Experiment of limestone dissolution under high CO_2 concentration and high pressure

高CO_2浓度高压下石灰石溶解实验

• 批准号: 17201002
• 负责人: KAYANNE Hajime
• 金额: $ 14.14万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (A)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2007
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17201002/
• 关键词: limestone; calcium carbonate; dissolution experiment; Co_2 seauestration; saturation state; dissolution race; alkalinity; total inoreanic carbon; CO2隔離

The purpose of this study is to estimate limestone dissolution rate by an experiment with high CO_2 concentration seawater reacting with limestone samples under 1 to 100 atm pressure conditions. This is fundamental experiment for technology to isolate CO_2 as hydrogen carbonate ion in the ocean (see the following chemical equation) by neutralization of seawater with injected CO_2 into the coral reef basement rock.CO_2 + CaCO_3 + H_2O → Ca^<2+> + 2HCO^<3->Two experimental devices corresponding to the atmospheric pressure and high pressure conditions were newly developed for this study. The former experiment was prepared preliminary study before the high-pressure experiment, and was also efficient for analysis of an impact of ocean acidification to marine biota with carbonate shell such as foraminifera and corals. The dissolution rate of several kinds of minerals in the shallow marine area is quantified from the experiment and is confirmed to be consistent with the former studies.From th … More e result of the high-pressure experiment, injected CO_2 was confirmed to be isolated in seawater by dissolution of limestone within short time period of about several minutes. In addition, restraint of the acidification of the seawater by CO_2 dissolution and decrease of the CO_2 partial pressure were also confirmed. These results indicate that the CO_2 isolation method using limestone is an effective technique. The efficiency of the isolation by the limestone dissolution was confirmed to decrease when CO_2 partial pressure of seawater was high. We calculated that the CO_2 isolation is the most effective when CO_2 partial pressure is within the range of several to tens percent of the total pressure, and thus the quantity of isolated CO_2 under the CO_2 partial pressure conditions was within an order of 10^<-1> to 100 kg in 1m^3 seawater. In addition, dissolution rate depends on flow speed in reaction vessel, which has not been confirmed in previous studies. This result should give important knowledge for the analysis of distribution and change of CO_2 isolation and limestone dissolution during actual CO_2 injection into underground or underwater limestone strata. Less

本研究的目的是在1 ~ 100个大气压条件下，通过高浓度CO_2海水与石灰石样品反应的实验，估算石灰石的溶解速率。本实验是将CO_2注入珊瑚礁基底岩石中，中和海水，分离海洋中CO_2为碳酸氢根离子（见以下化学方程式）的技术基础实验。CO_2 + CaCO_3 + H_2O → Ca^2++2 HCO ^<3->为本研究新开发了对应于常压和高压条件的两种实验装置。前一个实验是高压实验前的预备研究，对于分析海洋酸化对有孔虫和珊瑚等具有碳酸盐外壳的海洋生物群的影响也是有效的。通过实验对浅海区几种矿物的溶解速率进行了定量研究，证实了实验结果与前人的研究结果是一致的。 ...更多信息 高压实验结果表明，注入的CO_2在大约几分钟的短时间内通过石灰石的溶解而被分离到海水中。此外，还证实了CO_2溶解和CO_2分压降低对海水酸化的抑制作用。这些结果表明，石灰石隔离CO_2是一种有效的技术。当海水中CO_2分压较高时，石灰石溶解的隔离效果降低。计算结果表明，当CO_2分压在总压的百分之几到百分之几十时，CO_2的分离效果最好，因此在CO_2分压条件下，每立方米海水中分离出的CO_2量在10 <-1>~ 100公斤数量级。此外，溶出速率取决于反应容器中的流速，这在以前的研究中尚未得到证实。这一结果对分析实际地下或水下灰岩地层注CO_2过程中CO_2离析和灰岩溶解的分布和变化规律具有重要意义。少

项目成果

Analysis of the seawater-CO, system in the barrier reef-lagoon system of Palau using total alkalinity-dissolved inorganic carbon diagrams

利用总碱度-溶解无机碳图分析帕劳堡礁-泻湖系统中的海水-CO2系统

• 发表时间: 2006
• 期刊: Limnol. Oceanog 51(4)
• 作者: Watanabe;A.;Kayanne;H.;Hata;H.;Kudo;S.;Nozaki;K.;Kato;K.;Negishi;A.;Ikeda;Y.;Yamano;H.
• 通讯作者: H.

Nitrogen fixation of filamentous cyanobacteria in a coral reef measured using three different methods

使用三种不同方法测量珊瑚礁中丝状蓝藻的固氮作用

• 发表时间: 2005
• 期刊: Coral Reefs 24(2)
• 作者: Kayanne;H.;Hirota;M.;Yamamuro;M.;Koike;I
• 通讯作者: I

Dissolution experiment of coral reef sediments using seawater oversaturated with Aragonite

文石过饱和海水对珊瑚礁沉积物的溶解实验

• 发表时间: 2007
• 作者: Terai M.;Kayanne H.;Watanabe A.;Tokoro T.;adaoka K.
• 通讯作者: adaoka K.

Analysis of the seawater CO2 system in the barrier reef‐lagoon system of Palau using total alkalinity‐dissolved inorganic carbon diagrams

• DOI: 10.4319/lo.2006.51.4.1614
• 发表时间: 2006-07
• 期刊: Limnology and Oceanography
• 影响因子: 4.5
• 作者: A. Watanabe;H. Kayanne;Hiroshi Hata;S. Kudo;K. Nozaki;Ken Kato;A. Negishi;Y. Ikeda;H. Yamano

Factors controlling calcification in Shiraho and Palau reefs

白保礁和帕劳礁钙化的控制因素

• 发表时间: 2007
• 作者: Kayanne H.;Watanabe A.;Hata H.;Kudo S.;Nozaki K.;Kato K.;Negishi A.;Ikeda Y. and Yamano H.
• 通讯作者: Ikeda Y. and Yamano H.