环状空间热网供回水压线不对称性研究

Research on Asymmetry of Supply and Return Water Pressure Lines of Annular Space Heat-supply Network

基于面向对象水力计算方法建立空间热网水力模型。结合算例,在循环泵特性、用户流量保持不变条件下,对回水主管绝对粗糙度、管段堵塞、管段泄漏对供回水压线对称性的影响进行计算分析。回水主管绝对粗糙度的影响:当供回水主管绝对粗糙度不同时,供回水压线出现不对称。回水主管绝对粗糙度越小,不对称情况越明显。管段堵塞的影响:与回水主管堵塞相比,供水主管堵塞是导致供回水压线不对称的主要原因。管段泄漏的影响:供回水主管泄漏均导致供回水压线不对称。与回水主管泄漏相比,供水主管泄漏是导致供回水压线不对称的主要原因。泄漏量越大,由供水主管泄漏引起的供回水压线的不对称越明显。

Based on the object-oriented hydraulic calculation method,the hydraulic model of the space heat-supply network is established.Combined with the calculation example,under the condition that the characteristics of the circulation pump and the user flow rate remain unchanged,the effects of the absolute roughness of the return water main,the pipe section blockage and the pipe section leakage on the symmetry of the supply and return water pressure lines are calculated and analyzed.The effect of the absolute roughness of the return water main:when the absolute roughness of the supply and return water mains is different,the supply and return water pressure lines are asymmetric.The smaller the absolute roughness of the return water main,the more obvious the asymmetry.The effect of pipe section blockage:the blockage of the supply and return water mains leads to the asymmetry of the supply and return water pressure lines.Compared with the blockage of return water main,the blockage of supply water main is the main cause of the asymmetry of the supply and return water pressure lines.The effect of pipe section leakage:compared with the leakage of return water main,the leakage of water supply main is the main cause of the asymmetry of the supply and return water pressure lines.The larger the leakage,the more obvious the asymmetry of the supply and return water pressure lines caused by the leakage of the supply water main.