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通常情况下换热网络系统是按照特定的参数设计的,但实际工程实施中往往有很多因素影响运行工况偏离设定值,造成原网络结构无法满足出口温度或者使得运行费用大大增加,因此运用旁路控制是改善网络操作弹性、调节物流出口温度和节能降耗的有效方法,而如何确定旁路位置是人们关注较多的一个问题。提出以运行费用为优化目标,以所有潜在旁路开度为调节变量进行优化计算,从而确定旁路位置及数目的设计方法。实际算例说明,通过增设旁路优化不仅提高了换热网络自由度和可控性,其运行费用也平均降低了2.2%,说明所提出方法对改善网络操作弹性和节能降耗的有效性。
Under normal circumstances, the heat exchange network system is designed according to specific parameters, but there are many factors that affect the operating conditions deviate from the set value in the actual project implementation, resulting in the original network structure can not meet the outlet temperature or make the operating costs greatly increased, so the use of Bypass control is an effective way to improve the flexibility of network operation, regulate outlet temperature of the logistics and save energy and reduce consumption. How to determine the bypass position is a problem that people pay more attention to. It is proposed that the operating cost should be optimized, and all potential bypass openings should be optimized as the manipulated variables so as to determine the design of bypass locations and numbers. The actual example shows that the additional bypass optimization not only improves the degree of freedom and controllability of the heat exchange network, but also reduces the operating costs by an average of 2.2%. This shows the effectiveness of the proposed method in improving network operation flexibility and saving energy and reducing consumption.