Wind and solar powerhydrogen production is an important meansto achieve thedual-carbon goals and promote the substitution of green hydrogen for gray hydrogen. However,the high volatility of wind and solar resources leadstothe difficulty in matching hydrogen production withhydrogen consumption. Therefore, it is urgent to develop hydrogen storage,transportationand peaking technologies for suppressingthe fluctuations. This article proposes various design schemes of storage, transportation and peaking system forlarge-scale greenpower hydrogen production projects, and simulatesthe real operation and scheduling conditions based onthe output curve of wind and solar power in project sites.The design schemes are analyzed from the aspects of energy consumption of system, fatigue condition of vessels and overall economic efficiency. The research results indicate that the "replenishment tank" process,whichmatches the tank pressure withthe upstream hydrogen production pressure,has the best overall performance.The methods and conclusions of the research provide theoretical basis for the design of green power hydrogen production projects.

At present, pipeline insulation data is still collected manually, with low detection efficiency and expensive detection costs. In addition, refining enterprises lack effective online monitoring measures for pipeline insulation, which makes it difficult to grasp the real-time operation status of pipeline insulation andtimely detect abnormal situations such as leaks. Relying on manual inspection has limitations. On the basis of fiber optic temperature measurement technology, an intelligent data acquisition system framework for pipeline insulationwasbuilt combined with computer technology and sensor technology,integrating on-site acquisition control, data Internet transmission and remote monitoring.The design and development of software and hardware for a lower computer monitoring system, a web-based intelligent data acquisition system for pipeline insulation and a data acquisition host was completed, and some data acquisition experimentswere conducted using a pipeline insulation testing device. The results showed that real-timedata acquisitioncan be achieved for pipeline insulation, and the temperature measurement error is within 1℃.Functions such as on-sitedata acquisitionand control, remote online monitoring of temperature and heat dissipation losses, positive balance calculation, digital pipeline diagram viewing, historical data query and abnormal alarm can beachieved.

Cracking C₆fraction is a by-product of naphtha steam crackingforethylene production. Through benzene extraction,the by-product C₆ raffinate oil hasa highcontent of n-hexane. At present, this part of C₆raffinate oil is mainly sold directly as crude hexane products or used directly for downstream gasoline blending,without enhancing its added value. The practical application shows that after removing a small amount of benzene from the C₆ raffinate oil through hydrogenation reaction, high purity n-hexane can be obtained by distillation, thus greatly improvingthe utilization value ofthe raffinateoil.

This paper introduces the main parameters and difficultiesin the research of NPS24 Class 900 high pressure large diameter bidirectional seal program-controlled risingstem ball valve.Tosolve the problems in traditional rising stem ball valvesuch as the inability to meet bidirectional sealing requirements,the lower support shaft strain, andthe difficulty in valve seat maintenance, the designofvalve structureis optimized.In order to ensure the integrity of the pressure boundary, ASME B16.34 and finite element methodare used to calculate and analyze the strength of valve body and valve cover. The results show that the structure of the valve body and valve coveris safe. The calculation of torsion angle and torsional stiffness at the spiral track groove of valve stem shows that the strength of the valve stem is safe. By optimizing the casting process of LC1 material, the low-temperature impact toughness of LC1 materialissignificantly improved,meeting thespecial requirement of -52 ℃ low-temperature impact value ≥ 27J.The valve stem processing technologyis optimized to meet the frequent action requirement of 750 times per year. The sealing surface of high pressure large diameter sphere is sprayed using flame spraying melting technology, and the coating and substrate are metallurgical structures, effectively improving the wear resistance and erosion resistance of the high pressure large diameter sphere.The results of the bidirectional high pressure liquid sealing test, bidirectional high pressure gas sealing test and bidirectional low pressure gas sealing test of the valve all meet the requirements of GOST 9544 Class A.During the no-load operation test and maximum closing differential pressure operation test of the valve, the valve opens and closes smoothly without any jamming, sticking, crawling or shaking. Thecomprehensive performance test results indicate that the localization development is successful.

 Extrusionand pelletizing workshop is one of theimportantbuildingsin polypropylene plant and should be paid more attention in design and construction. The detailsofits structure design not only reflects the engineers’ intentions, but also improves thesafetyof the structure.Based on engineeringexamples, thestructure design of extrusionand pelletizing workshopsin polypropylene plantsare discussedfrom theaspectsof designdifficulty,design details and structural calculation, so as to highlight the control of design details,thuseffectively improvingdesign quality and makingthe usersmore comfortable.

3D design softwarefor petrochemical plants is a pivotal tool in industry sectors includingrefining and petrochemical, chemical engineering and pharmaceuticals. It facilitates the visualization ofplantlayout design through 3D modeling of internal components such as equipment, pipelines and valves. During the detailed design of petrochemical plants, the assembly and layout design of oil and gas pipelines is particularly critical, as it directly impacts the quality and efficiency ofplant design. This paper provides an in-depth analysis and summary of the data models, graphical representations and business functionalitiesof mainstream domestic and international 3D design software for petrochemical plants in the design ofoil and gas pipelines, compares the technical approaches,advantages and disadvantages of different software, discusses their evolutionary history and development trends, and explores the application scenarios and development practices for oil and gas pipeline models,aimingto offer references and insights for the application,research and development of3D design software for petrochemical plants in relevant fields.

This paper introduces the application of a primary plus secondary local postweld heat treatment method and induction heat treatment technology in threaded ring lock heat exchangers. The method solves the problem of local postweld heat treatment with traditional ways for this type of heat exchanger, and also provides solutions for other large over-limit equipment as a new local postweld heat treatment method.

Emergencypressure reliefsystem isthe primary means of protecting units, and the accurate calculation ofits relief rate is very important forproduction safety and flare system design. Takingthe pressure relief of LPG separation system in fire case as an example,a modelwas establishedvia HYSYS BLOWDOWN Analysis Tool,andthe orifice diameter wasadjusted to meet the pressure reliefrate. This paper introducesthecalculation characteristics and limitations of BLOWDOWN Analysis Tool,and analyzesthe variationsofparameters such as pressure, temperature andpressure relief rate duringpressure relief.After optimizingthepressure relief system usinga multi-orifice model, the peak flow canbe reduced by18.5%.

 With the rapid development of information technology, big data analysis has become increasingly important in several fields, and the performance of database optimizer algorithm directly affects the speed and quality of the analysis, so the purpose of this paper is to explore how to optimize the database optimizer algorithm to improve the efficiency and accuracy of big data analysis. The research methodology uses tools such as Python, PostgreSQL and cuBLAS to complete the optimization of the database optimizer algorithm, builds the optimization environment on a high-performance server, and verifies the feasibility of the optimization algorithm. The results show that using the above tools allows the optimization algorithm to show better performance in processing large-scale and high-dimensional datasets and maintains efficient operation under different data characteristics, proving its usefulness and effectiveness in big data analysis.

This paper introduces the vibration problem of high-pressure centrifugal water injection pumps in a residue hydrogenation unit and the treatment process, and compares two types of centrifugal water injection pumps from many aspects. Finite element analysis software is used for simulation analysis particularly in terms of wet rotor dynamics and hydraulics, and a corresponding improvement plan is put forward according to the analysis results, fundamentally solving the vibration problem of water injection pumps during actual operation and improving the reliability of high pressure centrifugal pumps during long period operation.

Reinforced concrete frame foundation for tower-type equipment belongs to hybrid structures. With the rapid development of the petrochemical industry, tower type equipment is becoming taller, larger and heavier. Therefore, the stiffness of the equipment has a greater impact on the period of reinforced concrete frame foundations. Referring to existing engineering experience, three calculation models using PKPM software were used to compare and analyze the period of reinforced concrete frame foundation for tower-type equipment. The results showed that the period was different when the simulation method of the tower was different.

 In this article, the equipment layout and pipingdesign of CO? removalunitin ethylene oxide/ethylene glycol (EO/EG) plant are studied. Based on the analysis of process flow and operation requirements,the optimalequipment layout and piping design ofCO? removal towersystemare discussed in accordance with relevant standards, and thecharacteristicsand matters needing attention in thepiping design of CO?removal unit inEO/EG plantareanalyzed,providingtechnical support for the efficient and stable operation of theplant.

 In transactional practices such as goods trade and construction projects, “back-to-back clauses”isa common payment arrangement in relevant contracts. Under the transactional framework shaped by such clauses, parties to the contract agree that one party’s payment obligation to the other is contingent upon receiving payment from a third party. Whether to alleviate financial pressures, transfer the risks associated with third-party payment, or secure scarce business opportunities, theseclauseshavebeen widely adopted in various industries. However, the specific nature and actual enforceability of such clauses remain subjects of divergent opinions in judicial practice. The issuance of the new judicial interpretation provides an opportunity to further clarify the enforceability of these clauses, thereby facilitating the substantive resolution of disputes. This article, from the perspective of the new judicial interpretation, integrates judicial practices to conduct a multidimensional analysis of “back-to-back clauses” and explores their practical implications.

Global energy is entering into a period of structural adjustment. As the production capacity of China's traditional refining and petrochemical industry is gradually reaching its peak, Chinese refining and petrochemical engineering companies are accelerating their pace of "going global", and the international market provides a huge stage for them. Compared with world-class engineering companies, Chinese refining and petrochemical engineering companies have unique advantages and disadvantages. They should continuously enhance competitiveness, strengthen strategic planning of overseas market, consolidate the foundation of risk control, strengthen personnel training, accelerate the establishment of localized low-cost centers, promote engineering services to high-end and front-end, create a unique advantage of "International Rules + Chinese Efficiency", expand their diversified business areas, and continuously enhance their international operation capabilities.