Dynamic model of saturator based on a global heat and mass transfer coefficient

Saturator is one of the core components of humid air turbine （HAT） and is the main feature of HAT making it different from other gas turbine cycles. Due to the lack of sufficient experience in commercial plant operation, HAT cycle has a great demand for modeling and simulation of the system and its components, especially the saturator, to provide reference for system design and optimization. The conventional saturator models are usually based on the theory of heat and mass transfer, which need two accurate coefficients to ensure convincing results. This work proposes a global heat and mass transfer coefficient based on cooling tower technology to model the saturator in small-scale HAT cycle. Compared with the experimental data, the simulation results show that the proposed model well predicts the dynamic humidity and temperature distribution characteristics of saturator at low air pressure and temperature.

本溪衍水斜拉桥主桥塔梁同步平衡法施工技术

以本溪衍水特大桥主桥钢拱塔与钢箱梁同步施工为例,突破常规斜拉桥塔、梁分离异步式施工方法,应用midas civil有限元软件建模分析及三维模拟技术,施工中合理组织安排塔、梁、索施工顺序,并通过仿真计算与现场实测相结合的方法,实时监测结构应力与线型,采用塔梁同步平衡法施工,提高施工作业效率,降低了施工安全风险,确保了工程质量及工期目标的实现。