In a Chemical Looping Combustion system, the fuel and air reactors are strongly coupled because of chemical reactions in both and the circulation of solid oxygen carrier between them. To capture the effects inside the system, a novel dynamic flowsheet simulation environment for solids processes is applied to Chemical Looping Combustion of methane. Flowsheet simulation is a tool for process analysis and optimization covering multiple process units and flows in a system.

An experimental 25 kW_th pilot plant is operated, and all of its process units are modeled. The modeling comprises three fluidized bed reactors, two operating in bubbling fluidized bed condition and one as a circulating fluidized bed riser. A cyclone is used for gas-solid separation after the air reactor. The loop seals ensure gas sealing between the reactors. Fluid mechanics inside the systems are modeled with empirical and semi-empirical correlations, to enable fast calculations. This approach becomes handy when long-term dynamic effects like abrasion, start-up, or shut-down procedures as well as load changes are to be modeled.

Chemical reactions for a gaseous fuel and their implications on gas flows were implemented. In addition, oxidation and reduction of the solid oxygen carrier in the three reactors were part of the simulation. To validate the simulation results, the pilot plant was operated with methane as fuel. Gas measurements were taken after both stages of the fuel reactor. Additionally, solid samples were drawn from the hot facility to examine the oxidation state of the carrier, when fuel is introduced.

A transient simulation of plant operation over a total runtime of 40 min reveals that the solids inventories of the fluidized bed reactors in the system need only 30 s in the present case to reach a new steady state after a load change. If the oxidation and reduction reactions of the oxygen carrier are taken into account, however, this response time extends dramatically to several hundreds of seconds, which can also be seen in the experimental campaigns. The simulation of such a system behavior requires a powerful simulation tool for flowsheeting, which has been found here in the dynamic simulation framework.

在化学循环燃烧系统中，由于燃料和空气反应堆之间的化学反应以及固体氧载体之间的循环，因此燃料和空气反应堆之间的连接非常牢固。为了捕获系统内部的影响，将用于固体过程的新型动态流程图模拟环境应用于甲烷的化学循环燃烧。流程模拟是用于过程分析和优化的工具，涵盖系统中的多个过程单元和流程。

实验25千瓦_个试装置操作，并且所有它的进程单元被建模。该模型包括三个流化床反应器，两个在鼓泡流化床条件下运行，一个作为循环流化床立管。旋风分离器用于空气反应器后的气固分离。环形密封确保反应堆之间的气体密封。系统内部的流体力学通过经验和半经验相关性进行建模，以实现快速计算。当要模拟长期动态影响（例如磨损，启动或关闭程序以及负载变化）时，此方法变得很方便。

实施了气体燃料的化学反应及其对气流的影响。另外，在三个反应器中固体氧载体的氧化和还原是模拟的一部分。为了验证模拟结果，中试装置以甲烷为燃料运行。在燃料反应器的两个阶段之后进行气体测量。另外，当引入燃料时，从热设备中提取固体样品以检查载体的氧化态。

在总运行时间40分钟内对工厂运行进行的瞬态模拟表明，在当前情况下，系统中流化床反应器的固体存量仅需30 s即可在负载变化后达到新的稳态。但是，如果考虑到氧气载体的氧化和还原反应，则该响应时间将大大延长至数百秒，这在实验活动中也可以看到。对这种系统行为的仿真需要强大的流程图仿真工具，该工具已在动态仿真框架中找到。