【作者】 王敬凯；

【导师】 尹洪超；

【作者基本信息】 大连理工大学 ， 热能工程， 2012， 硕士

【摘要】 能源危机和水资源短缺已经引起世界各国的普遍关注,大力推进节能减排已成为各国政府的共识。节能减排就是要节约能源、降低能耗、减少污染物排放,过程工业既是耗能大户也是污染物排放大户,因此,设计合理的用水网络和换热网络对过程工业节能减排至关重要。目前,过程工业换热网络和水网络的优化设计都已比较成熟,但是在水网络中考虑换热的优化设计还较少,对其换热网络综合优化时考虑压降因素的优化设计更少,而忽略压降影响会导致设计与工程实际差别很大,甚至不能实施。本文采用改进粒子群优化算法这一有力工具,对考虑压降的能量集成水网络优化设计问题进行研究。首先对国内外考虑压降的换热网络综合问题进行研究,将换热网络综合优化问题归结为普适性的混合整数非线性规划问题。针对目前求解混合整数非线性规划模型存在的问题和局限性,提出改进的粒子群优化算法,采用MATLAB编程,测试函数验证算法的可行性和有效性,为后续考虑压降的换热网络模型优化和考虑压降的能量集成水网络模型优化提供有效的求解工具。其次针对考虑压降的换热网络综合问题,在换热网络分级超结构基础上,以年度化费用最小为目标函数,建立有分流的混合整数非线性规划模型,该模型能囊括无分流情况,加强获取最优解能力,通过改进粒子群算法对模型求解,对换热网络换热面积、换热单元数、公用工程耗量和压降消耗进行同步优化,使换热网络的优化设计更符合工程实际情况,并通过实例验证方法的可行性和有效性。最后在求解考虑压降的换热网络综合问题方法和思路的基础上,本文尝试对考虑压降的能量集成水网络进行优化设计,利用分步优化方法对该用水用能网络进行同时优化,使获得的能量集成水网络设计更接近工程实际,本文的研究可以为过程工业节能降耗与节水减排提供设计依据和理论指导。更多还原

【Abstract】 Energy crisis and shortage of water resources have caused widespread concern all over the world. And vigorously promote energy saving and emission reduction has become a consensus of governments in the world. Energy saving and emission reduction is to save energy and reduce energy consumption and reduce emissions. Process industry is not only energy-intense but also is the main pollutant emission. So it is very important to design the reasonable water network and heat exchanger network for process industry. The optimal design study of water network and heat exchanger network are relatively mature now, but the study of water network optimal design considering heat exchanger is less. What is more, considering pressure drop effects are more less when heat exchanging. Ignore the pressure drop impact will lead to great difference between the design and engineering practical situation, even can not implementation.This paper studies optimal design of integrated water networks considering pressure drop effects, by using particle swarm optimization, which is an effective tool.First, this paper researches on the theory and method of the heat exchanger comprehensive and optimization problem about home and abroad. According to the existing limitations of solving algorithm, an improved particle swarm optimization is presented, which was verified through the test function. And for the following model of heat exchange network and heat integrated water networks, which both considering pressure drop effects, the new algorithm is an effective tool.Second, for the synthesis and optimization of heat exchanger network considering pressure drop effects, based on stage-wise superstructure, an mixed integer nonlinear programming model with least annual cost as objective function is established. Which optimizing heat transfer area, unit number, utility consumption and pressure drop consumption simultaneously. The model is split heat exchanger network while containing the case of the stream no splitting. The proposed model will be solved by particle swarm optimization and can do better in global optimal solution. Optimizing heat transfer area, unit number, utility consumption and pressure drop consumption simultaneously. All that in order to make the optimization design of heat exchanger network more accord with engineering practice. And at last through four examples to verify the feasibility of the method. Last, basing on the idea and method of the proposed model of heat exchanger network synthesis and optimize, this paper attempts to optimize and design the heat integrated water network, which considering the pressure drop. The stepwise method is used to optimize the water utilization and heat exchanger networks simultaneously. While expecting the specific design of the heat integrated water network more close to the actual project, and also can provide some theoretical guidance for energy-saving and emission reduction in process industry.更多还原