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Thermodynamic Performance Analysis of Geothermal Power Plant Based on Organic Rankine Cycle (ORC) Using Mixture of Pure Working Fluids
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作者 Abdul Sattar Laghari Mohammad Waqas Chandio +1 位作者 Laveet Kumar Mamdouh El Haj Assad 《Energy Engineering》 EI 2024年第8期2023-2038,共16页
The selection of working fluid significantly impacts the geothermal ORC’s Efficiency.Using a mixture as a working fluid is a strategy to improve the output of geothermal ORC.In the current study,modelling and thermod... The selection of working fluid significantly impacts the geothermal ORC’s Efficiency.Using a mixture as a working fluid is a strategy to improve the output of geothermal ORC.In the current study,modelling and thermodynamic analysis of ORC,using geothermal as a heat source,is carried out at fixed operating conditions.The model is simulated in the Engineering Equation Solver(EES).An environment-friendly mixture of fluids,i.e.,R245fa/R600a,with a suitable mole fraction,is used as the operating fluid.The mixture provided the most convenient results compared to the pure working fluid under fixed operating conditions.The impact of varying the evaporator pressure on the performance parameters,including energy efficiency,exergy efficiency and net power output is investigated.The system provided the optimal performance once the evaporator pressure reached the maximum value.The efficiencies:Energy and Exergy,and Net Power output of the system are 16.62%,64.08%and 2199 kW for the basic cycle and 20.72%,67.76%and 2326 kW respectively for the regenerative cycle. 展开更多
关键词 Organic rankine cycle internal heat exchanger moderate-temperature geothermal source mixture of the fluid EXERGY
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Research on basic characteristics of ~2H, ^(18)O and ^(14)C in geothermal fluid in Guangdong Province, China 被引量:2
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作者 ZENG Tu-rong 《Journal of Groundwater Science and Engineering》 2019年第1期42-52,共11页
In general, previous geothermal geochemical studies in Guangdong Province mainly involves single method to cover limited aspects and areas. In that way, various methods available cannot actually provide more convincin... In general, previous geothermal geochemical studies in Guangdong Province mainly involves single method to cover limited aspects and areas. In that way, various methods available cannot actually provide more convincing results of geothermal fluid's circulation system and evolution process from different dimensions, especially in terms of isotope. As a result, more comprehensive researches remain to be done on geochemistry of geothermal fluid, in particular, the space-time law of isotope's evolution pattern as well as recharge cycle. Based on data of environmental isotopes(~2H and ^(18)O) and the isotope of radiometric dating(^(14)C), geothermal geology, characteristics of groundwater flow field and types of goethermal reservior in Guangdong Province are taken into account in this paper, so as to analyze numerical rule and spatial distribution features of isotopes. Thus, corresponding main causes, mechanism and hydrogeological significance can be revealed to further study the potential of geothermal fluid to renew and recharge in the long run, which is conducive to enrich geothermal theories and solve existing hydrogeological problems. 展开更多
关键词 geothermal fluid ISOTOPE CHARACTERISTICS TYPES of geothermal reservior
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Reconstruction of deep fluid chemical constituents for estimation of geothermal reservoir temperature using chemical geothermometers 被引量:1
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作者 LIU Yan-guang LIU Bing +2 位作者 LU Chuan ZHU Xi WANG Gui-ling 《Journal of Groundwater Science and Engineering》 2017年第2期173-181,共9页
This paper elaborates the chemical constituent change principles of deep geothermal fluid during the process of upward movement. It summarizes research methods of hydrochemistry, isotope and numerical modelling techni... This paper elaborates the chemical constituent change principles of deep geothermal fluid during the process of upward movement. It summarizes research methods of hydrochemistry, isotope and numerical modelling technique for the physiochemical processes such as decreasing temperature, shallow groundwater infusion, and degassing. The multi-component chemical geothermometry methods including gas geochemical method are discussed. High-temperature geothermal fields in China are mostly located in the southwest with frequent new tectonic movements, especially in Tibet high-temperature geothermal areas. Therefore the paper also focuses the status of high-temperature geothermal fluid research. At last, it's pointed out in the paper that in the future we can start from typical high-temperature geothermal zones and geothermal fields to explore optimization of the multi-component geothermometry method and use it in the reconstruction and analogue of the formation mechanism and internal relevancy of regional geothermal systems. 展开更多
关键词 High temperature geothermal fluid Multi-component geothermometer optimization geothermal gases ANALOGUE
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The Coupled Effects of Dryness and Non-condensable Gas Content of Geothermal Fluid on the Power Generation Potential of an Enhanced Geothermal System
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作者 LI Tailu LI Xuelong +1 位作者 JIA Yanan GAO Xiang 《Acta Geologica Sinica(English Edition)》 SCIE CAS CSCD 2021年第6期1948-1957,共10页
The Enhanced Geothermal System(EGS) is a recognized geothermal exploitation system for hot dry rock(HDR), which is a rich resource in China. In this study, a numerical simulation method is used to study the effects of... The Enhanced Geothermal System(EGS) is a recognized geothermal exploitation system for hot dry rock(HDR), which is a rich resource in China. In this study, a numerical simulation method is used to study the effects of geothermal fluid dryness and non-condensable gas content on the specific enthalpy of geothermal fluid. Combined with the organic Rankine cycle(ORC), a numerical model is established to ascertain the difference in power generation caused by geothermal fluid dryness and non-condensable gas content. The results show that the specific enthalpy of geothermal fluid increases with the increase of geothermal fluid temperature and geothermal fluid dryness. If the dryness of geothermal fluid is ignored, the estimation error will be large for geothermal fluid enthalpy. Ignoring non condensable gas will increase the estimation of geothermal fluid enthalpy, so the existence of the non-condensable gas tends to reduce the installed capacity of a geothermal power plant. Additionally, both mass flow of the working medium and net power output of the ORC power generation system are increased with increasing dryness of geothermal fluid, however there is some impact of geothermal fluid dryness on thermal efficiency. 展开更多
关键词 hot dry rock geothermal fluid DRYNESS non-condensable gas organic Rankine cycle
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GEOTHERMAL FLUID MINERALIZATION──A NEW HYDROTHERMAL MINERALIZATION MODEL
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作者 ZHANG Skugen and DAI Tagen(Department of Geology, Central South University of Technology, Changsha, 410083,China) 《Geotectonica et Metallogenia》 1997年第Z2期72-77,共6页
In hydrothermal mineralization regime, there should be some other models besideS the commonly accepted traditional magmatic and metamorphic hydrothermal ones. The authors suggest a new model named as geothermal nuid m... In hydrothermal mineralization regime, there should be some other models besideS the commonly accepted traditional magmatic and metamorphic hydrothermal ones. The authors suggest a new model named as geothermal nuid mineralization and believe it is an important and distinguishable hydrotherma1 mineralization model. The discussions are focused on several aspects of the new model in its distinguishing features in essential factors of hydrothermal mineralization, essential metallogenic conditions, common metallogenic characteristics, general mineralization process,geotectonic control and metallogenic importance. 展开更多
关键词 geothermal fluid HYDROTHERMAL MINERALIZATION MODEL
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Geothermal energy exploitation from depleted high-temperature gas reservoirs by recycling CO_(2): The superiority and existing problems 被引量:8
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作者 Guodong Cui Shaoran Ren +1 位作者 Bin Dou Fulong Ning 《Geoscience Frontiers》 SCIE CAS CSCD 2021年第6期428-443,共16页
CO_(2) can be used as an alternative injectant to exploit geothermal energy from depleted high-temperature gas reservoirs due to its high mobility and unique thermal properties.However,there has been a lack of systema... CO_(2) can be used as an alternative injectant to exploit geothermal energy from depleted high-temperature gas reservoirs due to its high mobility and unique thermal properties.However,there has been a lack of systematic analysis on the heat mining mechanism and performance of CO_(2),as well as the problems that may occur during geothermal energy exploitation at specific gas reservoir conditions.In this paper,a base numerical simulation model of a typical depleted high-temperature gas reservoir was established to simulate the geothermal energy exploitation processes via recycling CO_(2) and water,with a view to investigate whether and/or at which conditions CO_(2) is more suitable than water for geothermal energy exploitation.The problems that may occur during the CO_(2)-based geothermal energy exploitation were also analyzed along with proposed feasible solutions.The results indicate that,for a depleted low-permeability gas reservoir with dimensions of 1000 m×500 m×50 m and temperature of 150℃ using a single injection-production well group for 40 years of operation,the heat mining rate of CO_(2) can be up to 3.8 MW at a circulation flow rate of 18 kg s^(-1)due to its high mobility along with the flow path in the gas reservoir,while the heat mining rate of water is only about 2 MW due to limitations on the injectivity and mobility.The reservoir physical property and injection-production scheme have some effects on the heat mining rate,but CO_(2)always has better performance than water at most reservoir and operation conditions,even under a high water saturation.The main problems for CO_(2) circulation are wellbore corrosion and salt precipitation that can occur when the reservoir has high water saturation and high salinity,in which serious salt precipitation can reduce formation permeability and result in a decline of CO_(2) heat mining rate (e.g.up to 24%reduction).It is proposed to apply a low-salinity water slug before CO_(2)injection to reduce the damage caused by salt precipitation.For high-permeability gas reservoirs with high water saturation and high salinity,the superiority of CO_(2) as a heat transmission fluid becomes obscure and water injection is recommended. 展开更多
关键词 Depleted high-temperature gas reservoir Heat transmission fluid geothermal energy exploitation CO_(2) Salt precipitation
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O,H,and Sr isotope evidence for origin and mixing processes of the Gudui geothermal system,Himalayas,China 被引量:8
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作者 Chenguang Wang Mianping Zheng +4 位作者 Xuefei Zhang Enyuan Xing Jiangyi Zhang Jianhong Ren Yuan Ling 《Geoscience Frontiers》 SCIE CAS CSCD 2020年第4期1175-1187,共13页
Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China's Mainland.Located about 150 km southeast of Lhasa City,the capital of Tibe... Tho Gudui geothermal field records the highest temperature at equivalent borehole depths among the lainland hydrothermal systems in China's Mainland.Located about 150 km southeast of Lhasa City,the capital of Tibet,the Gudui geothermal field belongs to the Sangri-Cuona rift belt,also known as the Sangri-Cuona geothermal belt,and is representative of the non-volcanic geothermal systems in the Himalayas.In this study,oxygen-18 and deuterium isotope compositions as well as 87Sr/86Sr ratios of water samples collected from the Gudui geothermal field were characterized to understand the origin and mixing processes of the geothermal fluids at Gudui.Hydrogen and oxygen isotope plots show both,deep and shallow reservoirs in the Gudui geothermal field.Deep geothermal fluids are the mixing product of magmatic and infiltrating snow-melt water.Calculations show that the magma fluid component of the deep geothermal fluids account for about 21.10%-24.04%;magma fluids lay also be a contributing source of lithium.The linear relationship of the 87Sr/86Sr isotopic ratio versus the 1/Sr plot indicates that shallow geothermal fluids form from the mixing of deep geothermal fluids with cold groundwater.Using a binary mixing model with deep geothermal fluid and cold groundwater as two end-members,the nixing ratios of the latter in most surface hot springs samples were calculated to be between 5% and 10%.Combined with basic geological characteristics,hydrogen and oxygen isotope characteristics,strontium concentration,87Sr/(86)Sr ratios,and the binary mixing model,we infer the 6 th-Class Reservoirs Evolution Conceptual Model(6-CRECM) for the Gudui geothermal system.This model represents an idealized summary of the characteristics of the Gudui geothermal field based on our comprehensive understanding of the origin and mixing processes of the geothermal fluid in Gudui.This study may aid in identifying the geothermal and geochemical origin of the Gudui high-temperature hydrothermal systems in remote Tibet of China,whose potential for geothermal development and utilization is enormous and untapped. 展开更多
关键词 geothermal fluid Oxygen-18 and deuterium isotope 87Sr/86Sr ratio Origin and mixing Gudui HIMALAYAS
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Convective heat transfer of water flow in intersected rock fractures for enhanced geothermal extraction 被引量:3
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作者 Yuedu Chen Zhihong Zhao Huan Peng 《Journal of Rock Mechanics and Geotechnical Engineering》 SCIE CSCD 2022年第1期108-122,共15页
Numerous intersected rock fractures constitute the fracture network in enhanced geothermal systems.The complicated convective heat transfer behavior in intersected fractures is critical to the heat recovery in fractur... Numerous intersected rock fractures constitute the fracture network in enhanced geothermal systems.The complicated convective heat transfer behavior in intersected fractures is critical to the heat recovery in fractured geothermal reservoirs.A series of three-dimensional intersected fracture models is constructed to perform the flow-through heat transfer simulations.The geometry effects of dead-end fractures(DEFs)on the heat transfer are evaluated in terms of intersected angles,apertures,lengths,and the connectivity.The results indicate that annular streamlines appear in the rough DEF and cause an ellipse distribution of the cold front.Compared to plate DEFs,the fluid flow in the rough DEF enhances the heat transfer.Both the increment of outlet water temperatureΔToutand the ratio of heat production Qrpresent the largest at the intersected angle of 90°while decline with the decrease of the intersected angle between the main flow fracture(MFF)and the DEFs.The extension of the length of intersected DEFs is beneficial to heat production while enhancing its aperture is not needed.Solely increasing the number of intersected DEFs induces a little increase of heat extraction,and more significant heat production can be obtained through connecting these DEFs with the MFF forming the flow network. 展开更多
关键词 Heat transfer Fracture intersection fluid flow Rough fracture geothermal extraction
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Seepage-heat transfer coupling process of low temperature return water injected into geothermal reservoir in carbonate rocks in Xian County,China 被引量:2
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作者 WANG Yan LIU Yan-guang +3 位作者 BIAN Kai ZHANG Hong-liang QIN Shen-jun WANG Xiao-jun 《Journal of Groundwater Science and Engineering》 2020年第4期305-314,共10页
Fracture seepage and heat transfer in the geothermal reservoir of carbonate rocks after the reinjection of low temperature geothermal return water is a complex coupling process,which is also the frontier of geothermal... Fracture seepage and heat transfer in the geothermal reservoir of carbonate rocks after the reinjection of low temperature geothermal return water is a complex coupling process,which is also the frontier of geothermal production and reinjection research.Based on the research of cascade comprehensive development of geothermal resources in Beijing-Tianjin-Hebei(Xian County),the carbonate geothermal reservoir of Wumishan formation in the geothermal field in Xian County is investigated.With the development of the discrete fracture network model and the coupling model of seepage and heat transfer,the numerical solution of seepage field and temperature field with known fracture network is reached using the finite element software COMSOL,and the coupling process of seepage flow and heat in carbonate rocks is revealed.The results show that the distribution of temperature field of fractured rocks in geothermal reservoir of carbonate rocks has strong non-uniformity and anisotropy.The fracture network is interpenetrated,which constitutes the dominant channel of water conduction,and along which the fissure water moves rapidly.Under the influence of convective heat transfer and conductive heat transfer,one of the main factors to be considered in the study of thermal breakthrough is to make the cold front move forward rapidly.When the reinjection and production process continues for a long time and the temperature of the geothermal reservoir on the pumping side drops to a low level,the temperature of bedrocks is still relatively high and continues to supply heat to the fissure water,so that the temperature of the thermal reservoir on the pumping side will not decrease rapidly to the water temperature at the inlet of reinjection,but will gradually decrease after a long period of time,showing an obvious long tail effect.The distribution of fractures will affect the process of seepage and heat transfer in carbonate reservoirs,which should be considered in the study of fluid thermal coupling in carbonate reservoirs. 展开更多
关键词 Carbonate reservoir geothermal reinjection Fractured rock mass fluid thermal coupling
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Geothermal occurrence analysis of Dongying Formation in Tanggu area of Tianjin 被引量:2
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作者 LIU Jiulong JIN Baozhen +3 位作者 LI Yuanyuan WANG Jige YUE Liyan WANG Xi 《Global Geology》 2014年第3期163-169,共7页
Based on introducing geological structure of Tanggu area, the authors analyzed the sedimentary environment of Paleogene Dongying Formation, and further analyzed its geothermal occurrence. The studied area spans two gr... Based on introducing geological structure of Tanggu area, the authors analyzed the sedimentary environment of Paleogene Dongying Formation, and further analyzed its geothermal occurrence. The studied area spans two grade IV tectonic units which are Beitang depression and Banqiao depression. The studied area is mainly located in the Tanggu nose-like structure which is the secondary structure of Beitang depression. Its existence affects the sedimentary distribution of the part strata of Paleogene. The depositions of Dongying Ⅲ ( SQEd3 ) and Dongying Ⅱ ( SQEd2 ) are mainly delta front facies and lake sand bars which are propitious to the geothermal fluid enrichment. The favorable enrichment region of geothermal fluid is located in south Hetou- Tanggu. Most of Dongying Ⅰ ( SQEd1 ) changes into swamp plain deposition, only the northeast part of this area is the distributary riverway facies with developed sand layers. There is the favorable enrichment region of geothermal fluid. The hydraulic connection is weak among the geothermal reservoirs of Dongying Formation and its overlying Guantao and Minghuazhen formations. The underlying Shahejie Formation geothermal reservoir pro- vides a steady stream of fluid supply and ground pressure protection for Dongying Formation geothermal reservoir. 展开更多
关键词 Dongying Formation sedimentary environment geothermal fluid enrichment condition hydraulicconnection Tanggu area
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Geochemical genesis of geothermal waters from the Longling hydrothermal area, Yunnan, Southwestern China
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作者 GUO Qing-hai ZHANG Xiao-bo +6 位作者 LIU Ming-liang LI Jie-xiang ZHOU Chao ZHANG Can-hai ZHU Ming-cheng GUO Wei WANG Yan-xin 《Journal of Groundwater Science and Engineering》 2015年第3期213-221,共9页
Longling is characterized by a wide distribution of hydrothermal areas, among which the Banglazhang hydrothermal system is the most geothermally active. Banglazhang is marked by intensive hydrothermal activities inclu... Longling is characterized by a wide distribution of hydrothermal areas, among which the Banglazhang hydrothermal system is the most geothermally active. Banglazhang is marked by intensive hydrothermal activities including hot springs, geysers, fumaroles and hydrothermal explosions. The geothermal waters from the Longling region are mainly HCO3-Na type with low but comparable SO4 and Cl concentrations. Calculations based on a variety of chemical geothermometers and a K-Ca geobarometer indicate that the Banglazhang hydrothermal system has much higher subsurface temperature and CO2 pressure compared to the other systems such as Daheba, Dazhulin and Huangcaoba. However, geothermal water samples collected from all these alternative hydrothermal areas are either partially equilibrated with reservoir minerals or are immature. The silica-enthalpy relationships of Banglazhang geothermal waters indicate the presence of a deep geothermal fluid with an enthalpy value and silica concentration of 945 J/g(up to around 220 °C) and 339 mg/L. Our work indicates the Banglazhang area is a promising source in terms of long-term utilization of hydrothermal resources. 展开更多
关键词 geothermal water Geochemical genesis geothermOMETER GEOBAROMETER Deep geothermal fluid Longling Banglazhang
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Organic Rankine Cycle Based Geothermal Energy for Power Generation in Egypt
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作者 Doaa M. Atia Hanaa M. Farghally +1 位作者 Ninet M. Ahmed Hanaa T. El-Madany 《Energy and Power Engineering》 2017年第12期814-828,共15页
Low temperature geothermal resources are located in many areas and represent a high potential energy resource. One of the most common technologies, efficient and to exploit this type of resource is the binary cycle te... Low temperature geothermal resources are located in many areas and represent a high potential energy resource. One of the most common technologies, efficient and to exploit this type of resource is the binary cycle technology. Organic Rankine Cycle (ORC) is one of the main types of binary cycles. Electricity generation from low enthalpy geothermal energy using ORC is a talented technology. This paper addresses the design of binary cycle power plant utilizing one of the low temperature geothermal resource of temperature 92°C using four alternative working fluids: Butane, Isobutane, Pentane and 1,1,1,3,3-Pentafluoropropan (R245fa). Bir Nabi is the well under consideration which located in the Eastern desert, Egypt. Three operation parameters: geothermal temperature, reinjection temperature and geothermal flow rate are taken into consideration to analyze the performance of the power plant for different fluids. A performance analysis is conducted on ORC binary power plant using MATLAB programming to study the variation of output power and efficiency with the operation parameters. Also, the effect of these parameters on the area of ORC binary cycle power plant components;preheater, evaporator and condenser is presented. The geothermal resources temperatures are in the range of 90°C to130°C, the mass flow rate of the geothermal fluid ranges between 10 kg/s and 50 kg/s and reinjection temperature ranges from 30°C to 70°C. The results indicate that, the highest output power and plant efficiency are obtained with Pentane. 展开更多
关键词 geothermal Energy Working fluid ORGANIC Rankine CYCLE BINARY Power Plant
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Reservoir Processes Related to Exploitation in Los Azufres (México) Geothermal Field Indicated by Geochemical and Production Monitoring Data
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作者 Víctor Manuel Arellano Rosa María Barragán +5 位作者 Miguel Ramírez Siomara López Alfonso Aragón Adriana Paredes Emigdio Casimiro Lisette Reyes 《International Journal of Geosciences》 2015年第9期1048-1059,共12页
A combined analysis of geochemical and production data of 39 wells of the Los Azufres (Mexico) geothermal field (227.4 MWe) over time was developed to investigate the exploitation-related processes for 2003-2011. In t... A combined analysis of geochemical and production data of 39 wells of the Los Azufres (Mexico) geothermal field (227.4 MWe) over time was developed to investigate the exploitation-related processes for 2003-2011. In the south zone, important effects of reinjection were observed through Cl increases in some wells (up to 8000 mg/kg) while in wells with significant boiling, Cl has decreased. In most of the north zone wells, the variations in gas data indicated boiling and condensation of a highly gas-depleted brine, which seems to consist of reinjection fluids. It is suggested that this process maintains the production in the zone relatively stable. The main reservoir exploitation-related processes found were: 1) production of reinjection returns;for this, it was possible to distinguish a) wells that produce liquid and steam from injection, and b) wells that produce steam from injection and sometimes condensed steam from injection;2) boiling: two types of boiling were identified: a) boiling with steam gain, and b) boiling with steam loss. The results indicated that an effective reservoir recharge occurs since very moderate production declining rates were found. 展开更多
关键词 LOS Azufres geothermal Field WELL Simulation fluid Geochemistry WELL Bottom Conditions PRODUCTION WELLS
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Performance Simulation of a Modified Geothermal Grain Dryer Based at Menengai Well 3 in Kenya
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作者 Levi Kulundu Hiram Ndiritu +1 位作者 Gareth Kituu James Kimotho 《World Journal of Engineering and Technology》 2022年第1期59-87,共29页
Geothermal energy can be effectively utilized for grain drying to reduce carbon emissions and also cut operational costs associated with conventional methods. The main challenges encountered in the use of the geotherm... Geothermal energy can be effectively utilized for grain drying to reduce carbon emissions and also cut operational costs associated with conventional methods. The main challenges encountered in the use of the geothermal grain dryer, such as in Menengai, Kenya, include uneven grain drying and long throughput times. Grains near the hot air inlet dry at a faster rate compared to those near the exhaust end. Therefore, the grains must be recirculated within the dryer to achieve uniform moisture distribution. Grain recirculation is energy-intensive as it utilizes electricity running the elevator motors in addition to the suction pump. A Computational Fluid Dynamics (CFD) model was developed to study the airflow pattern and its impact on drying of maize. The model was simulated in ANSYS 21 and validated using experimental data. Finite volume discretization method was employed for meshing. Pressure-based segregated solver was used in the Computational Fluid Dynamics (CFD) simulation. Also, K-Omega turbulent model was used for enhancing wall treatment. The findings indicate that non-uniform hot air distribution across the grain buffer section causes uneven drying. Introducing filleted flow-guides results in a relatively uniform velocity, temperature, and turbulence kinetic energy distribution across the dryer. The average velocity and temperature magnitudes in lower compartments increased by 153.3% and 0.25% respectively for the improved dryer. In the upper compartments, the velocity and temperature increase were 176.5% and 0.22% respectively. 展开更多
关键词 Filleted Flow-Guides Flow Distribution geothermal Grain Dryer Computational fluid Dynamics
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深层地热能丛式多分支U型井采热技术及传热算法
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作者 李守定 张苏鹏 +8 位作者 徐涛 张召彬 郑博 马世伟 孔彦龙 张文秀 赫建明 庞忠和 李晓 《工程地质学报》 CSCD 北大核心 2024年第4期1397-1411,共15页
深层地热能是一种分布广、资源量大具有发展前景的可再生新能源,当前的主要开采方法有增强型地热系统(EGS)、环绕式井筒换热系统(AGS)、断层带流体循环开采和同轴套管开采法,但存在采热功率不稳定、地震风险高和采热效率低等难题。针对... 深层地热能是一种分布广、资源量大具有发展前景的可再生新能源,当前的主要开采方法有增强型地热系统(EGS)、环绕式井筒换热系统(AGS)、断层带流体循环开采和同轴套管开采法,但存在采热功率不稳定、地震风险高和采热效率低等难题。针对当前深层地热开采技术面临的瓶颈问题,本文以开采过程只有能量交换而没有物质交换为原则,以深层干热岩地热规模化可持续稳定开发为目标,提出了深层地热能丛式多分支U型井采热方法(UMW-DGS)及关键技术,在此基础上建立了井筒轴对称热传导模型,以青海共和盆地恰卜恰深部干热岩储层为背景,提出了高温高压岩石热导率测试新方法,计算了在定井径条件下井周温度场和采热功率的时空演化规律,分析了温度差、热导率和井径等3个敏感因素对采热功率的影响。此外,针对UMW-DGS定解问题,研发了基于有限体积法(FVM)的三维热流固耦合数值算法,研究了UMW-DGS单水平井段换热效率和在不同泵注量条件下温度场时空演化。通过分析不同流量的有效换热量、换热时长和功率发现:泵注流量的增加会导致有效换热能量和有效换热时长的降低,并且使有效换热功率先增加后减少。研究结果表明,深层地热能开发需要在平衡换热温度和功率的条件下设计注入排量,从而得到最优的换热效果。 展开更多
关键词 深层地热 丛式多分支U型井 高温高压岩石热导率 储层-工质流固耦合热传导算法
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贵州省地热流体资源可开采资源量研究
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作者 易世友 李强 +1 位作者 陈刚 吉勒克补子 《地下水》 2024年第1期85-88,共4页
综合贵州省地热研究相关成果资料,分析贵州省地热流体资源赋存条件及地热水资源分布特征,以此为基础将贵州省划分为110个地热资源量估算区,参照省内地热流体资源主要集中在断裂带周边的实际特点,采用设计布井法、泉(井)流量统计法和比... 综合贵州省地热研究相关成果资料,分析贵州省地热流体资源赋存条件及地热水资源分布特征,以此为基础将贵州省划分为110个地热资源量估算区,参照省内地热流体资源主要集中在断裂带周边的实际特点,采用设计布井法、泉(井)流量统计法和比拟法对贵州地热流体可开采资源量进行估算。结果表明:贵州地热流体资源的形成和分布,受省内地质构造特点及其在全国构造所处部位的控制,地热资源成因类型可划分为沉积盆地传导型地热储和隆起山地断裂对流型地热储,总体热储温度一般小于90℃,为低温地热资源;估算出贵州省地热流体可开采资源总量为23190.37 m^(3)/a,其中设计布井法估算的资源量为15926.22 m^(3)/a,天然温泉可开采资源量1183.34 m^(3)/a,地热井可开采资源量6080.80 m^(3)/a,总热能906933.97 Kw,年开采累计可利用热能量476.68×10^(8)MJ。所估算的地热流体可采资源量可为贵州省地热资源的勘查开发规划提供参考依据。 展开更多
关键词 地热流体 可开采资源量 设计布井法 泉(井)流量统计法 贵州省
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承德北部茅荆坝地热田地热流体的水化学和同位素特征及其成因 被引量:1
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作者 庞菊梅 王英男 +5 位作者 金爱芳 邵海 殷志强 万利勤 殷秀兰 于军 《水文地质工程地质》 CSCD 北大核心 2024年第1期224-236,共13页
承德北部茅荆坝地区地表出露的地热水温度高达98.7℃,赋存于裂隙较发育的侏罗世中粗粒二长花岗岩热储,SO_(4)^(2-)含量较高,但关于该区地热流体的补给来源、循环演化过程与成因机制研究尚少。为了认识该基岩山区地热系统的成因以合理开... 承德北部茅荆坝地区地表出露的地热水温度高达98.7℃,赋存于裂隙较发育的侏罗世中粗粒二长花岗岩热储,SO_(4)^(2-)含量较高,但关于该区地热流体的补给来源、循环演化过程与成因机制研究尚少。为了认识该基岩山区地热系统的成因以合理开发利用地热资源,在区域地热地质调查的基础上,测试分析了不同水体的水化学组分、地下水年龄(^(3)H和^(14)C)、硫酸盐硫、氧同位素(δ^(34) S-SO_(4)^(2-)和δ^(18) O-SO_(4)^(2-))、碳酸盐碳同位素(δ^(13)C-HCO_(3)^(-))、锶同位素(^(87)Sr、^(86)Sr)等特征值。结果表明:(1)茅荆坝地区地热水化学类型以SO_(4)-Na型为主,硅酸盐矿物的溶解及阳离子交换作用促进了地热水中Na^(+)、K^(+)和SiO_(2)的富集,水中SO_(4)^(2-)并非来源于硫酸盐岩矿物溶解,推测为H_(2)S气体从深部还原环境上升到浅部氧化后生成SO_(4)^(2-),也可能来源于高温地热水与硫反应形成的硫酸盐;(2)地热水n(^(87)Sr)/n(^(86)Sr)均值为0.7092,与海相碳酸盐岩比值接近,揭示热储深部可能存在海相碳酸盐岩储层;(3)地热水属于古地下水,^(14)C校正年龄为11.9~14.9 ka,循环更新能力差,由周边山区的大气降水补给,补给高程在1532~1632 m;(4)地热系统深部热储温度为142~144℃,高温中心位于热田北部。研究结果对冀北山地地热资源的可持续开发利用具有重要意义。 展开更多
关键词 茅荆坝地热田 流体循环 地热水年龄 硫同位素 热储温度
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亚东-谷露断裂带中北段地热流体碳硫硼同位素特征 被引量:2
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作者 张健 郝伟林 +1 位作者 巴桑元旦 张松 《世界核地质科学》 CAS 2024年第1期129-140,共12页
亚东—谷露断裂带中北段地热系统深循环过程十分复杂,对该区域地热资源的评估具有较大影响。加深对地热水起源、演化和循环过程的研究,对地热资源的勘探和开发具有较大的意义。地热流体中碳硫硼稳定同位素特征分析是研究地热水来源、地... 亚东—谷露断裂带中北段地热系统深循环过程十分复杂,对该区域地热资源的评估具有较大影响。加深对地热水起源、演化和循环过程的研究,对地热资源的勘探和开发具有较大的意义。地热流体中碳硫硼稳定同位素特征分析是研究地热水来源、地热水循环深度和地热水作用过程的方法之一。对亚东—谷露断裂带中北段地热水进行了系统性采样,测量了碳硫硼同位素。进行了碳硫硼同位素分析,结果显示:稳定同位素特征源于地热流体对围岩和地层的淋滤作用和水-岩相互作用。该地热系统中碳的主要来源为碳酸盐的溶解,与区域上分布的碳酸盐地层有关。谷露和续迈地热田δ^(34)S具有较大的分散性,显示出硫来源的非单一性,δ^(34)S均在大气碳酸盐和蒸发碳酸盐范围内,δ^(34)S同位素的来源为大气降水和热储层中的硫酸盐矿物。谷露地热田具有较低的δ^(11)B值和较低的Cl/B比值,较高的硼含量,且硼含量和硼同位素值相对集中,表明硼主要源于地热流体对围岩的淋滤作用。大气降水和冰雪融水中硼含量极少,主要起到对地热水中硼含量的稀释作用,不改变地热水中的δ^(11)B值。本研究的结果验证了亚东—谷露断裂带中北段地热系统地下热水的起源主要为大气降水,在深循环过程中存在少量岩浆流体的混入。 展开更多
关键词 亚东—谷露断裂带中北段 地热流体 碳硫硼同位素 水文地球化学过程 水热系统
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穹窿控制型地热流体质量评价 被引量:3
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作者 贾伍慧 刘凯 +6 位作者 张垚垚 张寿川 何庆成 孙军亮 余廷溪 郭骏瀚 王路瑶 《地球学报》 CAS CSCD 北大核心 2024年第1期80-90,共11页
地热流体是主要的地热资源之一。地热流体质量评价是地热流体开发利用的关键环节。本文利用地热水的现场测试和实验室全分析数据,对江西武功山穹窿区17处地热水进行了质量评价,主要包括理疗热矿水评价、饮用天然矿泉水评价、农业灌溉用... 地热流体是主要的地热资源之一。地热流体质量评价是地热流体开发利用的关键环节。本文利用地热水的现场测试和实验室全分析数据,对江西武功山穹窿区17处地热水进行了质量评价,主要包括理疗热矿水评价、饮用天然矿泉水评价、农业灌溉用水评价、渔业用水评价、腐蚀性及结垢趋势评价。评价结果显示,82%的地热水达到理疗热矿水标准,主要达标元素为氟和硅;18%的地热水达到天然矿泉水标准,达标成分为偏硅酸;化学组分适用于农业灌溉直接用水的地热水占82%,需经梯级利用后使尾水温度低于35℃;适用于渔业用水的地热水占76%;所有地热水均无腐蚀性和结垢趋势。以上结果可为该地区地热流体资源开发利用提供有效的参考价值。 展开更多
关键词 地热资源 地热流体 武功山 质量评价
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探究2023年2月6日土耳其7.8级双震的成因
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作者 郭贵娟 孙凤霞 杜建国 《地震》 CSCD 北大核心 2024年第3期1-20,共20页
为了促进地震预测和揭示地震成因奥秘,依据地壳结构、地震地质、地球物理、地热流体地球化学资料和地震序列发生的时空特征,综合研究了2023年2月6日土耳其南部7.8级双震的成因。2023年2月6-17日土耳其南部发生7.8级双震,伴随了几十次M≥... 为了促进地震预测和揭示地震成因奥秘,依据地壳结构、地震地质、地球物理、地热流体地球化学资料和地震序列发生的时空特征,综合研究了2023年2月6日土耳其南部7.8级双震的成因。2023年2月6-17日土耳其南部发生7.8级双震,伴随了几十次M≥5.0强余震和数千次M<5.0的余震。地震震源深度分布范围为5~22 km,在大约500 km×300 km的范围内震中分布形成一条NE向、宽约40 km、长约300 km和另一条近EW向、宽约50 km、长约240 km的震中分布密集带。研究区下存在地壳内的低速高导层,大地热流密度高值异常,布格重力负异常、航磁异常以及深大断裂带,表明该区岩石圈内存在地幔流体聚集、形成超高压流体的条件。地幔流体局部聚集形成超高压流体的过程可视为孕震过程。2023年2月6-17日不同时段的地震震源空间分布的阶段性集中和深度变化表明,地幔高能密流体的持续供给或者供给量增大形成了孕震体。当孕震体内流体压力大于围岩束缚强度(围岩抗压强度+静水压力)时发生流体隐爆,产生地震。流体通过运移-聚集-爆炸-运移-聚集-爆炸……的循环方式运移,同时产生7.8级双震及其余震。这从能量来源和产生地震波的角度较合理地解释了在有限的范围内非连续、非弹性地体中连续产生7.8级双震和M≥4.0余震的现象。 展开更多
关键词 7.8级双震 隐爆作用 地幔流体 地热流体孕震 地震成因 土耳其
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