论文部分内容阅读
本文根据运筹学最短路和最小树原理,提出了热网平面布置优化的理论方法。该方法可保证优选方案累计管长最短、供热主干线最短、总费用最低。该方法一般情况下可实现一次性成功,无需多方案比较。该方法使用简单,仅需依照一定的规则进行标图即可选出最优方案,无需复杂的计算。一般工程设计人员都能掌握使用。 供热网路的平面布置不仅决定着自身的初投资,同时还影响着系统的运行费用。一般地说,在同一区域管网越长,初投资越大,主干线越长,运行费用越高。如果热网布置同时满足累计长度和主干线最短,则为最优方案,其总费用(初投资和运行费用)必为最小。这是因为上述定义的最优方案还可将较粗管段限制在最低水平。 工程设计中,往往根据经验和方案比较确定平面布置。这样很难取得最优的平面布置方案。现有的计算机程序往往需经大量的计算和复杂的输入,也很难被工程设计人员接受。本文综合利用了运筹学中最短路和最小树原理,提出了热网最优平面布置的理论方法。该方法以累计长度和主干线最短为目标,克服了经验性和单纯采用最小树原理造成失误的可能性,避免了进行复杂的具体方案技术经济计算,在理论上具有先进性,从 应用角度分析,该方法简单明了,极易掌握,工程设计人员仅需进行简单的作图,即可快速求得最佳平面布
In this paper, based on the shortest path and minimum tree principle of operational research, a theoretical method for optimization of thermal network layout is proposed. This method can ensure that the optimal solution has the shortest cumulative tube length, the shortest heating main line, and the lowest total cost. This method can achieve one-time success in general, without the need for multiple program comparisons. The method is simple to use and only requires a certain rule to be plotted, that is, an optimal solution can be selected without complicated calculation. General engineering designers can use it. The layout of the heating network not only determines its initial investment, but also affects the operating costs of the system. In general, the longer the pipeline network in the same area, the greater the initial investment, the longer the main line, and the higher the operating cost. If the heating network layout satisfies both the cumulative length and the shortest trunk line, it is the optimal solution, and its total cost (initial investment and operating costs) must be minimal. This is because the above-defined optimal solution can also limit the thicker pipe segments to the lowest level. In engineering design, layout is often determined based on experience and plans. This makes it difficult to achieve an optimal floor plan. Existing computer programs often require a lot of calculations and complicated inputs, and are difficult for engineering designers to accept. In this paper, the shortest path and minimum tree principle in operational research is comprehensively used, and the theoretical method for the optimal plane layout of thermal network is proposed. The method takes the cumulative length and the shortest trunk line as the goal, overcomes the possibility of mistakes caused by the empirical and simple use of the minimum tree principle, avoids the technical and economical calculations of complex concrete schemes, and is theoretically advanced, from the perspective of application. The method is simple and straightforward, easy to grasp, and the engineering designer can quickly obtain the best flat cloth simply by drawing simple drawings.