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工業技術研究院

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技術名稱: 鈣迴路捕獲二氧化碳Bench Scale系統技術

技術簡介

利用石灰(CaO)吸收煙氣中之CO2形成石灰石(CaCO3)之碳酸化反應將CO2捕獲,反應溫度約在600~700℃。再將CaCO3經由?燒反應,反應溫度約在850~950℃將CO2排出,此時CO2濃度可達90%以上。利用碳酸化與?燒兩種反應循環操作模式,將CO2捕獲並濃縮為高濃度的CO2。碳酸化反應為放熱反應,所釋出之高溫廢熱可回收再利用,因此較化學吸收法(如乙醇胺),能源耗用低許多。

Abstract

CO2 from the combustion flue gas captured by calcium oxide to form CaCO3 solid in carbonator operated at the temperature of 600-700°C. The CaCO3 solid in calciner where calcination/regeneration reaction taken place at the temperature of 850-950°C, the CO2 capture efficiency will be bigger than 90%. The circulation operation mode utilizes carbonation and clcination to capture and concentrate for high purity CO2. The carbonation reaction is exothermic reaction, the high temperature heat from reaction can be recovered, hence, the energy consumption is lower than that of chemical absorption technology (such as MEA).

技術規格

1.CO2捕獲效率≧98%。 2.碳酸化轉化率≧15%。 3.?燒轉化率≧98%。

Technical Specification

1.CO2 Capture efficiency ≧98%。 2.Carbonation conversion rate≧15%。 3.Calcination conversion rate≧98%。

技術特色

1.CaO捕獲CO2之吸收負載,理論上最高可達0.7857kg CO2/1kg CaO。而實際上在理想狀態下約有0.393kg CO2/1kg CaO,相對其他化學吸收劑來得高許多。 2.雖然經多次循環重複使用後有活性慢慢減弱的現象,但石灰石價格便宜、產地(台灣東部)可以大規模生產並且取得容易,因此可以適時補充新鮮的CaO來維持高的轉化率。 3.CaO Looping設備簡單且可處理大量CO2,目前已經有1.7MWth雙流體化床示範廠興建於西班牙。工研院採用流體化床及旋轉窯反應器,具有放大潛力,2012年將進行1.9MWth示範廠運轉,加速進階商轉。 4.可以取代溼式除硫系統(FGD)同時捕獲SOx 與CO2,沒有傳統吸收程序之限制(氣體組成成分、氣體溫度、氣體壓力、處理量等),產生高純度的CO2可有多種用途。 5.終產物CaCO3可再販售予紙業、建築業或作為區域封存CO2的原料,理論上20萬噸CaCO3可反應掉8.8萬噸CO2。

應用範圍

電廠、水泥業、鋼鐵業、氣化及具有高溫製程所產生煙氣之CO2捕獲

接受技術者具備基礎建議(設備)

電廠規劃、機械設備製造、儀控機電製造

接受技術者具備基礎建議(專業)

能源、環保、機械

技術分類 01 綠能環境

聯絡資訊

聯絡人:周揚震 智慧節能系統技術組

電話:+886-3-5914303 或 Email:chouyc@itri.org.tw

客服專線:+886-800-45-8899

傳真:+886-3-5820017

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