During the production and storage of liquefied natural gas (LNG) in LNG plants, a large amount of Boil-off Gas (BOG) will be generated. BOG not only contains considerable cold energy, but also belongs to helium rich natural gas, which has great development and utilization value. Taking a LNG plant with an annual output of 200,000 tons in Ordos Basin as an example, this paper designs the process flow for BOG helium extraction and cold energy recovery and utilization based on the analysis of raw natural gas, purified natural gas, BOG components and treatment technology, and estimates the investment cost and economic benefits. The results show that the construction of BOG helium extraction and cold energy recovery unit in LNG plant has good profitability. The enterprise can achieve an annual average profit of 33,683,400 yuan from helium sales alone and an annual cold energy recovery of 1,182,800 kW·h, reducing the cost by 496,800 yuan based on electricity prices.

Ethylene plant, FCC unit and MTO plant produce a considerable amount of C4-C8 olefin fractions as byproducts. Utilizing these low value-added byproducts to produce ethylene/propylene through olefin catalytic cracking can increase the economic benefits of enterprises. The raw material C4-C8 olefin fractions generally contain impurities such as oxides, sulfur and H²O. Not many impurities are produced during catalytic cracking. In order to obtain polymer grade ethylene and propylene products, an adsorption system needs to be set up to remove the impurities entrained into the system by raw material. This article introduces the regeneration process of the adsorption system and the design calculation of related orifices.

Affected by raw materials and operating conditions, the catalyst replacement cycle of fixed bed residue hydrogenation unit is normally 1-2 years, which cannot match the maintenance cycle of 3-4 years for refineries. During the startup and shutdown of a single train residue hydrogenation unit for catalyst replacement, some gas-containing oils are sent to the tank farm, causing environmental pollution and safety risks. To solve this problem, the equipment selection, investment and energy consumption of two degassing processes were compared with each other based on simulation analysis, and some suggestions were put forward for the selection of process.

The 1Cr5Mo pipelines that have been locally thinned after years of operation in petrochemical units are repaired and replaced. Crack defects easily occur during the welding construction of new and old pipelines. In this article, the causes of crack defects are found out by analyzing the appearance characteristics of cracks, the weld hardness, the chemical composition of base metal and the phase composition of scale on the inner wall of pipelines, as well as the mechanism of weld cracks and the construction process.

EPC petrochemical project is a major national engineering construction project in the field of engineering construction. Progress control plays an important role in promoting the entire process of the construction and management of EPC petrochemical projects, and progress measurement is a method that directly reflects project progress. Based on the progress measurement process of a chemical plant in a domestic refinery and petrochemical integration project, this article briefly introduces the specific methods and ideas for progress measurement of an EPC petrochemical project. By detailing the project implementation process and clarifying the focus of progress measurement, some reference is provided for similar projects.

In response to the problems encountered during the engineering design and startup of styrene extraction unit, some targeted engineering solutions were proposed through research and analysis as well as comparison between similar units. These solutions has been verified through actual operation and has achieved the expected results, ensuring the stable and long-term operation of the unit.

With the increasing service life of oil and gas pipelines in China, a large number of maintenance and repair operations such as valve replacement, branch reconstruction, pipeline cutting and replacement are carried out every year. Taking into account the influence of many unfavorable factors such as landform and climate, the industry has put forward higher requirements for pipeline plugging operations. In view of the technical problems in pipeline plugging, the development status of plugging and repair technologies for oil and gas pipelines at home and abroad is introduced, and the construction process and characteristics of traditional plugging technologies for oil and gas pipelines and new intelligent internal plugging technology are analyzed. It is clear that intelligent internal plugging technology has better applicability for high-pressure oil and gas pipelines. The relevant theoretical results play a positive role in promoting the development of domestic safe pipeline plugging technologies.

In order to solve the problems including the difficult oil collection and dehydration in storage tanks and the off-spec water content of oil delivered from Dalaoba Gas Gathering Station, the oil collection process was optimized and heat tracing process was added for slop oil tank to achieve rapid oil collection without affecting the production in the station. Appropriate demulsification agent was selected through crude oil demulsification experiment, and the oil mixture was reprocessed in the reboiler of condensate oil stabilization tower through process re-optimization. The joint use of appropriate agent and high temperature demulsification technology can improve the demulsification and dehydration effect of the oil mixture, send stable condensate oil into storage tanks, and deliver condensate oils from the tanks in time, thus ensuring the stable operation of units in the station.

Vortex flowmeter sets a vortex generator in the fluid, alternately generates regular vortices from both sides of the vortex generator, and takes the relationship between the generation frequency of fluid vortex and the fluid velocity as the flow detection information. From the point of view of engineering design, this paper studies in detail the selection of nominal diameter, the selection of integrated or split type flowmeter, the installation precautions for flowmeter, the temperature and pressure compensation, and the accurate measurement methods during the selection and design of vortex flowmeter according to different medium phases including liquid, gas and saturated steam, and elaborates the structure characteristics, type selection and application range of flowmeter.

During the digital transformation of enterprises, cloud services play a crucial role. This article presents an Engineering Cloud Resource Management System designed based on the Citrix platform. The system achieves standardized online management of engineering cloud resources. It allows real-time monitoring of resource performance and delivery group load on the cloud platform, and automatically adjusts delivery group resources based on load trends while providing multidimensional analysis of users’ usage data to assist decision-making in the construction of engineering cloud platform. The system has been put into use in the production environment of the enterprise, improving the stability and resource utilization of cloud platform, continuously enhancing user experience, and reducing the time cost of administrators' operation and maintenance. It plays an increasingly important role in the intelligent operation and maintenance of cloud platform.

This paper takes the ethylene glycol monomethyl ether (EGME) regeneration tower (C0469) in the refining unit of a PO/MTBE plant as an example, and introduces the typical layout of packed tower and its related equipment such as reboilers, overhead condensers and bottom pumps. Combined with the typical characteristics of packed tower such as small tower diameter and high tower body, the nozzle orientation layout, framework platform layout and the layout of main pipelines of packed tower are studied, providing reference for the design of similar towers in the future.

Due to the particularity of medium and equipment, there are some unique requirements and precautions for the equipment layout and piping layout of polymerization unit in gas-phase polyethylene plant. Based on engineering practice, this paper discusses and summarizes the precautions for the layout design of circulating gas system, PDS system and catalyst system in the polymerization unit of gas-phase polyethylene plant.

This paper introduces new models for the furnace structure and the layout of piping in front of the cracking furnace in an ethylene plant. Combined with the design experience and practical examples of the furnace tubes of a 200 kt/a furnace in an ethylene plant in China, this paper elaborates on the design process for platform arrangement and the redistribution of valve group placement from a structural and functional perspective. An innovative scheme is presented for the piping design of cracking gas valve and the span of pipe gallery, and the feasibility of this scheme is demonstrated from the perspective of stress analysis. Additionally, it explores the potential to reduce the footprint of the entire cracking furnace by reducing the span of pipe gallery from the perspective of spatial layout.

Combined with actual project experience, this paper discusses the practice process of plant-wide digital delivery, including the formulation of technical plans, the management of implementation process and the final implementation. This paper discusses the problems found in the overall management of plant-wide digital delivery projects and the solutions, so as to provide experience and suggestions for further improving the completion quality and efficiency of digital delivery projects in the future and explore a better practice path for the subsequent construction of intelligent plant.