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简要介绍了我们近年来基于有限元法开展的地学计算研究新进展,重点在于原煤裂隙介质中微生物反应与流体流动耦合过程的数学模型及其在模拟微生物产气过程中的应用。原煤微生物产气过程包括以下四个主要阶段:水解,酸化,有机酸和醇类降解为乙酸,最后生成甲烷。该生化反应的主要成分是固态的煤和微生物,液态的降解煤、中间产物、醋酸和水,以及气态的CH4和CO2。基于质量守恒定律,导出了描述原煤微生物产气耦合过程的偏微分方程,在有限元软件PANDAS平台基础上求解,并应用于模拟和分析原煤中微生物产气过程。数值模拟结果表明了本文提出的算法的有效性。
In this paper, we briefly introduce the new progress of geo-computation based on the finite element method in recent years. The emphasis is on the mathematical model of the coupling process of microbial reactions and fluid flow in the fissure media and its application in the process of gas production by simulated microorganisms. Raw coal microbial gas production process includes the following four main stages: hydrolysis, acidification, organic acids and alcohols degradation of acetic acid, and finally generate methane. The main components of this biochemical reaction are solid-state coal and microorganisms, liquefied coal, intermediates, acetic acid and water, as well as gaseous CH4 and CO2. Based on the law of conservation of mass, partial differential equations describing the process of gas-generation coupling of raw coal microorganisms were derived and solved on the basis of finite element software PANDAS. The method was applied to simulate and analyze the gas production process of microorganisms in raw coal. Numerical simulation results show the effectiveness of the proposed algorithm.