首页|煤原位注入超临界水制氢升温阶段的热流耦合数值模拟研究

煤原位注入超临界水制氢升温阶段的热流耦合数值模拟研究

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地下煤层原位注入超临界水制氢是一种煤的新型转化技术.基于多孔介质多场耦合原理,提出了煤层原位注入超临界水升温阶段的热流耦合数学模型,采用数值模拟的方法对煤层及顶底板岩层的温度分布、孔隙压力等的演化规律进行了研究.结果表明:注入超临界水后,注入井附近温度和渗流速度迅速升高并逐渐向外扩展,随后温度继续升高至大约1050 ℃后不再升高,流速最高可达到5.89 cm/s,且随时间推移,注入井附近流速略有降低;生产井附近流速6个月前呈负指数增长,6个月后生产井附近温度和流速基本保持恒定;整体压力在1 a内缓慢升高,距离注入井700 m外温度在1 a内变化很小.
Study on the Numerical Simulation of Heat-Flow Coupling in the Heating Stage of Hydrogen Production by In-Situ Injection of Supercritical Water into Coal Seam
Hydrogen production by in-situ injection of supercritical water into underground coal seam is a new type of coal conversion technology.Based on the multi-field coupling principle of porous media,a mathematical model of heat flow coupling in the heating stage of in-situ injection of supercritical water into coal seam is proposed,The evolution law of temperature distribution as well as pore pressure of coal seam,roof and floor strata were studied by numerical simulation.The results show that after the injection of supercritical water,the temperature and seepage velocity near the injection well increase rapidly and gradually expand outward,and then the temperature continues to increase to about 1050 ℃ and no longer increases.The maximum flow rate can reach 5.89 cm/s,and the flow rate near the injection well decreases slightly with time.The flow velocity near the production well shows a negative exponential growth before 6 months,and the temperature and flow velocity near the production well remain basically constant after 6 months.The overall pressure increases slowly within 1 a,and the temperature outside 700 m from the injection well changes little within 1 a.

In-situ gasification of coalHydrogen production by supercritical waterHeating stageHeat-flow coupling modelNumerical simulation

张子翔、赵阳升、冯子军

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太原理工大学 矿业工程学院,山西太原 030024

太原理工大学原位改性采矿教育部重点实验室,山西太原 030024

煤原位气化 超临界水制氢 升温阶段 热流耦合模型 数值模拟

国家自然科学基金

52122405

2024

矿业研究与开发
长沙矿山研究院有限责任公司 中国有色金属学会

矿业研究与开发

CSTPCD北大核心
影响因子:0.763
ISSN:1005-2763
年,卷(期):2024.44(1)
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