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 ディンディウェ チャールズ 安達 毅

出版者

The Mining and Materials Processing Institute of Japan

雑誌

資源と素材 : 資源・素材学会誌 : journal of the Mining and Materials Processing Institute of Japan (ISSN:09161740)

巻号頁・発行日

vol.117, no.7, pp.604-612, 2001-07-25

参考文献数

17

被引用文献数

1

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In this paper, a new concept for final pit shape in open pit design, Best Positive Inverted Truncated Cone (BPITC) algorithm, is presented for feasibility study and basic scheduling. Five mineral deposit models were used for eventual surface mine design optimization. Initially, geological reserve models were simulated by the utilization of GSLIB using randomly and regularly spaced drill hole data. Effects of varying anisotropy on the obtained metal quantities in reserves were also investigated. The BPITC was successfully applied to 100-times simulated deposit data set using Geostatistical simulation code GSLIB. The optimization results by BPITC were compared with those obtained by Positive Moving Cone (PMC) and Dynamic Cone (DC) based algorithms for the same mineral deposit models. The obtained results indicate that BPITC is superior to all the other optimizers. Concequently, the frequency distribution curves of profits and pit incremental feature by BPITC give effective information on mineral project decision-making and mining sequencing respectively.<BR>The conclusions from this study are summarized as follows:<BR>1. It was proved that for any type of deposit, the usage of correct anisotropic factors used in GSLIB lead to correct evaluation of reserves.<BR>2. All the profits / benefits computed for all the five model deposits show that a newly developed scheme named as BPITC can always indicate optimal solutions for final pit designs.<BR>3. Conclusively, the frequency distribution curves of profits and pit incremental feature by BPITC give effective information on mineral project decision-making and mining sequencing, respectively.

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.

著者

宮腰 宏 今井 忠男 佐々木 久郎

出版者

秋田大学

雑誌

一般研究(C)

巻号頁・発行日

1992

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地下空間は,地上の空間に比較し,その潜在的特性である恒温性,放射線遮断性,耐振動性などの特徴を有する。しかしながら,地上との換気経路が限定されるため,その閉鎖性が欠点として挙げられ,災害や火災などの事故対策の十分な検討を行う必要がある。これらのことから,地下空間の通気および換気状況の把握は,安全工学上重要と考えられ,地下空間の形状・容積等と換気係数との関係は空間の基礎設計資料となりうるものであり,数値計算による予測解析における妥当性の判定資料としても必要である。本研究においては,地下風道ネットワークに接して配置され,片側換気状態にある地下空間の漏洩ガスの対流拡散状況をモデル実験によって明らかにし,数値差分法による予測解析モデルの妥当性を調べた。その結果,換気流と密度の異なったメタンなどの可燃性ガスあるいは有害ガスが漏洩した状況下での,空間の形状,容積を種々に変化させ,総合的な地下空間内のレイヤ形成,3次元ガス対流拡散現象および換気特性を実験的に明らかにした。また,地下空間内の換気流量,換気回数,換気流の特性,ガス濃度の変動・周波数特性,非定常的なガスの漏洩に対する応答特性を調べ,地下空間の換気制御に必要なデータを総合的に示した。また、差分法による漏洩ガス対流拡散の数値シミュレーションを実施し,実験値との比較検討を行った結果,正方形に近い空間形状は比較的実験に近い結果となるが,浅い場合や深い空間形状の複雑なガス対流拡散状況に対しての相違が大きいことがわかった。