{"created":"2021-03-01T06:08:59.601538+00:00","id":5150,"links":{},"metadata":{"_buckets":{"deposit":"0790382d-fca5-4e40-8791-3c4517db24e1"},"_deposit":{"id":"5150","owners":[],"pid":{"revision_id":0,"type":"depid","value":"5150"},"status":"published"},"_oai":{"id":"oai:niigata-u.repo.nii.ac.jp:00005150","sets":["453:455","468:563:564"]},"item_6_alternative_title_1":{"attribute_name":"その他のタイトル","attribute_value_mlt":[{"subitem_alternative_title":"高揮発分燃料の流動層燃焼"}]},"item_6_biblio_info_6":{"attribute_name":"書誌情報","attribute_value_mlt":[{"bibliographicIssueDates":{"bibliographicIssueDate":"2008-03-24","bibliographicIssueDateType":"Issued"},"bibliographicPageEnd":"103","bibliographicPageStart":"1","bibliographic_titles":[{}]}]},"item_6_date_granted_51":{"attribute_name":"学位授与年月日","attribute_value_mlt":[{"subitem_dategranted":"2008-03-24"}]},"item_6_degree_grantor_49":{"attribute_name":"学位授与機関","attribute_value_mlt":[{"subitem_degreegrantor":[{"subitem_degreegrantor_name":"新潟大学"}]}]},"item_6_degree_name_48":{"attribute_name":"学位名","attribute_value_mlt":[{"subitem_degreename":"博士（工学）"}]},"item_6_description_4":{"attribute_name":"抄録","attribute_value_mlt":[{"subitem_description":"This study is about research on fluidized bed combustion (FBC) of high-volatile fuels. The research has been conducted in five chapters. In the first chapter, literature survey concerning to the problems associated with fluidized bed combustion of high-volatile fuel are summarized. Rapid volatile matter (VM) evolution from fuels such as wastes and biomass is one of problems of fluidized bed incinerators and gasifiers. When VM evolves rapidly in the vicinity of the fuel feed point, the mixing of VM with reactant gas is poor thus unreacted matter is anticipated to be released from the reactor. One of the counter measures to solve this problem is by employing porous solids as bed material. The second chapter deals with reduction of VM evolution rate by employing porous solids as bed materials instead of non-porous sand. Effect of bed material on the onset of devolatilization was measured by use of a bench-scale bubbling fluidized bed reactor. VM capture by the porous solids (capacitance effect) and heat transfer rate within the bed, both of which affect VM evolution rate, were also measured. Four types of porous solids, with capacitance effect and without capacitance effect, were employed as bed material. By employing porous solids without capacitance effect, the contribution of reduced heat transfer rate and capacitance effect to the delay of VM evolution can be separately evaluated. For porous bed materials with moderate capacitance effect (VM capture of up to 20%), the delay of the onset of devolatilization, which was measured by detecting the flame combustion of the VM, was well explained by the lower heat transfer between fuel and bed. However, for a porous particle with high capacitance effect (VM capture of 30%), capacitance effect also affected the delay of the onset of flame combustion. The third chapter is concerned with a new method to evaluate horizontal dispersion. A carbon-loaded bed material prepared using the capacitance effect (VM captured by porous particles) is used as a tracer. The tracer particles are identical to the remainder of the bed material, except for carbon-loading of a few weight percent. Two carbon-solid tracers were prepared: using a carbon-loaded bed material with dividing bed using a partition plate, and using activated carbon batch injection. Transient change in the horizontal CO concentration profile is measured in the freeboard and the experimental results are compared with the theoretically calculated results of one-dimensional diffusion of solids. Thereby, the horizontal dispersion coefficient is determined. The experimental results agree with results obtained from the literature. In the fourth chapter of this thesis, a model of combustion and dispersion of carbon deposit on porous bed material during bubbling fluidized bed combustion has been developed. For commercial scale-up purposes, it is important to establish a model in which both carbon deposit (carbon captured by porous bed particles) combustion and horizontal solid dispersion take place simultaneously.","subitem_description_type":"Abstract"},{"subitem_description":"The oxidation rate of carbon deposits was measured by burning carbon deposits with oxygen and measuring the produced CO_2. Based on the burning rate of carbon deposits, a one-dimensional mathematical model of carbon deposit combustion in a bubbling fluidized bed was developed. A two-dimensional mathematical model to predict the horizontal concentration profile of carbon combustion was also developed by taking account of both the reaction rate and solid dispersion. The two-dimensional model was validated through experiments using a two-dimensional fluidized bed combustor by continuously feeding solids with carbon deposits into the reactor. In the fifth chapter, this work is summarized. The works have covered some essential innovations on FBC of high-volatile fuels using porous solids as bed material. The delayed onset of devolatilization is expected to broaden the area of devolatilization in the reactor, thus to avoid formation of local VM-rich zone in the freeboard. A new method has been developed to evaluate horizontal dispersion of solids at high bed temperatures that resemble those of commercial operations. As the first step to scaling-up of the FBC system using carbon loaded solids prepared by capacitance effect, the developed model is considered to be applicable to large-scale BFBCs if the solid dispersion coefficient can be predicted.","subitem_description_type":"Abstract"}]},"item_6_description_5":{"attribute_name":"内容記述","attribute_value_mlt":[{"subitem_description":"新潟大学大学院自然科学研究科","subitem_description_type":"Other"},{"subitem_description":"平成20年3月24日","subitem_description_type":"Other"},{"subitem_description":"新大院博（工）甲第264号","subitem_description_type":"Other"}]},"item_6_description_53":{"attribute_name":"学位記番号","attribute_value_mlt":[{"subitem_description":"新大院博（工）甲第264号","subitem_description_type":"Other"}]},"item_6_dissertation_number_52":{"attribute_name":"学位授与番号","attribute_value_mlt":[{"subitem_dissertationnumber":"13101甲第3025号"}]},"item_6_full_name_3":{"attribute_name":"著者別名","attribute_value_mlt":[{"nameIdentifiers":[{"nameIdentifier":"49771","nameIdentifierScheme":"WEKO"}],"names":[{"name":"ウィナヤ, イ ニョマン スプラプタ"}]}]},"item_6_publisher_7":{"attribute_name":"出版者","attribute_value_mlt":[{"subitem_publisher":"新潟大学大学院自然科学研究科"}]},"item_6_select_19":{"attribute_name":"著者版フラグ","attribute_value_mlt":[{"subitem_select_item":"author"}]},"item_creator":{"attribute_name":"著者","attribute_type":"creator","attribute_value_mlt":[{"creatorNames":[{"creatorName":"Winaya, Inyoman Suprapta"}],"nameIdentifiers":[{"nameIdentifier":"49770","nameIdentifierScheme":"WEKO"}]}]},"item_files":{"attribute_name":"ファイル情報","attribute_type":"file","attribute_value_mlt":[{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-08-05"}],"displaytype":"detail","filename":"D_S_WI.pdf","filesize":[{"value":"6.7 MB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"本文","url":"https://niigata-u.repo.nii.ac.jp/record/5150/files/D_S_WI.pdf"},"version_id":"a5cd5b25-e52e-4669-94da-034981f81dd9"},{"accessrole":"open_date","date":[{"dateType":"Available","dateValue":"2019-08-05"}],"displaytype":"detail","filename":"D_S_WI_a.pdf","filesize":[{"value":"613.1 kB"}],"format":"application/pdf","licensetype":"license_note","mimetype":"application/pdf","url":{"label":"要旨","url":"https://niigata-u.repo.nii.ac.jp/record/5150/files/D_S_WI_a.pdf"},"version_id":"a7ec0901-23ac-4442-947d-62256f31bc8a"}]},"item_keyword":{"attribute_name":"キーワード","attribute_value_mlt":[{"subitem_subject":"fluidized bed","subitem_subject_scheme":"Other"},{"subitem_subject":"volatile matter","subitem_subject_scheme":"Other"},{"subitem_subject":"porous bed","subitem_subject_scheme":"Other"},{"subitem_subject":"combustion rate","subitem_subject_scheme":"Other"},{"subitem_subject":"horizontal dispersion","subitem_subject_scheme":"Other"}]},"item_language":{"attribute_name":"言語","attribute_value_mlt":[{"subitem_language":"eng"}]},"item_resource_type":{"attribute_name":"資源タイプ","attribute_value_mlt":[{"resourcetype":"thesis","resourceuri":"http://purl.org/coar/resource_type/c_46ec"}]},"item_title":"Fluidized Bed Combustion of High-Volatile Fuels","item_titles":{"attribute_name":"タイトル","attribute_value_mlt":[{"subitem_title":"Fluidized Bed Combustion of High-Volatile Fuels"},{"subitem_title":"Fluidized Bed Combustion of High-Volatile Fuels","subitem_title_language":"en"}]},"item_type_id":"6","owner":"1","path":["455","564"],"pubdate":{"attribute_name":"公開日","attribute_value":"2014-08-08"},"publish_date":"2014-08-08","publish_status":"0","recid":"5150","relation_version_is_last":true,"title":["Fluidized Bed Combustion of High-Volatile Fuels"],"weko_creator_id":"1","weko_shared_id":2},"updated":"2022-12-15T03:38:08.522067+00:00"}