Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceut...Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceutical applications,as well as in industrial applications such as paints,drill muds,packaging,and papermaking.The application of CNF in papermaking is expected to be implemented in the near future to broaden the commercial market of cellulose.Numerous studies and patents have reported on the manufacturing,properties,and applications of nanocellulose.This present paper focuses on the recent progresses in the application of CNF as a wet-end additive in papermaking.展开更多
研究了羧甲基纤维素(CMC)在湿部系统的应用,分析了其对打浆、助留助滤、成纸物理指标的影响。结果显示:浆料中添加一定量CMC后较容易打浆;CMC在湿部系统应用有助于提高细小纤维和填料的留着,但对滤水有不利影响,且当用量超过2kg/t浆时...研究了羧甲基纤维素(CMC)在湿部系统的应用,分析了其对打浆、助留助滤、成纸物理指标的影响。结果显示:浆料中添加一定量CMC后较容易打浆;CMC在湿部系统应用有助于提高细小纤维和填料的留着,但对滤水有不利影响,且当用量超过2kg/t浆时影响较严重;CMC能有效提高成纸物理强度,随着C M C用量的增加成纸物理强度逐渐升高,用量超过1.5kg/t浆后,变化趋缓。综合分析,CMC在抄纸湿部系统的用量为1.5kg/t浆时较合适。展开更多
In light of developments in polysaccharide-based sustainable processes involving supramolecular interactions,we herein present our findings pertaining to coaxing polysaccharide granules into functional supramolecular ...In light of developments in polysaccharide-based sustainable processes involving supramolecular interactions,we herein present our findings pertaining to coaxing polysaccharide granules into functional supramolecular biocolloids.Translucent biocolloidal dispersions containing various forms of starch are facilely designable,essentially built upon complexation between disassembled native cornstarch granules and amphiphilic ligands.Oily moieties of guest molecules are dynamically attractable into cavities of helical structures,with cationic groups pointing toward the bulk phase.This noncovalent attraction can generate core-shell biocolloidal particles.The significantly higher gelatinizability of freeze-dried biocolloids in contrast to native cornstarch granules is attributable to complex formation,and a homogenous dispersion is readily formable at room temperature.Our results also show biocolloids'ligand-related antibacterial activity.The use of biocolloids as wet-end additives for biofiber assemblies(cellulosic paper)can enhance mechanical strength,fines retention,and filler bondability.Supramolecular biocolloids with positively charged,translucent,easily gelatinizable,antibacterial,and polysaccharide-bondable functionalities would find tailorable use in the paper industry.展开更多
针对已经投运的火电机组,设置管道和阀门实现邻机冷端系统互联,充分利用邻机调停备用机组的冷端系统(自然通风冷却塔、空冷塔、空冷岛)以降低运行机组背压,在改动量较小的条件下达到进一步降低机组能耗的目的。本文以600 MW等级机组的...针对已经投运的火电机组,设置管道和阀门实现邻机冷端系统互联,充分利用邻机调停备用机组的冷端系统(自然通风冷却塔、空冷塔、空冷岛)以降低运行机组背压,在改动量较小的条件下达到进一步降低机组能耗的目的。本文以600 MW等级机组的湿冷系统、表凝式间接空冷系统和直接空冷系统3种冷端形式为例,概述了冷端系统邻机互联的技术方案,并计算分析了邻机互联改造后机组额定负荷下的节能效果。结果表明:环境空气湿球温度22.5℃时湿冷机组背压下降0.9 k Pa;环境空气干球温度33℃时表凝式间接空冷机组背压下降9.57 k Pa;环境空气干球温度33℃时直接空冷机组背压下降5.55 k Pa。该结果可为火电机组降低背压、实现节能降耗提供参考。展开更多
基金grateful for the financial support from the National Natural Science Foundation of China(Grant Nos.31770628 and 31901267)the Taishan Scholars Program+3 种基金the Provincial Key Research and Development Program of Shandong(Grant Nos.2019JZZY010326 and 2019JZZY010328)a projectu(Grant No.ZR2019BC042)supported by the Shandong Provincial Natural Science Foundationa project of the Shandong Province Higher Educational Science and Technology Program(J18KA111).
文摘Recently,cellulose nanofibril(CNF)has emerged as a promising,sustainable reinforcement with outstanding potential in material science.Owing to the properties of CNF,it has been explored in food,cosmetic,and pharmaceutical applications,as well as in industrial applications such as paints,drill muds,packaging,and papermaking.The application of CNF in papermaking is expected to be implemented in the near future to broaden the commercial market of cellulose.Numerous studies and patents have reported on the manufacturing,properties,and applications of nanocellulose.This present paper focuses on the recent progresses in the application of CNF as a wet-end additive in papermaking.
文摘研究了羧甲基纤维素(CMC)在湿部系统的应用,分析了其对打浆、助留助滤、成纸物理指标的影响。结果显示:浆料中添加一定量CMC后较容易打浆;CMC在湿部系统应用有助于提高细小纤维和填料的留着,但对滤水有不利影响,且当用量超过2kg/t浆时影响较严重;CMC能有效提高成纸物理强度,随着C M C用量的增加成纸物理强度逐渐升高,用量超过1.5kg/t浆后,变化趋缓。综合分析,CMC在抄纸湿部系统的用量为1.5kg/t浆时较合适。
基金supported by the Fundamental Research Funds for Central Universities of China(2572018CG04)the Natural Science Foundation of China(218708046)+1 种基金the Program for New Century Excellent Talents in University(NCET-12-0811)the Longjiang Scholars Program(Q201809).
文摘In light of developments in polysaccharide-based sustainable processes involving supramolecular interactions,we herein present our findings pertaining to coaxing polysaccharide granules into functional supramolecular biocolloids.Translucent biocolloidal dispersions containing various forms of starch are facilely designable,essentially built upon complexation between disassembled native cornstarch granules and amphiphilic ligands.Oily moieties of guest molecules are dynamically attractable into cavities of helical structures,with cationic groups pointing toward the bulk phase.This noncovalent attraction can generate core-shell biocolloidal particles.The significantly higher gelatinizability of freeze-dried biocolloids in contrast to native cornstarch granules is attributable to complex formation,and a homogenous dispersion is readily formable at room temperature.Our results also show biocolloids'ligand-related antibacterial activity.The use of biocolloids as wet-end additives for biofiber assemblies(cellulosic paper)can enhance mechanical strength,fines retention,and filler bondability.Supramolecular biocolloids with positively charged,translucent,easily gelatinizable,antibacterial,and polysaccharide-bondable functionalities would find tailorable use in the paper industry.
文摘针对已经投运的火电机组,设置管道和阀门实现邻机冷端系统互联,充分利用邻机调停备用机组的冷端系统(自然通风冷却塔、空冷塔、空冷岛)以降低运行机组背压,在改动量较小的条件下达到进一步降低机组能耗的目的。本文以600 MW等级机组的湿冷系统、表凝式间接空冷系统和直接空冷系统3种冷端形式为例,概述了冷端系统邻机互联的技术方案,并计算分析了邻机互联改造后机组额定负荷下的节能效果。结果表明:环境空气湿球温度22.5℃时湿冷机组背压下降0.9 k Pa;环境空气干球温度33℃时表凝式间接空冷机组背压下降9.57 k Pa;环境空气干球温度33℃时直接空冷机组背压下降5.55 k Pa。该结果可为火电机组降低背压、实现节能降耗提供参考。
