Dynamic simulation of reactive fluidized bed systems on the example of the Chemical-Looping-Combustion (CLC) process for solid fuels

以固体燃料化学链燃烧 (CLC) 过程为例的反应流化床系统的动态模拟

• 批准号: 238541479
• 负责人: Professor Dr.-Ing. Stefan Heinrich, since 1/2020
• 金额: --
• 依托单位: Institut für Feststoffverfahrenstechnik und Partikeltechnologie V-3
• 依托单位国家: 德国
• 项目类别: Priority Programmes
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2020-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/238541479?language=en
• 关键词: Dynamic; simulation; reactive; fluidized; bed

Objective of the project is the development of models for the simulation of systems of interconnected fluidized bed reactors. The models should describe the transient system behavior with reasonable accuracy while having a low demand on computing resources. This should allow for an iterative calculation of interconnected systems with recycle streams. The aim of the simulation is to describe the dynamic behavior of the entire system, and to optimize the whole system and especially procedures for load-change, startup and shutdown, respectively. Separate models for reactors with bubbling and circulating fluidized beds will be formulated. As reactions gas/solid and homogeneous gas reactions are taken into account, both with and without change in the gas volume. The chemical looping combustion process for solid fuels shall be used as an example process The models shall finally be validated by measurements in the CLC system of TUHH. One focus of the current project shall be the formulation, implementation and validation of a new semi-empirical model for the circulating fluidized bed. Especially the description of the dynamic behavior of a fluidized bed shall be improved compared to the current assumption of an instantaneous adoption of the fluid mechanics to changes of operating parameters. CFD-calculations with the MP-PIC method shall be used for determining model parameters for geometries and sizes which deviate from those the empirically determined parameters are based on. To facilitate this process for the parameter determination, an interface shall be implemented for the data exchange between the CFD simulator with the module to be developed.In addition an enthalpy balance shall be added to the reactor model. It will take into account the reaction enthalpies as well as heat losses and heat exchange. This balancing of the enthalpy will enable the simulation system to determine also the thermal behavior of interconnected fluidized bed reactors.After implementation into the Dyssol framework the models shall be validated with measurement at the TUHH pilot CLC-plant. Finally a technical CLC plant with a thermal power of 100 MWth will be simulated and analyzed with respect to its dynamic behavior. Of special interest for such analysis are the hot-start, the shutdown and the dynamics of load changes. Beside that simulation of a technical plant following the concept of TUHHs CLC-plant, other process configurations will be simulated and also the Chemical Looping Reforming process to study their dynamic behavior and to proof the flexibility of the simulation system.

该项目的目标是开发用于模拟互连流化床反应器系统的模型。该模型应该以合理的精度描述瞬态系统行为，同时对计算资源的需求较低。这应该允许具有再循环流的互连系统的迭代计算。仿真的目的是描述整个系统的动态行为，并优化整个系统，特别是负荷变化，启动和关闭的程序，分别。鼓泡和循环流化床反应器的单独模型将制定。作为反应，考虑了气体/固体和均相气体反应，无论气体体积是否发生变化。固体燃料的化学链燃烧过程应用作示例过程。模型最终应通过TUHH的CLC系统中的测量进行验证。本项目的一个重点是循环流化床新的半经验模型的制定、实施和验证。特别是流化床的动态行为的描述相比，当前的假设，即流体力学的瞬时采用的操作参数的变化将得到改善。采用MP-PIC方法的CFD计算应用于确定几何形状和尺寸的模型参数，这些几何形状和尺寸偏离经验确定参数的基础。为了便于参数确定过程，应在CFD模拟器与待开发模块之间实现数据交换接口。此外，应将焓平衡添加到反应器模型中。它将考虑到反应的热量以及热损失和热交换。焓的平衡将使模拟系统能够确定相互连接的流化床反应器的热行为。在Dyssol框架中实施后，应在TUHH中试CLC工厂通过测量验证模型。最后，将模拟和分析一个热功率为100 MWth的技术CLC工厂的动态行为。对这种分析特别感兴趣的是热启动、停机和负载变化的动态。除了根据TUHH CLC装置的概念模拟技术装置之外，还将模拟其他工艺配置以及化学回路重整工艺，以研究其动态行为并证明模拟系统的灵活性。