中文摘要：

为了研究热泵设置对换热网络系统节能和CO2减排的综合影响，建立了以换热网络年度化的改造费用和新增CO2排放量最小为目标的多策略分步改造的多目标优化模型。以酮苯脱蜡装置的换热网络改造为例，阐明了本文所提方法的有效性，并获得了经济性和CO2排放量目标权衡的Pareto曲线。本文还对热泵在换热网络中的设置位置进行了讨论，对比和分析了换热网络优化、热泵设置和燃料替换3种改造策略的经济性、减排效果以及节能效果。该方法可为过程工业系统的节能和CO2排放控制策略的制定提供理论依据。

英文摘要：

In order to investigate the comprehensive effects of heat pump installation on energy saving and CO2 emission reduction in heat exchanger network （HEN） retrofit, a step-by-step multi-objective optimization model with combination of multiple strategies was proposed for HEN retrofit, in which the objective was to minimize the annual HEN retrofit cost and newly increased CO2 emissions. A HEN retrofit problem of a benzol-ketone dewaxing unit was taken to illustrate the effectiveness of the proposed method. The Pareto fronts that represented the trade-offs between economy and CO2 emission were presented. The location of heat pump installation in HEN was discussed. For the three retrofit strategies, the effects of economy, CO2 emission and energy saving were compared and analyzed. The proposed method would provide theoretical fundamentals for formulating schemes of energy conservation and CO2 emission control in process industries.