著者

菅井 裕一 佐々木 久郎 高畑 重幸 中 秀男

出版者

社団法人空気調和・衛生工学会

雑誌

空気調和・衛生工学会論文集 (ISSN:0385275X)

巻号頁・発行日

no.123, pp.1-10, 2007-06-05

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秋田県大館市比内町で産出する緑色凝灰岩は建築石材として用いられ,吸湿性や防カビ性などの機能性を有することが定性的に知られている。筆者らは,これらの性質を生かしつつ,より施工性に優れた緑色凝灰岩の粉砕石粒を用いた壁材を開発した。本研究では,その調湿性,化学物質吸着性ならびにカビ抑制作用を検討し,いずれも一般的な塗り壁材である川砂よりも優れていることを明らかにした。とくに,化学物質吸着性については,高機能塗り壁材である珪藻土よりも持続性において優れていることが示唆され,緑色凝灰岩の粉砕石粒が環境性に優れた塗り壁材として利用可能であることが示された。

著者

佐々木 久郎 菅井 裕一 河野 洋之 高橋 孝志 伊藤 大輔 岡部 孝

出版者

石油技術協会

雑誌

石油技術協会誌 (ISSN:03709868)

巻号頁・発行日

vol.76, no.6, pp.522-529, 2011 (Released:2014-01-18)

参考文献数

8

被引用文献数

2 2

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In this lecture, a cold drainage mechanism of heavy oil from sandstone cores has been presented by using immiscible CO2 gas dissolution into the oil. Dissolution curves of CO2 and CH4 gases for Japanese heavy oil were measured using with a PVT apparatus to decide the pressures of bubble point for the gases. CO2 swelling factors of the heavy oil and Oman intermediate oil were measured from surface movements of oil columns placed in a high-pressure cell which was controlled less than 10 MPa for the oil reservoir temperature 50°C. Two oil swelling factors increased with increasing gas pressure, and swelling coefficients were evaluated for CO2 and CH4 gases. The swelling-time curves for an oil column were fitted with the analytical solution of one dimensional gas diffusion derivative equation, and CO2 gas diffusion coefficients in the oils, D(m2/s), were evaluated. The values of D in the heavy oil were presented as 1.1 to 1.6 % of that of the intermediate oil, and the empirical equation for values of D has been presented with function of exponential to API gravity. Based on the observation tests on oil drainage from the sandstone cores saturated with the heavy oil, gas dissolution in the heavy oil does not make any oil drainage, however foamy heavy oil including huge number of micron CO2 gas bubbles, that were generated in depressurization process, effectively contributed to oil drainage out from the cores.

著者

藤井 孝志 菅井 裕一 佐々木 久郎 橋田 俊之 當舎 利行 中尾 信典

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.129, no.12, pp.701-706, 2013-12-01 (Released:2014-12-01)

参考文献数

17

被引用文献数

1 1

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Understanding of interfacial interactions among supercritical CO2 (scCO2), water, and mineral phase is necessary for a precisely prediction of CO2 migration into aquifers. The purpose of this study is to assess the impact of scCO2 on flow property of Kimachi sandstone and Iidate granite in a CO2 rich dense phase i.e., the condition of which scCO2 is expected to displace formation water in the course of CO2 injection. In this experiment, the permeability test for CO2 gas was conducted before and after a CO2 saturation procedure that is filled with scCO2 in pores of rocks. To investigate a mechanical property of rock specimen in the presence of scCO2, the axial strain was also measured using a laser displacement sensor during scCO2 saturation processes. Our results showed that both Kimachi sandstone and Iidate granite samples tested have a more or less decreasing trend of gas permeability with increasing exposure time to scCO2. It was further shown that the axial strain of Kimachi sandstone and Iidate granite increased as scCO2-exposure time increased. Additionally, increases in masses and dimensions of test samples before and after scCO2 saturation processes were clearly observed under atmospheric pressure conditions. It can, therefore be said that Kimachi sandstone and Iidate granite could be capable of swelling and permeability change accompanied by CO2 sorption into their internal structures in the presence of scCO2. Furthermore, the observed significant reduction in permeability cannot fully be explained by two model predictions based on Kozeney-Carman equation and Hagen-Poiseuille law, considering CO2 sorption onto mineral phases. The present results pointed out that CO2 sorption on rocks under geological CO2 storage conditions could have a significantly impact on flow property of rocks during CO2 injection and storage processes.

著者

佐々木 久郎 スサント ベリー アンガラ フェリアン ヨセフサザビィ アミン 菅井 裕一 川村 太郎 児玉 孝雄 松嶋 慶祐

出版者

一般社団法人 資源・素材学会

雑誌

日本鑛業會誌 (ISSN:18816118)

巻号頁・発行日

vol.131, no.8, pp.503-508, 2015

被引用文献数

2

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The development and advancement of new technologies have been considered for carbon fixation and its effective utilization as being indispensable for the achievement of greenhouse gas emissions reduction targets without adversely impacting economic growth in the world. Among such technologies, the one considered to present the greatest potential in terms of both of feasibility and CO₂ reduction, as well as offering a relatively low cost burden, is CO₂ capture, usage and geological storage (CCUS). The costs of CO₂ recovery present a barrier to carry the CCS and CCUS project. Large-scale project models for carbon sequestration, recovery and underground storage that involve the construction of long-distance pipelines have been either implemented or planned in North America and Australia, etc., but such projects are not well matched to the land conditions of Japan. The development of Japanese-style CO₂ sequestration, recovery and underground storage technologies is required that ensures linkage in a compact and high economical way among local area-based CO₂ recovery, storage or fixation processes and also energy supply. In this article, the concept<tt>"</tt> Low-Carbon Smart Cities<tt>"</tt> have been proposed with some technical challenges that can be solved by research developments with including environmental monitoring. This concept is targeted for areas with relatively high population density and where land use constraints are in place. By applying the resulting model to the situation in Southeast Asian countries, which have similar land conditions and also possess coal resources, the aim is to combine and integrate the local environment with the provision of carbon-free energy and realize CO₂ reduction with greater economic efficiency.

著者

孙 强 佐々木 久郎 菅井 裕一 ンゲレ ロナルド

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.137, no.1, pp.17-23, 2021-01-31 (Released:2021-01-29)

参考文献数

25

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In this study, pressure response at A monitoring well in early stage of CO2 geological storage were predicted against pressure build-up at CO2 injector after starting CO2 injection into a deep saline aquifer to design the monitoring well distance from the injector and resolution or sensitivity of a pressure transmitter installed in the monitoring well. The numerical simulations on pressure distributions and expanding CO2 plume front were carried out using a reservoir simulator, CMG-STARS, for the aquifer (10 km in radius, 50m in height) with open boundary under 1,000 m from the ground or seabed level. The ratio of pressure response at the monitoring well against the pressure build-up at the injector have been presented for various monitoring locations (500 to 5,000 m from a injector) and homogeneous and heterogeneous models of horizontal permeability distribution in the aquifer (Base Model and Model 1, 2 & 3) and CO2 injection patters during 100 days (Scheme 1, 2 & 3). It has been presented from the numerical simulation results that the monitoring well radial distance from the injector is recommended to be 2,000 to 4,000 m or less than 1000 m when the resolution or sensitivity of the pressure transmitter is 1kPa or 10kPa, respectively.

著者

佐々⽊ 久郎 張 河猛 サルマワティ 王 永軍 チエ サムニアン ンゲレ ロナルド 菅井 裕一 張 曉明

出版者

一般社団法人 資源・素材学会

雑誌

Journal of MMIJ (ISSN:18816118)

巻号頁・発行日

vol.136, no.9, pp.99-109, 2020-09-30 (Released:2020-09-30)

参考文献数

31

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There is a critical situation that a huge amount of greenhouse gases is emitted into the atmosphere from natural coal fires in underground coal seams and spontaneous combustions in coal piles in the world. To reduce the emissions of combustion gases, such as CO2, CH4, etc., some technical challenges and researches are required related to CO2 flux measurements, developing an effective chemical water-solution extinguishes coal fires and inhibits spontaneous combustion, constructing a numerical simulation model to treat the aging effect in coal heating rate. In this article, firstly, the previous studies were reviewed to explain measurement results of CO2 emission from coal fire/spontaneous combustion fields and the aging model used to simulate coal heating rate. Secondary, a trial development of some chemical solutions has been introduced to inhibit microscopic and macroscopic coal oxidations by forming a gel. Especially, sodium meta silicate solution showed a relatively good performance shifting the critical self-ignition temperature (CSIT) of a low rank coal to be 4 to 5℃ higher than that of water by forming gel with CO2 gases in the air and combustion gases emitted from coals. The brooking effect in macro scale by forming gel is also expected to extinguish coal seam fires by reducing aperture width in fractures connecting to the atmosphere. A numerical simulation using ANSI FLUENT has showed an extinguishing fire process of an underground coal seam including a horizontal fracture that is connected inlet and outlet fractures being air paths for air and combustion gas, respectively. Finally, the the research challenges required for technical developments have been proposed to carry a project extinguishing the coal seam fires and spontaneous combustions of coal piles with reducing CO2 emissions.

著者

菅井 裕一 佐々木 久郎 松葉谷 治 中 秀男 田中 富士夫

出版者

一般社団法人 資源・素材学会

雑誌

資源と素材 (ISSN:09161740)

巻号頁・発行日

vol.121, no.10,11, pp.513-520, 2005 (Released:2007-02-24)

参考文献数

13

被引用文献数

4 6

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The green tuff from Hinai town, Akita is popular for architectural materials because of its beautiful pale green color and thermal and moisture retaining properties. When this stone is quarried and grinded for making products, approximately 60% of all quarried stone becomes the waste stone and it is required to be utilized effectively. Hinai-Green tuff is a porous media and it has abilities to neutralize acids and elute some minerals. These abilities may be effective for growth of microbes and our research group carries out the development of effective utilizations of Hinai-Green tuff as microbial activator. In this paper, the effects of Hinai-Green tuff on pH adjustment and microbial activities are described.Hinai-Green tuff had an ability to neutralize both acid and alkaline water and especially neutralized acids effectivelly. For example, acid water of initial pH3 was neutralized to pH7 by adding 10(w/v)% Hinai-Green tuff into the acid water. Therefore, Hinai-Green tuff can neutralize acid soil and water and adjust acid environments to adaptable environments for microbes. Moreover, Hinai-Green tuff could buffer decrease in pH. The pH of water containing Hinai-Green tuff did not decrease rapidly with adding drops of 0.1M HCl, and especially the buffer action was strongly observed at pH 7 to 8. Hinai-Green tuff is very helpful to maintain pH appropriate for microbes for long time against decrease in pH caused by acid rain and/or acid metabolites of microbes. And pH adjustment effects of Hinai-Green tuff were caused by the ion exchange between Ca2+ leached from the stone and H+.Consequently, microbes grew actively in a medium containing Hinai-Green tuff because of its pH adjustment effects. However, microbes did not grow in a medium containing natural zeolite from Futatsui town, Akita. The effects of Futatsui-Zeolite on pH adjustment for acid were low compared with Hinai-Green tuff.