Using Process Energy Integration Technology in the Energy-Saving Retrofit of Large-Scale Complex Chemical Process System

1 INTRODUCTIONIn recent years,the energy-saving retrofit of existing chemical process plants,especially exist-ing large-scale complex chemical process system(LCCPS),has been becoming necessary as theengineers'knowledge goes on and the market changes.     

换热器网络的最优设计及其应用

以炼油厂催化裂化装置油料换热系统为对象,应用夹点技术及TI法,形成具有最大能量回收特征的初始网络,并根据能量松驰原理及分枝调整技术,对初始网络进行最优调整,应用实例表明,换热器网络的最优设计具有实用性和经济价值．     

双管程热交换器强化传热研究

研发一种双管程热交换器(液/液),以强化传热技术为基础,从换热温度、流体流速、蒸发量和最小换热温差4个方面进行协同优化设计。通过相变优化、驻点优化技术,该换热器换热能力可提高30%,同时增强了抗堵塞和耐腐蚀能力。     

克拉玛依石化Ⅰ套蒸馏装置换热网络优化

介绍了中国石油克拉玛依石化公司Ⅰ套蒸馏装置换热网络优化方案及实施情况。通过利用国外先进的模拟优化软件和技术,并采用夹点技术对换热网络进行了优化分析,从而形成了投资效益比较高的优化方案。通过优化方案的实施,装置未新增任何设备,只调整了运行工艺参数,使装置0.6 MPa蒸汽增产2 t/h,降低电负荷17.5 k W,降低热负荷895.5 k W,每年节能效益44.20万元,约占改造前成本的1.03%,节能效果显著。     

对滚切式双边剪夹送辊装置的分析及调整方法的改进

夹送辊作为钢板滚切式双边剪的重要组成部分，直接影响钢板的剪切质量，由于调整方法不当，调整精度达不到要求等原因，致使剪切出的钢板经常出现缺陷，针对双边剪夹送辊装置的主要结构特点进行分析、明确其工作机理，通过改进其调整方法，使其达到更好的剪切质量。     

取向硅钢热轧卷形不良原因分析与改进

取向硅钢卷形质量直接关系到成材率,针对某钢厂生产取向硅钢热轧基料卷取尾部滑移,分析了产生的主要原因,通过对夹送辊辊缝标定、侧导板位置测量、辊道滞后率调整、精轧轧制中心线调整等措施,取向硅钢的尾部卷形大有提升。     

Power grand composite curves shaping for adaptive energy management of hybrid microgrids

This work proposes a systematic approach for the adaptive identification and implementation of efficient power management strategies (PMS) in the course of operation of hybrid renewable energy microgrids. The approach is based on the temporal evolution of the system power grand composite curve (PGCC), which is adaptively shaped on-line and within short-term time intervals to form a sequence of decisions indicating the instant and duration of activation of different subsystems. It builds on from previous work where the potential for system performance enhancement could not be exploited through pre-specified PMS identified off-line. More specifically, it involves a stored energy targeting step that exploits the PGCC to identify the desired operational profile of an accumulator during a prediction horizon in order to satisfy the system operating goals. The identified energy targets are subsequently enforced through a sequence of control actions that enable the exact matching of the PGCC hence resulting in a new PMS. The method is elaborated graphically for multiple potential operating goals and is supported by a formal mathematical model that captures system structural and temporal characteristics. It is implemented on an actual hybrid microgrid considering multiple RES-based energy generation and storage options for expected and unexpected weather conditions.     

Investigation on the pinch point position in heat exchangers

The pinch point is important for analyzing heat transfer in thermodynamic cycles.With the aim to reveal the importance of determining the accurate pinch point,the research on the pinch point position is carried out by theoretical method.The results show that the pinch point position depends on the parameters of the heat transfer fluids and the major fluid properties.In most cases,the pinch point locates at the bubble point for the evaporator and the dew point for the condenser.However,the pinch point shifts to the supercooled liquid state in the near critical conditions for the evaporator.Similarly,it shifts to the superheated vapor state with the condensing temperature approaching the critical temperature for the condenser.It even can shift to the working fluid entrance of the evaporator or the supercritical heater when the heat source fluid temperature is very high compared with the absorbing heat temperature.A wrong position for the pinch point may generate serious mistake.In brief,the pinch point should be founded by the iterative method in all conditions rather than taking for granted.     

热泵精馏气体分馏装置的用能分析

利用PRO/II软件分析了某0.6 Mt/a气体分馏热泵流程用能情况,优化了气分装置热泵系统的工艺参数,计算了各设备的有效能效率。利用夹点技术对其换热网络进行了优化,在不增加设备投资费用的基础上节省加热公用工程量712.29kW,冷却公用工程量712.29kW,具有较好的节能效果。     

提纯回用氢网络的夹点变化规律

在氢系统中引入提纯装置可以经济有效地提高氢气的回用率,是氢系统中广泛采用的方法。但引入提纯回用过程可能会影响氢系统的夹点位置,还可能使氢系统出现多夹点。由于夹点对系统性能的分析与优化具有极其重要的作用,而夹点位置的变化则会影响到用氢过程的匹配。在氢夹点技术的基础上,通过图示分析法,研究了在不同提纯产品浓度下提纯回用过程的夹点变化规律和趋势,对于考虑提纯回用的氢网络集成具有重要的意义。