固-液-气耦合作用下CO₂热功交换规律研究

Research on the Heat Work Exchange Law of CO₂ under Solid-Liquid-Gas Coupling Cooperation

摘要

在“双碳”战略背景下,探索CO₂高能利用作为研究碳减排及其发展能源新质生产力的关键科学问题,针对低渗煤层中孔隙连通率及底板所产生的致裂效果,提出一种新型超临界CO₂换热器,采用不同水温作为载热流体的研究方案,模拟研究了在不同水温与相同CO₂温度工况条件下,各流体温度变化及其热量传递变化影响,分析了CO₂致裂下煤层裂缝的连通率及煤层底板裂缝开度.结果表明:CO₂温升速率随着水温增加逐渐升高,且CO₂吸热温度与水温变化呈线性增长关系;CO₂传热系数由2.8×10⁴ W/(m²·K)增至7.4×10⁵ W/(m²·K),与水流初始温度的变化趋势相符;CO₂相变吸热和热功交换与初始水温之间存在良好的递进关系,水流热源功率受初始水温的显著影响;在水温与CO₂热做功共同影响下,随着初始水温升高,CO₂相变致裂程度表现出更大的热做功能量,相变致裂效果更佳.通过现场试验发现在水温100℃工况下与CO₂换热可以达到较好的卸压效果,巷道应力得到明显释放.通过工业试验,验证了深地钻孔中超临界CO₂换热器的性能表现,为超临界CO₂换热器的优化设计提供了依据.

Abstract

Under the background of the “dual carbon” strategy,exploring the high-energy utilization of CO₂ as a key scientific issue for researching carbon reduction and developing new energy productivity,a novel supercritical CO₂ heat exchanger is proposed in response to the pore connectivity rate in low-permeability coal seams and the fracturing effect produced by the floor.A research plan using different water temperatures as heat-carrying fluids is adopted to simulate and study the changes in fluid temperatures and heat transfer under different water temperatures and the same CO₂ temperature conditions,and to analyze the connectivity rate of coal seam fractures and the opening degree of floor fractures under CO₂ fracturing.The results show that the temperature rise rate of CO₂ gradually increases with the increase in water temperature,and there is a linear growth relationship between the heat absorption temperature of CO₂ and the change in water temperature; the heat transfer coefficient of CO₂ increases from 2.8×10⁴ W/(m²·K) to 7.4×10⁵ W/(m²·K),which is consistent with the trend of the initial water temperature; there is a good progressive relationship between the phase change heat absorption and thermal work exchange of CO₂ and the initial water temperature,and the power of the water heat source is significantly affected by the initial water temperature; under the combined influence of water temperature and CO₂ thermal work,as the initial water temperature increases,the phase change fracturing degree of CO₂ shows greater thermal work energy,and the phase change fracturing effect is better.Field tests have found that under the condition of 100℃ water temperature,the heat exchange with CO₂ can achieve a better pressure relief effect,and the stress in the roadway is significantly released.Performance of supercritical CO₂ heat exchanger in deep borehole isverified by the industrial test,which provides a basis for the optimal design of supercritical CO₂ heat exchangers.

关键词

低渗煤层 / 煤层致裂 / CO₂换热器 / CO₂热功交换 / CO₂相变吸热

Key words

low permeability coal seam / coal seam cracking / CO₂ heat exchanger / CO₂ thermal power exchange / CO₂ phase change heat absorption

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基金资助

霍英东教育基金项目(71076)

陕西省自然科学基础研究计划项目(2019JLP09)

新疆生产建设兵团重点领域科技攻关计划项目(2019AB001)