Numerical Investigation of the Staged Gasification of Wet Wood

I. G. Donskoi; A. N. Kozlov; D. A. Svishchev; V. A. Shamanskii

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Numerical Investigation of the Staged Gasification of Wet Wood

机译：湿木分段气化的数值研究

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Gasification of wooden biomass makes it possible to utilize forestry wastes and agricultural residues for generation of heat and power in isolated small-scale power systems. In spite of the availability of a huge amount of cheap biomass, the implementation of the gasification process is impeded by formation of tar products and poor thermal stability of the process. These factors reduce the competitiveness of gasification as compared with alternative technologies. The use of staged technologies enables certain disadvantages of conventional processes to be avoided. One of the previously proposed staged processes is investigated in this paper. For this purpose, mathematical models were developed for individual stages of the process, such as pyrolysis, pyrolysis gas combustion, and semicoke gasification. The effect of controlling parameters on the efficiency of fuel conversion into combustible gases is studied numerically using these models. For the controlling parameter are selected heat inputted into a pyrolysis reactor, the excess of oxidizer during gas combustion, and the wood moisture content. The process efficiency criterion is the gasification chemical efficiency accounting for the input of external heat (used for fuel drying and pyrolysis). The generated regime diagrams represent the gasification efficiency as a function of controlling parameters. Modeling results demonstrate that an increase in the fraction of heat supplied from an external source can result in an adequate efficiency of the wood gasification through the use of steam generated during drying. There are regions where it is feasible to perform incomplete combustion of the pyrolysis gas prior to the gasification. The calculated chemical efficiency of the staged gasification is as high as 80-85%, which is 10- 20% higher that in conventional single-stage processes.

机译：木质生物质的气化使得利用林业废弃物和农业残余物在孤立的小型电力系统中产生热能和电力成为可能。尽管可获得大量廉价的生物质，但是由于焦油产物的形成和该方法的热稳定性差而阻碍了气化过程的实施。与替代技术相比，这些因素降低了气化的竞争力。使用分阶段技术可以避免传统工艺的某些缺点。本文研究了先前提出的分阶段过程之一。为此，针对该过程的各个阶段开发了数学模型，例如热解，热解气体燃烧和半焦气化。使用这些模型数值研究了控制参数对燃料转化为可燃气体效率的影响。对于控制参数，选择输入到热解反应器中的热量，气体燃烧过程中过量的氧化剂以及木材的水分含量。工艺效率标准是考虑外部热量输入（用于燃料干燥和热解）的气化化学效率。生成的状态图表示气化效率与控制参数的关系。建模结果表明，通过使用干燥过程中产生的蒸汽，从外部来源提供的热量分数的增加可以导致木材气化的足够效率。在气化之前，存在可以对热解气体进行不完全燃烧的区域。计算得出的分段气化的化学效率高达80-85％，比传统的单步工艺高10-20％。

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来源
《Thermal engineering》 |2017年第4期|258-264|共7页
作者
I. G. Donskoi; A. N. Kozlov; D. A. Svishchev; V. A. Shamanskii;
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作者单位

Kutateladze Thermophyscics Institute, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630090 Russia;

Melentiev Energy Systems Institute, Siberian Branch, Russian Academy of Sciences (ISEM SO RAN), Irkutsk, 664033 Russia;

Melentiev Energy Systems Institute, Siberian Branch, Russian Academy of Sciences (ISEM SO RAN), Irkutsk, 664033 Russia;

Melentiev Energy Systems Institute, Siberian Branch, Russian Academy of Sciences (ISEM SO RAN), Irkutsk, 664033 Russia;

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正文语种 eng
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staged gasification; wood biomass. mathematical modeling; regime maps;

机译：分阶段气化木材生物量。数学建模;政权地图;

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8. Gasification of Coal-Peat and Coal-Wood Chip Mixtures in the University of Minnesota, Two-Stage Coal Gasifier: Final Report. [R] . Lewis, R. P. 1986

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Numerical Investigation of the Staged Gasification of Wet Wood

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