non-flowing character of water, etc.展开更多
The corrosion mechanism of the S135 drill pipes was investigated through observation of the corrosion morphology and analysis of the corrosion products by scanning electronic microscope （ SEM）, energy dispersive spe...The corrosion mechanism of the S135 drill pipes was investigated through observation of the corrosion morphology and analysis of the corrosion products by scanning electronic microscope （ SEM）, energy dispersive spectrum （EDS） and X-ray diffraction （XRD）. The results show that the localized corrosion on the outer surface of the drill pipes was caused by oxygen corrosion due to the action of retained slurry. Cl - contained in slurry accelerated the corrosion and promoted the development of corrosion pits. Suggestions for mitigating or preventing such corrosion of the drill pipes are proposed based on the research results.展开更多
文摘Natural gas should be heated and throttled for the purpose of purification and transportation at the first gas production factory of the Changqing field. The safe use and heat-transfer efficiency of a heating-furnace affect the safe and smooth production of natural gas directly. At gas collecting stations now, no measures of anticorrosion have been adopted in heating furnaces which erode and scale badly. In order to solve the corrosive problem of heating-furnaces, prolong operating life of heating-furnaces, assure safe and smooth production of natural gas, the mechanism and influencing factors of corrosion of the heating-furnace were analyzed and some corresponding measures were brought forward based on a field investigation of usage behavior and present operational status of heating-furnaces at the first gas production factory. The results show that the corrosive ion and soluble CO2 and O2 in water erode metal badly at the condition of being heated. Corrosion of a heating-furnace are mostly oxygen corrosion, corrosive ion corrosion, acid corrosion, iron encrustation corrosion, dry and wet interface corrosion, caustic corrosion, etc; The influencing factors of corrosion mainly include soluble O2 and CO2 in water, pH value, heat loading, corrosive ion, soluble solid （salinity） and non-flowing character of water, etc.
文摘The corrosion mechanism of the S135 drill pipes was investigated through observation of the corrosion morphology and analysis of the corrosion products by scanning electronic microscope （ SEM）, energy dispersive spectrum （EDS） and X-ray diffraction （XRD）. The results show that the localized corrosion on the outer surface of the drill pipes was caused by oxygen corrosion due to the action of retained slurry. Cl - contained in slurry accelerated the corrosion and promoted the development of corrosion pits. Suggestions for mitigating or preventing such corrosion of the drill pipes are proposed based on the research results.
