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研究生:潘正益
研究生(外文):Pan, Jenq-Yih
論文名稱:燃油中硫酸鈉成份對燃燒爐高溫腐蝕和燃氣特性的影響
論文名稱(外文):Influences of Sodium sulfate on High Temperature Corrosion and
指導教授:林成原林成原引用關係
指導教授(外文):Lin Cherng-Yuan
學位類別:碩士
校院名稱:國立海洋大學
系所名稱:航運技術研究所
學門:運輸服務學門
學類:運輸管理學類
論文種類:學術論文
論文出版年:1996
畢業學年度:84
語文別:中文
論文頁數:118
中文關鍵詞:硫酸鈉高溫腐蝕
外文關鍵詞:sodium sulfatehigh temperature corrosion
相關次數:
  • 被引用被引用:2
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  • 下載下載:0
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摘 要

本研究以普通柴油及油包水型( water in oil )乳化柴油為燃料,探討不
同硫酸鈉添加量和大氣鹽份,對於燃燒爐的燃燒狀況、廢氣排放特性及碳
鋼材料( SB 410, SB 450 )高溫腐蝕現象的影響。實驗過程使用一個小型
自製的不銹鋼燃燒室,在油料中添加硫酸鈉,並用乳化均質機攪拌使其均
勻混合,最後由燃燒器之高壓油泵將燃料加壓,噴入燃燒室內霧化燃燒,
以此進行實驗觀測與數據的擷取。 實驗結果顯示,硫酸鈉的添
加量越多,將使燃燒較不完全而減少燃油之熱值釋放因此降低燃氣溫度;
同時也造成高濃度SO2氣體的排放,而增加材料遭酸性燃氣侵蝕與破壞的
機會。另外在大氣含鹽份氣氛下,因氯化鈉本身即具有促進腐蝕反應的特
性,且當硫酸鹽中含有Cl成份時,因這種複合鹽很容易和氧化層形成低熔
點的化合物,而使得開始發生劇烈腐蝕的溫度降低。

此外也發現,燃燒乳化柴油雖具有提高燃燒效率、降低煙灰與氮氧化物的
功效;但因燃燒後產生高濃度氧氣及高溫水蒸汽而有加速氧化反應的現象
,使材料腐蝕加速。甚至將材料表面的保護性皮膜嚴重地破壞,且加深及
擴大晶界上的腐蝕作用和產生孔蝕現象。
Diesel fuel oil A which approximates ASTM No. 2 D oil and its
emulsion of water-in-oil type were used as the test oils to
investigate the influences of the contents of sodium sulfate in
oils and sodium chloride in atmospheric air on the combustion
and emission characteristics as well as corrosion phenomena of
carbon steels. An emulsifying and homogenizing machine was
employed to stir the Na2SO4 powder and the oil to constitute a
homogeneous oil mixture.The oil mixture was thereafter injected
by a oil pump o a small-sized industrial burner, atomized with
inlet air, and burned within a furnace made of stainless steel
in turn. In the case of the consideration of salty atmospheric
air effect, the inlet air adjusted to a 3.0 ppm concentration of
NaCl was ultrasonically vibrated into a fine mist spray before
entering the burner.

The results show that the existence of sodium sulfate in the
oils would incur a less extent of chemical reaction, leading to
decreased heat release and a lower attainable gas temperature.
Larger formation of sulfur dioxide was also observed in the
burning gas. The metallic material was therefore more
susceptible to the attack of higher concentration of sulfuric
acid.In addirion,a complex salt composed of sulfate and chlorine
component would swiftly react with the oxidation layer to
produce a compound with low melting point on the surface of the
materials. The occurring temperature for the serious corrosion
is therefore decreased.

It was also found in this study that the burning of the
emulsified oil with water resulted in the improvement of thermal
efficiency, leading to the reduction of the smoke and nitrogen
oxides formation. However,large release of oxygen gas and water
vapor from burning the emulsions of water-in-oil significantly
promoted the oxidation process of the materials.Distructive
pitting hole failures and deteriorating corrosion phenomena
occurring in grain boundaries which seriously dismantled the
protection of the surface layer were thereafter resulted in the
accelerated corrosion of the metallic materials.
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