不同压力和温度水平对液态 CO2-ECBM 效率的影响：从实验到现场测试

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2024-11-10 DOI:10.1016/j.csite.2024.105477

Gaoming Wei , Li Ma , Xin Yi , Hu Wen , Shangming Liu , Ruizhi Guo

{"title":"不同压力和温度水平对液态 CO2-ECBM 效率的影响：从实验到现场测试","authors":"Gaoming Wei , Li Ma , Xin Yi , Hu Wen , Shangming Liu , Ruizhi Guo","doi":"10.1016/j.csite.2024.105477","DOIUrl":null,"url":null,"abstract":"<div><div>This study focuses on the efficiency of liquid CO2 (LCO2) displacing CH4 in the coal under optimal Ti and Pi. The objective is to study the influence on the efficiency of LCO2 injection to displace CH4 under the different temperature (Ti) and pressure (Pi). Thereafter, an in-situ test is conducted on LCO2 injecting to enhance coalbed methane (LCO2-ECBM) in a high-gas coalbed. Results showed that low temperature inhibited the movement activity of CO2/CH4 in coal, a significant delayed effect is exhibited during CO2 displacing CH4, and the maximum displacement efficiency (ηmax) is only 56.02 %. The competitive-adsorption effect of CO2/CH4 intensified, and ηmax increased to 84.13 % as Ti gradually increased. The CH4 desorption rate and migration dynamics in the coal intensified as Pi increased, resulting in a significant increase in efficiency, and ηmax reached 92.87 %. At 30 °C, where CH4 is present in the coal, an appropriate increase in Pi caused the maximum replacement ratio to decrease from 1.60:1 to 0.40:1, indicating a higher efficiency. An In-situ test of LCO2-ECBM showed that the concentration and flow rate of methane increased by nearly three times, and the CBM extraction time and borehole layout number have been shortened by one-third and half, respectively.</div></div>","PeriodicalId":9658,"journal":{"name":"Case Studies in Thermal Engineering","volume":"64 ","pages":"Article 105477"},"PeriodicalIF":6.4000,"publicationDate":"2024-11-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Influence on the efficiency of liquid CO2-ECBM under the different pressure and temperature levels: From experimental to in-situ test\",\"authors\":\"Gaoming Wei , Li Ma , Xin Yi , Hu Wen , Shangming Liu , Ruizhi Guo\",\"doi\":\"10.1016/j.csite.2024.105477\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><div>This study focuses on the efficiency of liquid CO2 (LCO2) displacing CH4 in the coal under optimal Ti and Pi. The objective is to study the influence on the efficiency of LCO2 injection to displace CH4 under the different temperature (Ti) and pressure (Pi). Thereafter, an in-situ test is conducted on LCO2 injecting to enhance coalbed methane (LCO2-ECBM) in a high-gas coalbed. Results showed that low temperature inhibited the movement activity of CO2/CH4 in coal, a significant delayed effect is exhibited during CO2 displacing CH4, and the maximum displacement efficiency (ηmax) is only 56.02 %. The competitive-adsorption effect of CO2/CH4 intensified, and ηmax increased to 84.13 % as Ti gradually increased. The CH4 desorption rate and migration dynamics in the coal intensified as Pi increased, resulting in a significant increase in efficiency, and ηmax reached 92.87 %. At 30 °C, where CH4 is present in the coal, an appropriate increase in Pi caused the maximum replacement ratio to decrease from 1.60:1 to 0.40:1, indicating a higher efficiency. An In-situ test of LCO2-ECBM showed that the concentration and flow rate of methane increased by nearly three times, and the CBM extraction time and borehole layout number have been shortened by one-third and half, respectively.</div></div>\",\"PeriodicalId\":9658,\"journal\":{\"name\":\"Case Studies in Thermal Engineering\",\"volume\":\"64 \",\"pages\":\"Article 105477\"},\"PeriodicalIF\":6.4000,\"publicationDate\":\"2024-11-10\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Case Studies in Thermal Engineering\",\"FirstCategoryId\":\"5\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S2214157X24015089\",\"RegionNum\":2,\"RegionCategory\":\"工程技术\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q1\",\"JCRName\":\"THERMODYNAMICS\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Case Studies in Thermal Engineering","FirstCategoryId":"5","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S2214157X24015089","RegionNum":2,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"THERMODYNAMICS","Score":null,"Total":0}

引用次数: 0

摘要

本研究的重点是在最佳 Ti 和 Pi 条件下液态 CO2（LCO2）置换煤中 CH4 的效率。目的是研究在不同温度（Ti）和压力（Pi）条件下，液态二氧化碳注入对置换煤中 CH4 的效率的影响。随后，在高瓦斯煤层中进行了注入 LCO2 提高煤层气（LCO2-ECBM）的现场试验。结果表明，低温抑制了煤中 CO2/CH4 的运动活性，在 CO2 置换 CH4 的过程中表现出明显的延迟效应，最大置换效率（ηmax）仅为 56.02%。随着 Ti 的逐渐增加，CO2/CH4 的竞争吸附效应增强，ηmax 提高到 84.13 %。随着 Pi 的增加，煤中 CH4 的解吸速率和迁移动力学增强，导致效率显著提高，ηmax 达到 92.87 %。在 30 °C 时，煤中存在 CH4，适当增加 Pi 会使最大置换比从 1.60:1 降至 0.40:1，表明效率更高。LCO2-ECBM 的原位测试表明，煤层气的浓度和流速提高了近三倍，煤层气抽采时间和井眼布置数量分别缩短了三分之一和一半。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

查看原文本刊更多论文

Influence on the efficiency of liquid CO2-ECBM under the different pressure and temperature levels: From experimental to in-situ test

This study focuses on the efficiency of liquid CO₂ (LCO₂) displacing CH₄ in the coal under optimal T_i and P_i. The objective is to study the influence on the efficiency of LCO₂ injection to displace CH₄ under the different temperature (T_i) and pressure (P_i). Thereafter, an in-situ test is conducted on LCO₂ injecting to enhance coalbed methane (LCO₂-ECBM) in a high-gas coalbed. Results showed that low temperature inhibited the movement activity of CO₂/CH₄ in coal, a significant delayed effect is exhibited during CO₂ displacing CH₄, and the maximum displacement efficiency (η_max) is only 56.02 %. The competitive-adsorption effect of CO₂/CH₄ intensified, and η_max increased to 84.13 % as T_i gradually increased. The CH₄ desorption rate and migration dynamics in the coal intensified as P_i increased, resulting in a significant increase in efficiency, and η_max reached 92.87 %. At 30 °C, where CH₄ is present in the coal, an appropriate increase in P_i caused the maximum replacement ratio to decrease from 1.60:1 to 0.40:1, indicating a higher efficiency. An In-situ test of LCO₂-ECBM showed that the concentration and flow rate of methane increased by nearly three times, and the CBM extraction time and borehole layout number have been shortened by one-third and half, respectively.

求助全文

通过发布文献求助，成功后即可免费获取论文全文。去求助

来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.