Adamczyk Wojciech P
Institute of Thermal Technology, Konarskiego 22C, 44-100 Gliwice, Poland.
Arch Comput Methods Eng. 2017;24(4):669-702. doi: 10.1007/s11831-016-9186-z. Epub 2016 Aug 31.
The numerical simulation of the large scale industrial circulating fluidized bed (CFB) boilers, working under air- and oxy-fuel combustion are presented in this paper. Moreover, two-dimensional experimental rig used for numerical model validation is described. For three-dimensional numerical simulations two industrial compact CFB boilers were selected installed in Polish Power Plants. Numerical simulations were carried out using three-dimensional model where the dense particulate transport phenomenon was simultaneously modelled with combustion process. The fluidization process was modelled using the hybrid Euler-Lagrange approach. Within the paper, readers can find information about used computational technique and a number of reference to specific work. The impact of radiative heat transfer on predicted temperature profile within the CFB boiler was investigated in presented work. Moreover, the novel model for retrieving radiative properties of gases under oxy-fuel combustion process was used. The evaluated temperature and pressure profiles during numerical simulations were compared against measured data collected during boiler air-fuel operation. Collected data was also used for validating numerical model of the oxy-fuel combustion model. Stability of the model and its sensitivity on changes of composition of the oxidizer were studied. This simulations were evaluated to check the response of the numerical model on changing the combustion conditions from air- to oxy-fuel combustion process. The comparison of the pressure and temperature profiles for all considered cases gave comparable trends in contrary to measured data.
本文介绍了在空气燃烧和富氧燃烧条件下运行的大型工业循环流化床（CFB）锅炉的数值模拟。此外，还描述了用于数值模型验证的二维试验台。对于三维数值模拟，选择了波兰发电厂安装的两台工业紧凑型CFB锅炉。数值模拟采用三维模型，其中同时对密集颗粒传输现象和燃烧过程进行建模。流化过程采用混合欧拉-拉格朗日方法进行建模。在本文中，读者可以找到有关所使用的计算技术的信息以及许多对具体工作的参考文献。在当前工作中，研究了辐射传热对CFB锅炉内预测温度分布的影响。此外，还使用了用于获取富氧燃烧过程中气体辐射特性的新模型。将数值模拟过程中评估的温度和压力分布与锅炉空气燃料运行期间收集的测量数据进行了比较。收集的数据还用于验证富氧燃烧模型的数值模型。研究了模型的稳定性及其对氧化剂成分变化的敏感性。对这些模拟进行评估，以检查数值模型对从空气燃烧到富氧燃烧过程中燃烧条件变化的响应。与测量数据相反，所有考虑情况下的压力和温度分布比较给出了可比的趋势。
