不同等级煤的射频加热数值分析

IF 2.6 3区 工程技术 Q3 ENERGY & FUELS
Rui Liu, Xuelin Dong, D. Gao
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引用次数: 0

摘要

射频加热是开发煤层气的一种新型热采方法。人们对电磁加热对煤的物理性质的影响进行了各种各样的研究。然而,很少有研究考虑煤层地下采暖的工况。本文基于直井中电磁波传播与换热耦合计算煤层温度分布,研究煤层变质作用和热电特性对温度分布的影响。在传热方程和波动方程中分别考虑了与温度相关的储层热物性参数。数值模拟揭示了煤阶和热电性质对热效率的影响。结果表明:射频加热器附近温度较高,整个受热区呈椭圆形;褐煤等低变质煤的射频加热功能更强,加热范围更广,扩散系数增强均匀,热均匀性好。较高的导热系数、较低的比热容和含水饱和度可以扩大受热面积,降低井眼附近的温度,有利于维护井筒完整性。煤层相对介电常数在2.4 ~ 6.4之间时,对储层温度影响不大。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A numerical analysis of radio frequency heating of coal with different ranks
Radio-frequency (RF) heating is a novel thermal stimulation method in developing coalbed methane (CBM). Various research has been conducted on the effect of electromagnetic (EM) heating on the physical properties of coal. However, few studies considered the working conditions of underground coal seam heating. This paper calculates the coal seam temperature distribution based on the coupling between electromagnetic wave propagation and heat transfer in a vertical well to study the influence of coal seam metamorphism and thermoelectric characteristics on temperature distribution. The reservoir thermophysical parameters related to temperature are considered in the heat transfer and wave equations, respectively. Numerical simulations reveal the influence of coal ranks and thermo-electrical properties on heating efficacy. Results indicate that the temperature in the vicinity of the RF heater is relatively high, and the whole heated zone forms an elliptical shape. Low-metamorphism coal, such as lignite, is more functional for RF heating and has a broad heating range, leading to a uniform diffusion coefficient enhancement and good thermal homogeneity. Higher thermal conductivity, lower specific heat capacity, and water saturation can expand the heating area and reduce the temperature near the borehole, benefiting the maintenance of wellbore integrity. The coal seam relative permittivity has little effect on the reservoir temperature when its value is between 2.4 and 6.4.
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来源期刊
CiteScore
6.40
自引率
30.00%
发文量
213
审稿时长
4.5 months
期刊介绍: Specific areas of importance including, but not limited to: Fundamentals of thermodynamics such as energy, entropy and exergy, laws of thermodynamics; Thermoeconomics; Alternative and renewable energy sources; Internal combustion engines; (Geo) thermal energy storage and conversion systems; Fundamental combustion of fuels; Energy resource recovery from biomass and solid wastes; Carbon capture; Land and offshore wells drilling; Production and reservoir engineering;, Economics of energy resource exploitation
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