综合管廊内蒸汽管道设计要点

Key Points of Steam Pipeline Design in Utility Tunnel

对综合管廊内蒸汽管道设计的要点(疏水装置、补偿方式及绝热设计)进行分析。疏水管与蒸汽管道连接处设聚集凝结水的短管,疏水管连接在短管侧面。疏水阀组布置在蒸汽管道下方便于操作处,疏水阀组出口疏水管向上从管廊侧壁引出后直埋敷设至附近疏水井。对于工作管规格小于DN250mm的直管段,可采用外压轴向型波纹管补偿器。对于工作管规格大于或等于DN250mm的直管段,可采用轴向压力平衡式波纹管补偿器。对于倒虹段,可采用自然补偿或大拉杆型波纹管补偿器。将与工作管最近的传统保温材料替换成纳米气凝胶毡,可缩小蒸汽管道的外直径。蒸汽管道隔热支架的设计以减小金属连接面积为出发点,有效控制散热量。

The key points of the steam pipeline design in utility tunnel (steam trap device,compensation mode and adiabatic design) are analyzed. A short pipe for collecting condensed water is set at connection between steam trap pipe and steam pipeline,and the steam trap pipe is connected to the side of the short pipe. The steam trap valve group is arranged under the steam pipeline for easy operation,and the outlet steam trap pipe of steam trap valve group is led upward from the side wall of the utility tunnel and directly buried to the nearby steam trap well. For straight pipe sections with working pipe specification of less than DN 250 mm,an external pressure axial type bellow expansion joint can be used. For straight pipe sections with working pipe specification greater than or equal to DN 250 mm,an axial pressure balanced bellow expansion joint can be used. For the inverted siphon,a natural compensation or a large tie rod type bellow expansion joint can be used. The traditional insulation material closest to the working pipe is replaced with nano aerogel felt to reduce the outer diameter of the steam pipeline. The design of the steam pipeline insulation support is based on the reduction of the metal connection area to effectively control heat loss.