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Safety Management of Work at Height in Offshore Engineering Manufacturing Industry LUO Mengran, WANG Qinggong, YU Minggan Ocean Engineering Equipment and Technology    2025, 12 (3): 79-86.   DOI: 10.12087/oeet.2095-7297.2025.03.10 Abstract （699）      PDF（pc） （9952KB）（263）       Knowledge map    Save Due to the specific manufacturing processes in offshore engineering， work at height is highly prevalent， particularly during the assembly phases of large structures such as modules and jackets， where the frequency of work at height and multi-level crossover operations， as well as the potential fall height， are continuously increasing. This paper provides a classified review of current domestic and international research on work-at-height safety. It systematically examines the definition and identification criteria of work at height and proposes comprehensive preventive measures based on domestic and international regulatory standards and engineering practices. These measures encompass multiple aspects， including engineering technology， management， personnel， and physical protection. To ensure the inherent safety of scaffolding， the paper discusses different types of scaffolding and their selection during construction， aiming to provide a safety management framework for work at height in the offshore engineering manufacturing industry. This framework is designed to effectively reduce accident rates and ensure operational safety. Related Articles | Metrics | Comments（0）

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Research on the Identification of Technological Opportunities in Marine New Materials in China LIU Hongyu, WU Dajian Ocean Engineering Equipment and Technology    2025, 12 (3): 123-127.   DOI: 10.12087/oeet.2095-7297.2025.03.16 Abstract （494）      PDF（pc） （4127KB）（245）       Knowledge map    Save This study explores technological opportunities in China's marine new materials field based on patent mining. Patent data were analyzed across trends， authorization， regions， and lifecycle， and keyword clustering was used to identify hotspots. Results show the field is transitioning from growth to maturity， focusing on composites， molding， and green materials， with future directions in intelligent and multifunctional systems. Strategic suggestions are proposed to guide innovation and planning. Related Articles | Metrics | Comments（0）

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Latest Progress and Perspective in Analysis Technologies of Floatover Installation System QIN Licheng, LIANG Xuexian, FANG Xukai, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 83-95.   DOI: 10.12087/oeet.2095-7297.2025.04.12 Abstract （378）      PDF（pc） （8149KB）（365）       Knowledge map    Save With the rapid development of offshore engineering technology， offshore platforms are developing towards large-scale and integrated， which also puts forward higher requirements for offshore installation technology， and floatover installation technology also comes into being under this background. It is of great significance for the design and implementation of offshore platform installation to carry out sufficient research on the floatover system. This paper introduces the numerical and experimental modeling and analysis of the floatover system， including the hydrodynamic analysis， the modeling of the load buffer device， and the research of the nonstationary nonlinear multi-body system. Some views on future development trends are also provided. Related Articles | Metrics | Comments（0）

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Economic Analysis of Green Hydrogen and Its Derivatives Production Technology Based on Offshore Wind Power SHEN Qi, LIU Chao, LI Ouping, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 94-101.   DOI: 10.12087/oeet.2095-7297.2025.03.12 Abstract （371）      PDF（pc） （3148KB）（254）       Knowledge map    Save As the global energy structure transforms and the “dual-carbon” goals are set， green hydrogen is gaining importance as a clean energy source in the petroleum refining industry. This study comprehensively assesses the technical and economic viability of producing green hydrogen， methanol， and ammonia using offshore wind power. By calculating the costs of hydrogen production， methanol synthesis， and ammonia synthesis under varying electricity costs， the study analyzes how electricity prices affect the economic viability of green hydrogen and its derivatives. The results indicate that when the electricity cost is 0.35 yuan per unit， the current alkaline electrolysis hydrogen production technology yields a hydrogen cost of 24.66 yuan/kg in the scenario of offshore wind power and onshore hydrogen production， with methanol and ammonia production costs of 5457.55 yuan/ton and 4999.43 yuan/ton， respectively. The study emphasizes that electricity cost is the key factor influencing economic viability. Reducing renewable energy electricity costs and enhancing electrolysis efficiency are crucial for boosting the competitiveness of green hydrogen and its derivatives. Finally， the article proposes suggestions for the coordinated development of policies， technologies， and industries to promote the industrialization of green hydrogen and its derivatives. Related Articles | Metrics | Comments（0）

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Design and Fabrication of a Compact Brushed Electromagnetic Catapult Based on Halbach Array ZHANG Shutian, GUO Sixing, LI Jiaqiang, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 22-29.   DOI: 10.12087/oeet.2095-7297.2025.03.03 Abstract （361）      PDF（pc） （7220KB）（282）       Knowledge map    Save A compact brushed electromagnetic catapult was designed and fabricated， with focused analysis on its operational principle， structural design， and performance parameters. By investigating the electromagnetic driving characteristics of the catapult system， the key factors influencing launch efficiency are explored. Additionally， the advantages of the system in high-precision control and energy conversion efficiency are experimentally validated. The results demonstrate that the proposed electromagnetic catapult exhibits rapid response speed， high reliability， and ease of maintenance. This work provides a reference for the miniaturized design of future electromagnetic catapult systems. Related Articles | Metrics | Comments（0）

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Mapping the Research Frontiers of Global Marine Engineering (2015-2024): A Journal-Based Knowledge Graph Approach PAN Fei, WANG Xiaolong, CAI Yunze, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 132-144.   DOI: 10.12087/oeet.2095-7297.2025.03.18 Abstract （325）      PDF（pc） （3336KB）（592）       Knowledge map    Save Ocean engineering serves as a cornerstone for maritime power strategies and global sustainable development. To systematically reveal the research landscape, innovation entities, and frontier evolution in global ocean engineering, this study conducts an in-depth analysis of 37889 publications from 2015 to 2024 based on the Web of Science Core Collection, employing bibliometric methods and knowledge graph analysis. The findings demonstrate: ① A fundamental shift in the global research center of gravity has occurred, with China emerging as the world's primary innovation contributor across key indicators including publication volume and citation impact—its annual publication share surged from 20.9% in 2015 to 60.1% in 2024; ② Innovation entities exhibit highly clustered characteristics, with leading Chinese universities such as Harbin Engineering University and Shanghai Jiao Tong University monopolizing the top 10 global institutional rankings, forming world-class “academic highlands”; ③ Through keyword co-occurrence and cluster analysis, seven frontier themes were identified, including marine renewable energy development, intelligent autonomous marine systems, highfidelity multi-physics simulation, and marine environmental sensing and data science, revealing that the field is being profoundly reshaped by trends of “intelligentization” “decarbonization” and “high-fidelity modeling”; ④ The journal influence landscape has been restructured, with the Chinese-hosted Journal of Ocean Engineering and Science achieving the highest impact factor (11.8) in the field, though platforms for global dissemination of top-tier research require further expansion. Finally, this study establishes a framework for modern ocean engineering frontiers centered on “sustainable & intelligent ocean engineering” supported by “three foundational pillars” and driven by “four enabling engines”. The research reveals China's historic transition from “follower” to “leader” in ocean engineering, provides researchers with a clear developmental roadmap, and profoundly elucidates the strategic urgency of building world-class scientific journals to secure academic discourse power and enhance national scientific soft power. Related Articles | Metrics | Comments（0）

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Exhibition of Modern Model Making Technology Based on the Model Making of 093 Nuclear Submarine SHOU Hai, TIAN Yutao, ZHANG Shutian, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 11-21.   DOI: 10.12087/oeet.2095-7297.2025.03.02 Abstract （316）      PDF（pc） （6851KB）（260）       Knowledge map    Save Taking the 093 model production as a starting point, this paper conducts an in-depth analysis of modern model making technologies. Through a detailed elaboration of the production process of 093 nuclear submarine model， including precise digital design using 3D modeling software in the early stage to determine the accurate proportion， suitable size and select appropriate materials， the use of 3D printing technology for rapid prototyping and fine model manufacturing， and the later processing procedures such as surface cleaning， polishing and coating protection， the characteristics and advantages of modern model-making techniques in digitalization， automation， material application and fine processing are comprehensively demonstrated. At the same time， the key role of this technology in improving the efficiency of model production， enhancing the reducibility and precision of models， as well as its application prospects and development trends in the field of model making are discussed， providing a useful reference for in-depth understanding of modern model-making techniques. Related Articles | Metrics | Comments（0）

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Key Nodes in the System Commissioning of Offshore Oil Platforms ZHANG Chun Ocean Engineering Equipment and Technology    2025, 12 (4): 96-103.   DOI: 10.12087/oeet.2095-7297.2025.04.13 Abstract （303）      PDF（pc） （2452KB）（202）       Knowledge map    Save The commissioning of an offshore oil and gas production platform system is a critical task preceding mechanical completion of both onshore fabrication and offshore installation. The thoroughness and outcomes of the commissioning work will have a direct impact on the safe operation of the oil and gas fields. This article primarily addresses the preparatory work and overarching principles prior to system commissioning， alongside the key tasks that require focused attention during the commissioning phase. The primary framework encompasses platform power transmission and reception， crude oil generator commissioning， EMS (emergency management system) commissioning， central control logic testing， and the commissioning of water circulation and other utility systems. These cover areas such as power， process， utilities， and instrumentation controls. It provides a detailed elaboration on the pre-commissioning activities pertinent to conventional offshore oil and gas production platforms， the main elements of the commissioning process， and the objective of employing commissioning to promote construction progress and quality， thereby ensuring the seamless completion of the commissioning work. Related Articles | Metrics | Comments（0）

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Discussion on Regular Inspection Technologies for Submarine Pipelines SU Tianshui, LIAO Hengjie, HUANG Panyang Ocean Engineering Equipment and Technology    2025, 12 (3): 118-122.   DOI: 10.12087/oeet.2095-7297.2025.03.15 Abstract （287）      PDF（pc） （5619KB）（291）       Knowledge map    Save Subsea pipelines are critical infrastructure for transporting offshore oil， gas， and other resources， and their safety is vital to the marine economy and environment. This paper provides an overview of the construction and inspection status of subsea pipelines along the coast of Zhejiang Province， with a focus on external pipeline inspection technologies and methods. Taking the key area of Huibieyang in Zhejiang as an example， it analyzes and highlights that pipeline inspection should be tailored to different marine environments. Related Articles | Metrics | Comments（0）

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Research on Installation Technology of Composite Cables for Newly Constructed Deepwater Jackets WANG Minfeng, WEI Xumin, XU Long, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 51-57.   DOI: 10.12087/oeet.2095-7297.2025.03.06 Abstract （286）      PDF（pc） （11076KB）（264）       Knowledge map    Save Offshore pile foundation fixed oil platforms are the main structural form of offshore oil production in China. At present， the tension type external current cathodic protection technology has become the main technical means of cathodic protection for offshore pile foundation fixed jacket platforms. The newly built jacket platform adopts the method of installing a tensioned composite cable electrode system on land， but facing the design height of 338 meters of jacket， it is a huge challenge to install a composite cable about 340 meters long and weighing about 3.5 tons during its horizontal construction process， and there are no relevant research results or industry experience to draw on. In order to solve this problem， this article proposes a static sliding cable composite cable installation method for installation testing. Based on mechanical calculations and 3D simulation， video monitoring， and dynamic monitoring of the actual process of the composite cable， the actual monitoring data is comprehensively compared with theoretical calculation data and onsite test data. The focus is on studying the stress state of the steel wire rope sliding cable and traction steel wire rope during the installation process of the composite cable， the local deflection and overall deflection of the composite cable， and the change law of the composite cable motion posture during the installation process， to verify the feasibility of the impressed current cathodic protection （ICCP） composite cable sliding cable installation scheme for deepwater horizontal jackets. Related Articles | Metrics | Comments（0）

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Naval Battle Model Production: A Conceptual Naval Battle Model Based on Aircraft Carrier Formations GUO Sixing, SHOU Hai, CHEN Zehan, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 10-17.   DOI: 10.12087/oeet.2095-7297.2025.04.02 Abstract （284）      PDF（pc） （5239KB）（206）       Knowledge map    Save Against the backdrop of the evolving international situation and the continuous enhancement of naval combat capabilities, this project takes hypothetical future naval battles as a blueprint to design, fabricate, and demonstrate a scaled-down model of a partial naval battle scenario. This paper aims to demonstrate China's growing naval equipment capabilities and its future combat processes by creating scaled-down partial naval battle models and supporting wargames. This initiative is designed to popularize knowledge about the combat processes of aircraft carrier battle groups among students and strengthen patriotic education. Related Articles | Metrics | Comments（0）

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Structural Design of an Offshore Floating Base under a Modular Concept ZHANG Shutian, CHEN Zehan, TIAN Yutao, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 18-31.   DOI: 10.12087/oeet.2095-7297.2025.04.03 Abstract （281）      PDF（pc） （6327KB）（243）       Knowledge map    Save To address the issues—high construction costs, limited flexibility, and difficulty in meeting the maintenance demands of large naval vessels such as aircraft carriers—associated with traditional ultra-large floating docks, this paper proposes a modular, self-propelled, multi-functional offshore floating-base structure based on the concept of very large floating structures (VLFS). This platform consists of multiple small floating dock modules, each equipped with its own lifting, self-propulsion and dynamic-positioning systems. These modules can be flexibly combined according to mission requirements to form an ultra-large floating operation platform with comprehensive support capabilities. This paper elaborates on its overall architecture, buoyancy design, power configuration, ship guidance system, and structural connection scheme. Furthermore, its structural safety and operational feasibility are validated by means of hydroelastic-response analysis and transverse-strength assessment. This design provides an important reference for the future engineering implementation and educational application of mobile offshore bases. Related Articles | Metrics | Comments（0）

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Introduction to Military Model Making: Taking the Type 05 Amphibious Armored Assault Vehicle as an Example GUO Sixing, LI Yuting, LI Jiaqiang, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 1-9.   DOI: 10.12087/oeet.2095-7297.2025.04.01 Abstract （281）      PDF（pc） （4871KB）（217）       Knowledge map    Save By documenting the entire process of building a scale model of the 05 amphibious assault vehicle—from information gathering and 3D modeling to final fabrication—this project illustrates the distinctive value of military modeling in naval and military-engineering education. It seeks to spark students' interest in ocean engineering and, ultimately, to cultivate the interdisciplinary talent required by China's national strategy of strengthening the country through human capital development. The work also serves as an important popularscience resource for military engineering education. Related Articles | Metrics | Comments（0）

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APS Migration Studies in Large Marine Structures LI Wenwu, LIU Xiuhong, QIAN Peng, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 73-78.   DOI: 10.12087/oeet.2095-7297.2025.03.09 Abstract （274）      PDF（pc） （8709KB）（236）       Knowledge map    Save To address the bottleneck issues of high skidway resource occupancy and poor project scheduling flexibility in traditional skidway traction methods for 10000-ton-class deepwater oil and gas platform modules， this study introduces the mature skidway-free air pad sliding （APS） transportation technology from the shipbuilding industry. Based on application practices in South Korean shipyards， a technical solution integrating air-cushion suspension and hydraulic propulsion systems was systematically developed. By incorporating multi-stage hydraulic jacking devices and path control systems， millimeter-level precision transportation of modules weighing up to 30000 tons was achieved. Engineering validation demonstrated that the APS system reduced skidway resource requirements by 100%， improved project scheduling flexibility by 60%， and shortened transportation cycles by 40%. This research represents the first successful adaptation of APS technology to the offshore engineering sector， establishing a comprehensive skidway-free construction and transportation methodology. The findings provide an innovative solution for China's deepwater oil and gas equipment construction， effectively overcoming the rigid dependence on skidway resources for ultra-large structure transportation. Related Articles | Metrics | Comments（0）

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Study on Oil Flushing Process and Method Optimization WANG Ziyang, WANG Xiaohua, GUO Chongxiao, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 104-115.   DOI: 10.12087/oeet.2095-7297.2025.04.14 Abstract （255）      PDF（pc） （4786KB）（182）       Knowledge map    Save In the offshore engineering construction， the cleanliness of equipment and instrumentation pipelines plays a vital role in the safe and long-lasting operation of production platforms. Oil flushing as an efficient pipeline cleaning method， the existing studies have focused on analyzing the oil-flushing process itself， while paying little attention to improving flushing efficiency or optimizing the methodology. In this manuscript， the oil flushing equipment， construction process， factors affecting oil flushing efficiency are studied. Then the characteristics of series and parallel flushing methods are compared. Finally， an oil flushing device that can be used in multiple parallel flushing is proposed， and numerical simulation of the oil flow characteristics in the device is carried out based on ANSYS Fluent. According to the results of the simulation， three optimized forms of single column structure， symmetric structure and staggered structure are proposed， and the flow distribution characteristics of the three optimized structures are compared with those of the original structure. The research results show that the flow distribution consistency of the oil in the form of symmetric structure is the highest， and its four branch flow basically meets the flow requirement of 43.73L/min， which can realize multiple parallel flushing. Related Articles | Metrics | Comments（0）

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Mechanical Characteristics of Deepwater Riserless Mud Return Line Under Internal Flow Induced Excitation YIN Zhiming, LI Zhong, WU Di, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 39-50.   DOI: 10.12087/oeet.2095-7297.2025.03.05 Abstract （253）      PDF（pc） （7734KB）（260）       Knowledge map    Save The mud return line is the key equipment of deepwater riserless drilling system. It is filled with high flow velocity mud， and the mechanical characteristics of mud on the line are not clear. The mechanical model of the mud return line under the combined action of internal and external flow was established by using the microelement method， considering the internal flow inertia force， friction force， centrifugal force and Coriolis force. The numerical model was established by using the finite element method， and the solver developed by Newmark-β method and MATLAB. The single effect and the combined effect of the internal flow force are analyzed， and the influence of mud flow rate， mud density and other factors on the internal flow mechanical characteristics is also studied. The result shows that the inertia force increases the vibration amplitude of the return line， riction decreases the lateral displacement of the return line， centrifugal force and Coriolis force increase the lateral displacement of the return line. The internal flow force has great influence on the return line， and the friction force has the greatest influence on the mud return line. The effects of inertia force， Coriolis force and centrifugal force are small. The effect of internal mud on the return line should be considered in the actual engineering analysis. Related Articles | Metrics | Comments（0）

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Experimental Study on the Dynamic Response Characteristics of Buoys in Floating Wind Turbine Mooring Systems under Current Loads LI Xiaoyong, ZHANG Hang, JI Weidong, et al Ocean Engineering Equipment and Technology    2025, 12 (4): 49-54.   DOI: 10.12087/oeet.2095-7297.2025.04.07 Abstract （252）      PDF（pc） （3766KB）（196）       Knowledge map    Save The mooring system of floating offshore wind power structures is a key component ensuring their long-term stable operation. In recent years， to enhance mooring performance and reduce construction and maintenance costs， optimized mooring system designs incorporating auxiliary buoys have attracted widespread attention. Based on a comprehensive review of related studies both domestically and internationally， this paper focuses on the dynamic response characteristics of buoys under ocean current effects. A series of current-induced load experiments were conducted in a circulating water channel using a 1∶25 scale buoy model. The pitch angle of the buoy and the mooring line tension were measured under different current velocities， and the variation law of the current load coefficient with current velocity was analyzed. The experimental results indicate that the buoy exhibits significant current-induced vibrations at high current speeds. The mooring tension shows a continuous increase in the horizontal direction， while in the vertical direction， the tension demonstrates non-monotonic variation due to vibration effects. The obtained dimensionless current load coefficient ranges from 1.056 to 1.538. These results provide essential parameters for the design of buoys in floating wind turbine mooring systems， thereby improving their safety and cost-effectiveness. Related Articles | Metrics | Comments（0）

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Design of Optical Fiber Communication System for Subsea Production System Based on Ring Topology ZHANG Yan, SUN Qin Ocean Engineering Equipment and Technology    2025, 12 (3): 67-72.   DOI: 10.12087/oeet.2095-7297.2025.03.08 Abstract （247）      PDF（pc） （3580KB）（237）       Knowledge map    Save An optical fiber communication system based on ring topology is proposed for the development of subsea oil and gas fields reconnecting to the existing facilities with limited resources reserved fiber cores， which is based on the efficient utilization rate of optical fiber resources and the superior scalability of topology based on ring topology， and only 4-core fibers are needed for a single loop， which can effectively solve the problem of limited optical fiber resources， and the system has superior expansion ability. Then， the scheme design of the system is carried out， and the standards and methods of the communication verification and practical application case are given， Finally， based on the characteristics of different projects of the subsea production system， the applicability of the star topology and the ring topology is analyzed， which provides a reference for the communication scheme design of the subsea production system. Related Articles | Metrics | Comments（0）

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Design of Ship Model Resistance Experiment Platform SHI Kunpeng, ZHENG Yuxing, TIAN Yutao, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 1-10.   DOI: 10.12087/oeet.2095-7297.2025.03.01 Abstract （247）      PDF（pc） （3698KB）（293）       Knowledge map    Save The study of hull resistance is of great significance to the dynamic characteristics of the hull. Currently， there are more than ten large and small towing tank experimental platforms in China. For undergraduate students majoring in marine engineering， studying the resistance characteristics of the hull is of great importance to their professional knowledge learning. However， the construction cost of towing tanks is too high and cannot provide a good platform for undergraduate students to use. An easy-to-implement experimentalplatform construction plan， covering modelship building, platform design and resistance-accuracy verification， offers valuable learning and experimental experience for undergraduates. Related Articles | Metrics | Comments（0）

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Study on RSV Ethane Liquefaction Process for Preventing CO2 Freezing and Plugging SU Tianshui, SHEN Peng, JI Aoqi, et al Ocean Engineering Equipment and Technology    2025, 12 (3): 112-117.   DOI: 10.12087/oeet.2095-7297.2025.03.14 Abstract （247）      PDF（pc） （4249KB）（235）       Knowledge map    Save A natural gas processing plant with a capacity of 6×106m3/d plans to adopt the recycle split-vapor （RSV） process to recover liquefied ethane. CO2 freezing and plugging in the demethane tower is a key technical bottleneck affecting the stable operation. With the goal of improving the ethane yield， according to the selection of liquefied ethane process for natural gas production and the formation mechanism of CO2 freeze blockage， the CO2 distribution and temperature of each tower plate of each tower plate under different CO2 contents were simulated. Through the simulation curve comparison analysis， the conclusion was concluded that when the CO2 content of the raw gas in the cold box was less than 5×10-5， the demethanizer would not freeze blockage. According to the analysis of different decarbonization processes， the alcohol amine method is selected to remove CO2 to meet the process requirements. The research results show that by using PZ+MDEA solution to remove CO2 from raw natural gas， the problem of freezing and blocking of CO2 in the deep cold zone between -90℃ and -105℃ can be effectively solved， and the ethane yield can reach more than 95%. Related Articles | Metrics | Comments（0）