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公司新聞

工藝簡(jiǎn)介和高溫高壓反應釜腐蝕情況

來(lái)源: 時(shí)間:2013-08-09 10:40:28 瀏覽次數:

高溫高壓反應釜調漿后的溶液,通過(guò)加入質(zhì)量分數98%的濃硫酸(通過(guò)攪拌和物料的酸解反應.溶液中硫酸質(zhì)量分數保持在5%~8%),利用高溫高壓鈣在酸性條件下,其電離常數隨H含量的增高而增大的特性,在硫酸存在的溶液中產(chǎn)生復分解反應
高溫高壓反應釜調漿后的溶液,通過(guò)加入質(zhì)量分數98%的濃硫酸(通過(guò)攪拌和物料的酸解反應.溶液中硫酸質(zhì)量分數保持在5%~8%),利用高溫高壓鈣在酸性條件下,其電離常數隨H含量的增高而增大的特性,在硫酸存在的溶液中產(chǎn)生復分解反應,生成難溶于水的硫酸鈣沉淀,而將高溫高壓游離出來(lái),溶于溶液中。反應方程式。
  反應產(chǎn)物中有硫酸鈣沉淀,屬不可逆反應,因此高溫高壓鈣可以完全分解。酸解高溫高壓反應釜,在2004年10月份投入使用,型號為2.4mx4.2m。設備為夾套反應容器,鍋體內筒材料采用SUS316L不銹鋼板,厚度12rain;降溫外套為SUS304(0CrI9Ni9)不銹鋼板,厚度8mm,內筒設計溫度<65℃,使用冷卻水時(shí),物料反應溫度為75~80cc
  經(jīng)現場(chǎng)檢測和分析,在遠離加硫酸管(2in)及酸解鍋底部,設備壁厚≥l0.5Film,表面無(wú)凹坑現象,原酸解高溫高壓反應釜厚度12mm.腐蝕厚度≤1.5mm,腐蝕類(lèi)型為均勻腐蝕,主要為物料磨蝕造成的。腐蝕率:0.167mm/a,設備材質(zhì)耐腐蝕性能較好。我公司采用在物料表面加98%硫酸,且為直管直接加到物料表面,硫酸流加過(guò)程飛濺到設備壁上引起腐蝕(在同樣高度處攪拌軸腐蝕嚴重.表面呈現凸凹不平,還存在毛刺現象)。
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