热泵膜蒸馏系统及其特性分析

热泵可同时提供热能和冷能,与膜技术耦合具有较好的节能效果。在介绍热泵膜蒸馏系统结构和工作原理的基础上,对膜通量、热泵制冷系数、吨水能耗、单位热泵功率产水率、热泵功率与膜面积比等参数随料液温度的变化关系进行了分析。分析结果对掌握热泵膜蒸馏系统的基本特性具有较好的指导作用。     

热泵膜蒸馏系统结构及其优化分析

热泵膜蒸馏系统具有能耗低、可用于中高浓度料液等特点。针对不同料液温度、水蒸气凝结温度、热泵驱动能源等要求,给出了五类典型结构的热泵膜蒸馏系统,介绍了其结构和应用特点。在此基础上,建立吨水总费用与主要影响参数的关系方程,并进行了计算分析。结果表明,料液温度、膜组件成本与寿命、电价等对降低吨水总费用均具有重要影响。     

内压缩流程空分的换热与精馏研究

分析和讨论了内压缩空分设备的氧氮两组分、氧氮氩三组分及氧氩两组分和氮氩两组分的相平衡,精馏部分的上塔、下塔、粗氩塔、精氩塔的精馏以及高压主换热器、低压主换热器、过冷器及主冷凝蒸发器等换热设备。希望能促进空气分离设备在理论方面的发展。     

组合导向浮阀塔板多相流的数值模拟

为了深入了解组合导向浮阀塔板的流体力学性能,在阀片全开状态下,利用计算流体力学(CFD)方法对700 mm中试规模的组合导向浮阀塔塔板上的气液两相三维流场进行模拟研究,采用欧拉-欧拉非稳态模型(Eulerian),考虑气液两相间的动量传递现象,将清液层高度作为衡量非稳态流场收敛的判别标准。通过关联实验数据,得出适合组合导向浮阀塔板的清液层高度关系式,并与模拟结果进行对比。模拟结果表明,组合导向浮阀塔板的液面梯度和弓形区域回流面积小,具有良好的流体力学性能。     

利用太阳能和高温热泵的城市污泥热干化系统技术研究

太阳能是取之不尽的能源，高温双热源热泵也是节能型产品，节能率比普通热泵高70％。所以将太阳能与热泵组合作为热源对城市污泥进行热干化，热干化的污泥可以作为燃料进行焚烧，具有极大的应用潜力。介绍了利用太阳能和热泵作为热源，利用干燥机对城市污泥进行热干化的系统结构、工作原理和实验研究。该系统也可应用于干燥其它物料，如食品、药材等。     

用组合导向浮阀塔改造甲醇回收塔

对原有Φ14 0 0甲醇回收泡罩塔进行改造 ,利用计算机进行塔的模拟与优化 ,采用新型高效组合导向浮阀塔替代了原有塔型 ,取得了理想的效果     

Identification and Control of an Industrial Binary Distillation Column: A Case Study

The challenging problem of identification and control of an industrial binary distillation column is addressed in this paper. Process identification represents an alternative to modeling and is shown to be the appropriate procedure for predictive control design. The predictive controllers based on the identified model ensure stability and high performance for a wide operating range of the industrial distillation column.     

二甲苯塔重沸炉F402A/B余热回收改造

介绍PX装置二甲苯塔底重沸炉F402A/B余热回收系统由水热媒换热器改造为热管换热器,以及热管换热器特点和可能产生的问题分析及对策.     

全回热反应蒸馏塔的动态特性研究

摘要全回热反应蒸馏塔的反应操作和分离操作过程具有特殊的欠阻尼特性,而通过严格的再沸器液位控制可以使欠阻尼效果基本消除。以A和B反应生成C来说明了理想全回热反应蒸馏塔的这种动态特性。     

焦炉烟道气余热为热源的煤调湿技术应用

针对云煤能源公司下属焦化公司生产中因配煤水分高而造成的煤饼剥蚀量大、易坍塌、捣固成型困难等问题,进行了煤调湿工艺开发,以焦炉烟道气余热为热源或动力源,开发的"焦炉烟道废气-流化床"和"焦炉烟道废气-滚筒干燥机"煤调湿技术,可以控制配煤水分在10%左右,并且在节能、降耗、减排方面效益显著。     

严寒地区土壤源热泵系统地埋管特性影响研究

对土壤源热泵应用地埋管材料及热物性进行研究,以长春市某公共建筑为研究对象,采用控制面积分区热补偿法对地源热泵的供热供冷面积进行设计。针对严寒地区的气候条件,利用TRNSYS软件搭建地源热泵系统模型,模拟系统长期运行的土壤温度变化,结果表明合理选用地埋管材料与循环介质情况下土壤源热泵系统在严寒地区的运行状态可以达到基本稳定。     

通过连续精馏热量平衡 剖析进料热状态的合理选择

液体精馏是化工原理课程重要的单元操作之一。精馏的进料热状态影响到精馏工程中的多个方面。进料热状态的合理选择涉及了能量的合理利用问题。从连续精馏热量平衡的角度剖析进料热状态的合理选择,不仅能使学生深刻理解精馏理论原理,而且能够引导学生树立起技术经济的概念和争取工程最优化的工程观点。     

Experimental Study on the Heat Transfer Enhancement of Oscillating-Flow Heat Pipe by Acoustic Cavitation

Experimental investigations on the heat transfer characteristics of an oscillating-flow heat pipe with acoustic cavitation in comparison with the ordinary oscillating-flow heat pipe are given in this article. The experimental results showed that the heat transfer rate of an oscillating-flow heat pipe with an acoustic cavitation field imposed on the evaporator section was higher than that without a cavitation field by 8–24.5%. It has been proved that acoustic cavitation can enhance the heat transfer performance of an oscillating-flow heat pipe. However, for the case of acoustic cavitation applied on the condenser section, not all ultrasonic fields applied were effective, and the heat transfer rate increased from ?39 to 77%. Further discussion on the experimental results is provided.     

低供热源变压再生脱碳新工艺的应用

通过采用低供热源、变压再生脱碳工艺 ,对原脱碳再生系统进行了改造 ;对改造前、后主要工艺参数及消耗进行了比较 ;阐述了该工艺的特点及操作注意事项。     

关于地源热泵费用简介

简要介绍了地源热泵的原理及其特点，与中央空调初投资及运行费用的比较。     

开封空分膨胀机-精馏塔系统与法液空装置的对接技术

从工艺流程特点、工艺对接条件、装置安全技术、开封膨胀机和精馏塔系统与法液空装置性能对照、空分装置的考核结果与评价几个方面对国产开封膨胀机和精馏塔系统与法液空装置对接的技术攻关内容进行论述,并通过对实际运行的技术数据分析,说明对接技术成熟、安全可靠,具有节约资金、工期短、见效快的优点,经济效益显著     

带有冷存料塔釜的热敏物料间歇精馏

提出了带有冷存料塔釜的热敏物料间歇精馏流程，该流程包括冷存料塔釜、预热-冷却器、循环泵、蒸发器和精馏塔及冷凝器。该过程的设备降解指数比常规间歇精馏过程小得多。通过模拟计算，研究了回流比、预热-冷却器面积、塔釜冷却量、蒸发器加热量以及泵循环流量对热敏精馏过程的影响。     

Investigation of Temperature Distribution and Heat Transfer in Fluidized Bed Using a Combined CFD-DEM Model

Fluidized beds are widely used in many industries because they are effective for both mixing and drying. The distinct element method (DEM) has recently received more attention for investigating the phenomena of multiphase flow because the technique is effective in gathering detailed information on complex phenomena without physically disturbing the flows. However, most studies have focused on the aerodynamics of the particles. In this study, a combined computational fluid dynamics (CFD)-DEM model, which allows prediction of gas and particle temperature profiles and heat transfer coefficients in a two-dimensional fluidized bed, was developed. The predicted results were compared with the experimental results at the superficial gas velocities of 2.04, 2.22, and 2.41 m/s and at the controlled inlet temperature of 343 K. Based on the comparison between the predicted and experimental results, it was found that the developed model performed adequately in predicting the gas temperature profiles, and the predicted particle temperature profiles were higher than the experimental data. The predicted heat transfer coefficient was slightly higher than the experimental data. However, the predicted and experimental results had a similar trend in which the heat transfer coefficient increased as a function of an increase in superficial gas velocity. In addition, the minimum fluidization velocity predicted by the developed model agreed well with the experimental data. Such predictions can provide essential information on temperature and heat transfer coefficients inside the fluidized bed for design and scale-up.