Advanced Entrained-Flow Gasifier Modeling Based on an In-Situ Particle Conversion Study

塑料等含碳废物的气化是减少化学工业使用含碳原料所产生的碳足迹的关键技术，也是封闭碳循环的基本方面。此外，它还有助于克服世界上许多国家面临的废物问题。对于废物等替代气化原料，有必要使气化技术适应目前的框架。从实验室规模到中试规模再到示范规模的技术开发/调整的经典、冗长和成本密集型方法的一个有前途的替代方法是数值模拟。从文献中看，只有少数经过验证的CFD模型能够可靠地反映高压/高温反应堆中的局部现象。为了开发这些可靠的模型，在东中国科技大学运行的小型OMB气化炉中进行的现场颗粒测量将与TU Bergakademie Freiberg的非均相燃料转化的颗粒分辨数值研究相结合。光学进入OMB反应器可以在现场研究局部效应，如颗粒运动、颗粒转化和颗粒破碎。在过程中进行的测量是开发先进的粒子转化模型的基础。构成煤/焦转化现象的详细的粒子分辨数值模拟支持这一发展。在新的、先进的子模型的基础上，将使用CFD对实验室规模的OMB气化炉内的焦炭转化进行研究，并将根据气化炉中的测量结果仔细验证结果。作为下一步，将考虑转换替代原料，例如选定的二次原料。为此，将进行实验研究，详细研究粒子转化行为，并调整转化子模型。最终计算旨在确认整个气化炉CFD模型的可靠性和灵活性。总体目标是开发和批准先进的、经过验证的CFD模型，这些模型可靠地预测不同类型固体燃料的工业气流过程中的局部转化现象，作为开发新技术和使用替代燃料的基础。

The gasification of carbon-containing waste such as plastics is a key technology in the reduction of the carbon footprint resulting from the chemical industry's use of carbonaceous feedstock, and the essential aspect of a closed carbon cycle. In addition, it can help to overcome the waste problems faced by many countries worldwide. For alternative gasification feedstocks such as waste it is necessary to adapt the gasification technology to the current framework. One promising alternative to the classical, lengthy and cost-intensive method of technology development/adjustment from lab-scale to pilot-scale to demo-scale is numerical modeling.From the literature, only a few validated CFD models are capable of reliably reflecting local phenomena in a high-pressure/high-temperature reactor. To develop these reliable models, in-situ particle measurements in the bench-scale OMB gasifier operated at the East China University of Science and Technology will be combined with particle-resolved numerical studies on heterogeneous fuel conversion at TU Bergakademie Freiberg. Optical access to the OMB reactor allows local effects to be studied in situ, such as particle movement, particle transformation, and particle fragmentation. Measurements taken inside the process are the basis for developing advanced particle conversion models. Detailed, particle-resolved numerical simulations that comprise the coal/char conversion phenomena support this development. Based on the new, advanced submodels, the char conversion inside the bench-scale OMB gasifier will then be studied using CFD, and the results will be carefully validated against the measurements taken in the gasifier. As a next step, the conversion of alternative feedstocks, e.g. selected secondary raw materials, will be considered. For this purpose, experimental investigations will be carried out, the particle conversion behavior will be studied in detail, and the conversion submodels will be adjusted. Final calculations are designed to confirm the reliability and flexibility of the entire gasifier CFD model. The overall goal is to develop and approve advanced, validated CFD models that reliably predict the local conversion phenomena in industrial entrained-flow processes for different kinds of solid fuel as a basis for developing new technologies and utilizing alternative fuels.