350MW超临界四角切圆锅炉冷态空气动力场试验及仿真研究

Experimental and Simulation Study of the Cold-state Aerodynamic Field in a 350 MW Supercritical Tangentially-fired Boiler

本文结合华润电力盘锦热电厂350 MW机组新建工程的调整试验工作,针对该锅炉的炉内空气动力学特性进行了仿真研究。利用计算流体力学Fluent软件,以试验工况参数作为边界条件,对炉膛内部进行了全范围三维仿真模拟。计算得到了炉内速度场,并将此模拟计算结果与其中某一炉膛截面实测的速度场进行了对比验证。计算结果基本符合实际测量值,验证了仿真模型和模拟计算方法的合理性。同时,计算结果表明炉内一次风、二次风和SOFA风截面速度分布合理,气流相交位置良好。此外,可模拟得到实际较难测量的炉内湍流强度分布,计算结果显示其分布合理,有利于炉内的燃烧稳定和提高燃烧效率。该研究成果应用于该机组调试工作中,在一定程度上简化了试验过程,减少了工作量,也得到了更丰富、更直观的试验结果。

In combination with the commissioning test of a 350 MW unit newly built in Huarun Electric Power Corporation Panjin thermal power plant,a simulation study was performed of the in-furnace aerodynamic characteristics of its boiler. By making use of the CFD software Fluent,with the parameters under the actual test conditions serving as the boundary conditions,a full spectrum of three-dimensional simulation of the internals inside the furnace was performed. The in-furnace speed field was obtained through calculation and the simulation and calculation results were contrasted and verified with the speed field actually measured in a section of the furnace. It has been found that the calculation results are basically in agreement with the values actually measured,therefore,the rationality of the simulation model and the simulation calculation method are verified. In the meantime,the calculation results show that the distribution of the primary air,secondary air and SOFA air in various sections is rational and the air flow intersection locations are good. In addition,the distribution of the turbulent flow intensity in the furnace relatively difficult to be actually measured can be obtained through the simulation calculation and the calculation results indicates that the distribution is rational,thus instrumental to the stable combustion inside the furnace and enhancing the combustion efficiency. The research results have been applied in the commissioning work of the foregoing unit and the test run processes were simplified to a certain extent,thus making the work load lessened and an even richer and intuitive test results obtained.