Abstract

The gasification process is among the hydrogen production methods finding ever increasing application in the world practice. In its industrial implementation, a steam-oxygen mixture is employed most often as a gasifying agent. However, superheated steam is more promising for this purpose, since water is a hydrogen donor. It is essential to have an oxygen-free gasifying agent. This not only saves fuel eliminating its oxidation in the gasification process but also reduces the cost of synthesis gas (syngas) due to the fact that energy-consuming air separation units for oxygen production are not needed. Superheated steam for the gasification process can be generated at thermal power plants of various thermal and electrical power. This will enable the superheated steam to be generated at conditions in a wide range of temperatures and pressures and with high flowrates as required for gas generators with high specific thermal power. This process was modeled in the Aspen Plus software package widely used for simulation of chemical process and power systems in many countries of the world. The gasification process is generally modeled using the RYield or RGibbs reactor. The effect of superheated steam temperature (750–965°С) and pressure (0.1 to 3.0 MPa) of the syngas composition is demonstrated. Depending on the superheated steam pressure and temperature, the generated syngas can be used as a fuel for power units (in power industry) or as a feedstock for the production of various chemicals, such as hydrogen and synthetic liquid fuel. Comparison of the simulation results with the published data revealed that their difference does not exceed 15%.

中文翻译：

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Aspen Plus软件包在生物质无氧蒸汽气化合成气成分模拟中的应用

摘要

气化过程是在世界实践中得到越来越多应用的氢气生产方法之一。在其工业实施中，最常使用蒸汽-氧气混合物作为气化剂。然而，过热蒸汽更适合用于此目的，因为水是氢供体。必须使用无氧气化剂。这不仅节省了燃料，消除了气化过程中的氧化，而且由于不需要用于氧气生产的耗能空气分离装置，因此降低了合成气（syngas）的成本。用于气化过程的过热蒸汽可以在各种火力和电力的热电厂中产生。这将使过热蒸汽能够在较宽的温度和压力范围内以及具有高比热功率的气体发生器所需的高流速的条件下产生。这个过程是在 Aspen Plus 软件包中建模的，该软件包广泛用于世界许多国家的化学过程和电力系统的模拟。气化过程通常使用 RYield 或 RGibbs 反应器建模。证明了过热蒸汽温度 (750–965°С) 和压力 (0.1 到 3.0 MPa) 对合成气成分的影响。根据过热蒸汽的压力和温度，产生的合成气可用作动力装置的燃料（电力工业）或用作生产各种化学品（如氢气和合成液体燃料）的原料。