Abstract: Energy integration can not only improve energy efficiency，but also reduce water consumption and CO2 emissions. In this paper，the most practical process integration method - pinch technology-was used to optimize the existing heat exchanger network of an acetone-benzol dewaxing device. The unreasonable heat exchange and minimum utility consumption were identified. It was calculated that the energy-saving potential was about 4228.3 kW. The final retrofit scheme was based on the re-matching of several streams. The retrofit scheme for the heat exchanger network can save 1456.4 kW of heating utility and 524.2 kW of cold utility. The economic analysis of the optimized network showed that the energy cost can be reduced by 2.785 million RMB/yr，waste water productions can be reduced by 3000 tons/yr and the amount of CO2 emission can be reduced by 9078.2 tons/yr. According to the above analysis，optimizing the heat exchanger network can lead to remarkable water saving and CO2 emissions reduction. This study demonstrated that systematic analysis and optimization of an existing acetone-benzol dewaxing device could provide a practical way to improve energy utilization efficiency and reduce resource consumption.

Key words: pinch technology, energy saving, water saving, CO2 emission

摘要： 对企业的能量系统进行集成优化，可以提高能源的利用效率，并同时减少装置的用水量和CO2的排放量。本文针对某酮苯脱蜡装置，对其现行的换热网络进行了夹点分析，提取了物流数据，找出了用能不合理之处和装置的能量目标，通过计算获得该装置的节能潜力为4228.3 kW。考虑该装置实际的状况，提出对部分物流进行重新匹配的热集成优化方案，结果表明可分别节约1456.4 kW的加热公用工程和524.2 kW的冷却公用工程。对优化后方案进行的经济性分析显示，该方案每年可节约278.5万元的能量费用、减少0.3万吨污水和9078.2吨CO2的排放。对酮苯脱蜡装置进行一体化的优化可以降低能耗和成本，本文提出的优化方案对相关装置的节能减排也具有一定的指导作用。

关键词: 夹点技术, 节能, 节水, CO2减排