High temperature desulfurization using a new macroporous lime particle

使用新型大孔石灰颗粒进行高温脱硫

• 批准号: 09650859
• 负责人: NAKAGAWA Hiroyuki
• 金额: $ 2.18万
• 依托单位: KYOTO UNIVERSITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 1997
• 资助国家: 日本
• 起止时间: 1997 至 1998
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-09650859/
• 关键词: High temperature desulfurization; Macroporous lime particle; predesulfurization; H_2Sの除去; マクロポーラス脱硫剤; 石灰石

High temperature removal of H2S is a key technology for developing advanced power plants such as IGCC and the Topping-Cycle. The lime particle of about 1 mm in diameter is a candidate of adsorbents for the desulfurization, but only the outer surface of the particle can be utilized because the CaO particles has only micropores. The micropores are easily plugged when CaO is converted to CaS, preventing H_2S from penetrating into the interior of the particle. This drawback will be overcome if the lime particle with a large amount of macropore is prepared.From this viewpoint, we tried to prepare several macroporous CaC from lime or Ca(OH)_2-water slurry by the following methods : (a) the lime particles pulverized under 10um were pressed and sintered in steam for 10 min at 900 。C ; (b) mixture of Ca(OH) 2-water slurry and several organic acids were heated up to 900 。C ; (c) the lime particles pulverized under 10p.m were heated up to 900 。C with a small amount of CaCI_2. All the samples prepared were crushed and sieved to get CaO particles of 1mm in diameter. The CaO particles prepared had a large amount of macropore with around 0.8mum in pore diameter. Then, we performed desulfurization of H_2S and SO_2 using the macroporous CaO at 900 。C.The CaO particles prepared by methods (a) and (b) were converted to CaS completely within 20 min or so. The desulfurization rate was correlated well with the macropore volume in the CaO particle. Thus it was clarified that the proposed method was effective to prepare the macroporous CaO particle having high desulfurization performance.

H2S的高温去除是开发高级发电厂（例如IGCC和Topping-Cycle）的关键技术。直径约1 mm的石灰颗粒是脱硫化的吸附剂的候选者，但只能使用粒子的外表面，因为CAO颗粒只有微孔。当CAO转换为CAS时，很容易插入微孔，从而防止H_2s穿透粒子的内部。如果制备了大量的大孔的石灰颗粒，将克服此缺点。从该角度来看，我们试图通过以下方法从石灰或Ca（OH）_2-水浆液中制备几个大孔CAC：（a）在10um下粉碎的石灰颗粒在10um下粉碎的石灰颗粒在900中的蒸汽中固定在蒸汽中10分钟。 （b）将Ca（OH）2水浆液和几种有机酸的混合物加热至900 c； （c）将下午10点以下粉末的石灰颗粒加热至900。C，用少量的CACI_2加热。所有制备的样品被压碎并筛分为直径为1mm的CAO颗粒。制备的CAO颗粒具有大量的大孔，孔径约为0.8MUM。然后，我们使用900时的大孔CAO对H_2S和SO_2进行了脱硫。C。通过方法（a）和（b）制备的CAO颗粒在20分钟左右的时间内完全转换为CAS。脱硫速率与CAO颗粒中的大孔体积很好地相关。澄清的是，所提出的方法有效地准备具有高脱硫性能的大孔CAO颗粒。