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Search Results: 1 - 10 of 249039 matches for " 张冰剑 "
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汽油调合调度优化
冰剑,华贲,陈清林
化工学报 , 2007,
Abstract: 采用连续时间建模方法,建立了一种新的汽油非线性调合和调度集成优化的混合整数非线性规划(MINLP)模型,克服了当前在油品调合调度中采用线性调合模型或者将非线性调合过程和调度分开优化的缺陷。针对建立MINLP模型的特点,将原MINLP问题转化为求解一系列的混合整数线性规划(MILP)模型,避免了直接求解MINLP模型的复杂性。最后以某大型炼油企业为例,验证了模型和算法的实用性。
反应蒸馏生产乙酸酯工艺研究进展
胡松,陈清林,冰剑
化工进展 , 2010,
Abstract: 反应蒸馏为可逆反应的反应/分离过程设计提供了一个极有吸引力的选择,尤其是对酯化反应和醚化反应。概述了乙酸与C1~C5醇的酯化反应、反应动力学、相平衡,重点介绍了应用反应蒸馏耦合强化过程生产乙酸酯相关的催化剂和工艺流程的改进和开发进展,并对其发展前景作了展望。
考虑蒸汽优化的工艺装置间热进出料
冰剑,吴升元,陈清林
化工学报 , 2011,
Abstract: 工艺装置在回收产品等热物流的热量预热进料或其他冷工艺物流中,利用夹点之下的热量适当增产蒸汽,提高装置能量回收效率。热进出料作为装置间热集成的重要方法,不仅减少了上下游装置总公用工程消耗量,而且能够通过合理改变上下游装置的夹点位置和总组合曲线趋势,优化装置生产蒸汽的压力等级和流量。基于夹点技术构建涉及热进出料物流的温焓线和工艺装置的总组合曲线,通过反转并平移热进出料物流的温焓线确定最高的热出料温度,同时考虑不同压力等级蒸汽对热量需求的差别优化蒸汽生产参数。提出的工艺装置热进出料及蒸汽平衡优化应用于渣油加氢和催化裂化装置的热进出料优化,结果表明不仅降低了上下游装置总公用工程量,而且提高了工艺装置生产蒸汽的品质,增加了能量回收利用效率。
火积传递方程及其应用
王松平,陈清林,冰剑
科学通报 , 2009,
Abstract: 火积是描述传热能力的物理量,在热量传递过程中伴随火积的传递,热量在传递过程中守恒,火积并不守恒,因而火积必定有其独特的传递规律.基于火积定义及其传递的思想,导出了描述多组分黏性流动体系(包含热传递、对流、质量传递和化学反应过程)的火积传递方程,它描述了该体系传热过程中火积的传递规律.给出了火积流及其火积耗散的表达式,并分析了其物理机制.进而讨论了火积传递方程在稳态对流传热过程中优化传热的理论和方法,从不同侧面应用稳态过程传递方程得到了火积耗散极值原理和最小热阻原理,给出了对单组分体系稳态对流传热和稳态导热过程应用的例证.
共沸蒸馏在化工生产中的应用与研究进展
胡松,冰剑,佘志鸿,陈清林
化工进展 , 2010,
Abstract: 共沸蒸馏为共沸物或相对挥发度接近于1的非理想物系的分离过程提供了选择。介绍了蒸馏残余曲线图的热力学原理,并以反应蒸馏生产乙酸乙酯工艺为例说明了蒸馏残余曲线图在流程设计等方面的应用。分别从夹带剂选择、过程设计、过程集成强化、过程控制等角度阐述了共沸蒸馏过程相关理论研究进展;在应用方面,主要综述了乙醇、异丙醇稀溶液、稀乙酸等脱水及回收利用情况,共沸蒸馏过程强化反应蒸馏、变压共沸蒸馏、共沸蒸馏耦合膜分离研究进展情况以及反应蒸馏工艺的局限性,并对其未来的发展前景作了展望。
基于分馏塔总组合曲线进料位置与进料状态的同步优化
Simultaneous optimization of the feed location and thermodynamic feed conditions for a distillation column based on column grand composite curves

刘雪刚,冰剑,陈清林
- , 2016, DOI: 10.16511/j.cnki.qhdxxb.2016.24.020
Abstract: 为降低精馏塔冷热公用工程总费用,该文采用分馏塔的总组合曲线(column grand composite curve, CGCC)对精馏塔进料位置与进料状态进行同步优化。基于实际接近最小热力学状态(practical near-minimum thermodynamic condition, PNMTC)的CGCC可由2条理论曲线即全塔精馏线与全塔提馏线构成,2条曲线的交点O既为精馏塔的理论最优进料点,又为进料预热的分割点。以精馏塔冷热公用工程费用节省量为目标可先确定交点O的位置,再结合焓差值ΔHn, def,可定量确定精馏塔的最优进料位置,最终达到同步优化进料位置与进料状态的目的。该文以苯-甲苯塔为例,其冷热公用工程费用最大节省量为 1.24 RMB/h,对应的最优预热量为1.98 MW,焓差值ΔHn, def为0.038 MW,对应的最优进料位置为第21块塔板。基于CGCC方法计算的最优进料位置和进料状态与Aspen Plus模拟软件结果相同,误差仅为1%~3%,表明此方法准确可行。
Abstract:The study used the column grand composite curve (CGCC) method to simultaneously optimize the feed location and feed conditions for a distillation column to reduce the total utility costs. The CGCC method based on the near-minimum thermodynamic condition (PNMTC) can be decomposed into two theoretical curves for the overall rectifying and overall stripping curves. The intersection point O of the two theoretical curves is not only the ideal feed point, but also the partitioning point for the amount of feed preheating. The total cost of the cold and hot utilities is used as the objective function to optimize the feed preheating and to identify the intersection point location O. The optimal feed location in the distillation column is then found using the enthalpy difference, ΔHn, def, between the intersection point and the actual feed point. The feed location and the feed conditions are then optimized using the CGCC curves. A benzene and toluene column was used to evaluate the accuracy of this graphic method. The maximum savings for the cold and hot utilities is about 1.24 RMB/h. The feed preheating is 1.98 MW and the enthalpy difference, ΔHn, def, is 0.038 MW. The optimal feed location is the 21th stage. The CGCC results compare well with Aspen Plus results with differences only 1%-3%.
脱落酸通过影响生长素合成及分布抑制拟南芥主根伸长
冰剑,森磊,曹萌萌,王志娟,李 霞
中国生态农业学报 , 2014,
Abstract: 脱落酸(ABA)在介导植物生长发育及逆境响应中发挥重要功能,但ABA抑制根伸长的机制尚不清楚。本文以拟南芥为材料,通过研究ABA对拟南芥根伸长的影响以及ABA受体突变体根发育表型的鉴定,探讨ABA抑制植物主根的机制。研究发现:ABA能够抑制主根生长及伸长,并且经典受体PYR1/PRL介导了ABA抑制根伸长的过程;ABA能够改变细胞周期蛋白CycB1;1::GUS表达模式,并影响根中生长素分布和响应。结果表明,ABA可能通过影响生长素在根部的分布和剂量,进而影响根尖分生区细胞分裂,从而抑制根伸长。
润滑油糠醛精制过程液液平衡及物性估算方法
何昌春,汪勤,雷杨,刘雪刚,冰剑,陈清林
- , 2016,
Abstract: 提出了一套采用虚拟组分法来估算润滑油糠醛精制过程中的物理性质和液液平衡的方法。虚拟组分的物性参数由物性实验数据拟合得到,这些参数可满意描述润滑油及其分离物的密度、比重、折光率及含硫量,且可推广应用到其它平均沸点下的润滑油。利用物性估算得到虚拟组分的分子量,液液平衡数据的质量分数可转化为摩尔分数,进而可用NRTL活度系数模型回归计算,最终可应用于工业实际中的润滑油糠醛精制抽提塔的模拟。该估算方法与文献结果相比,在关联的结果上具有一定优势,对于密度、比重和折光率而言,该估算方法得到平均绝对偏差均小于文献偏差的0.5倍,而对于预测结果,两种方法的偏差基本相当。另外,按此方法估算得到的虚拟组分性质更加合理可信,可为模拟工作提供可靠的基础数据。
黄柏山国家森林公园生态旅游资源评价
Evaluation of the Eco-Tourism Resources of Huangbaishan National Forest Park
 [PDF]

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International Journal of Ecology (IJE) , 2015, DOI: 10.12677/IJE.2015.41002
Abstract:
在对黄柏山国家森林公园进行调查和分析的基础上,选择环境资源和景观资源两个层面,18项指标,构建生态旅游资源评价指标体系,运用层次分析法确定各评价指标的权重,计算各评价因子的评价指数,得出的综合评价指数为76.6175,表明该地环境资源和景观资源较好,具备生态旅游开发的有利条件。最后,本文提出了在旅游开发中应加强对生态资源的保护,实现森林资源可持续利用。
Based on investigation and analysis of the Huangbaishan National Forest Park, 18 indexes are chose to establish a ranking the eco-tourism resources evaluating system, and evaluate the eco- tourism resources of the Huangbaishan National Forest Park. The weight percentage is decided by analytical hierarchy process. The composite evaluation index is figured out as 76.6175, which suggests that the environment resource and landscape resource are better and have the favorable conditions of eco-tourism development. Finally, the paper proposes that it should strengthen the protection of ecological resources in the tourism development to achieve the sustainable use of forest resources.
喷射沉积多孔材料楔形压制工艺的研究现状与发展趋势
Status and Development Trend of Wedge Pressing Technology for Spray-Deposited Porous Materials
 [PDF]

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Material Sciences (MS) , 2015, DOI: 10.12677/MS.2015.55027
Abstract:
楔形压制技术是一种基于多道次局部小变形累积致整体成形实现大尺寸喷射沉积多孔材料的致密化的先进工艺。本文综述了喷射沉积多孔材料的致密方法,对比了楔形压制与其他传统致密方法,说明了采用楔形压制工艺的优势和必要性;分别介绍了喷射沉积方形件、环形件与管形件楔形压制的原理、技术特点及研究应用;分析了楔形压制工艺存在的一些局限性;展望了楔形压制技术的发展趋势,认为梯温楔形压制的温度梯度控制精度有待提高;环形件楔形压制的致密均匀性和压制工艺有待进一步深入研究;管形件楔形压制则在压制效率和压制后管坯的尺寸精度有待提高;楔形压制工艺应拓展到其他形状坯料的致密或预成形,也不应局限于坯料的致密,可发展为成形工艺,拓展楔形压制的应用范围。
Wedge pressing is an advanced densification technology for compressing spray-deposited porous preforms of large scale by accumulating deformation as to integral forming. Densification method of spray deposited porous materials is introduced. Wedge pressing is compared with traditional compressing methods to reflect superiority and necessity of wedge pressing adopting. Principle, technical characteristics and research utilizes of wedge pressing are introduced separately, and limitations and development trends of this technology are analyzed. It is considered that control accuracy of temperature gradient of temperature gradient wedge pressing should be improved; compact homogeneity and compact process of ring billet should be investigated further; and compact efficiency and dimensional accuracy of tubular billet as pressed should be improved. Wedge pressing will be applied to compaction or preforming of billet of other shapes except bulk, ring and tube. Furthermore, wedge pressing should not be restricted to densification; it can be developed into a forming technology to expand its application range.
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