Automation in Petro-Chemical Industry

Discussion on the Key Problems of Long-distance Pipelines Design Standards between China, America and Russia

2020, 56(2): 0-0.

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Central Asia, China-Myanmar and China-Russia pipelines have become an important energy strategic channel in China. In order to improve the scientificity of pipeline design and safeguard the interests of China, it was necessary to study the differences in pipeline process design between China standard, American standard and Russian standard. The important technical differences between domestic and foreign standards, including pipeline steel, location class, design factors, wall thickness calculation and pressure test, were studied.The conclusion was that China standard of pipe selection was stricter than American standard, only PLS2 grade pipe was selected, and Russian standard pays attention to the tensile strength of pipe. China standard and American standard divide location class according to the number of households along the pipeline. The Russian Standard divides location class according to the type, location of the pipeline section and the risk level of the transmission medium. The design coefficients of location Class 1 division 1 of GB are 0.8 or 0.72, and those of location Class 1 division 1 of US Standard are 0.8, which are not identical with those of pipeline working factors in Russian standard. China standard and American standard calculate the wall thickness according to the yield strength of pipeline, Russian standard calculate the wall thickness according to the tensile strength of pipeline; The calculated wall thickness of Russian standard was higher than that of China standard and American standard.The Russian standard was stricter in pressure test medium and duration time. There was a gap between China standard and American standard and Russian standard in high strength hydraulic test. The research results can provide reference and guidance for the design and acceptance of new overseas pipelines in China.

Analyze and Discuss on Design Key Points of Light Crude Oil Trade Metering System for Offshore Oil Field

2020, 56(2): 0-0.

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It is taken as an design example that the trade metering system which is on FPSO in certain oil field in south China sea, the design example is used to analyze and discuss the design key points of light crude oil trade metering system for offshore oil field, including: selection of flowmeter, choice of metering pipe size and type of sampling system and etc, at last, the related design idea and recommendation are summarized, in order to provide reference for other similar engineering design in future.

Application of Fire-safe Valve in Ammonia Plant

2020, 56(2): 0-0.

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Most of the raw materials, fuels, process products and products used in ammonia plant are Class A and Class B fire hazards, among which there are toxic substances, and the operation conditions are generally carried out at high temperature and high pressure. In chemical and petroleum automation systems, once a fire occurs, if some equipment in the design can cut off the spread of the fire source immediately, then the heavy loss of the plant area can be avoided. As an important part of automation system, valve is not only used to open and close the pipeline, control the flow direction, adjust and control the parameters(temperature, pressure and flow rate) of conveying medium, but also can cut off the flow path in time and avoid the flow of combustible fluid to the main equipment when it occurs fire. Therefore, the fire resistance of the valve should be considered as an important performance, which can attract the attention of the relevant personnel.

Introduction to Instrument Signal Cable Selection Standards

2020, 56(2): 0-0.

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In EPC general contract project, many differences exist between National and International instrument signal cable section standards. For international project cable selection, the main design basis are European standard EN 50288-7 <<Multi-element metallic cables used in analogue and digital communication and control. Part 7：Sectional specification for instrumentation and control cables>> and American Standard UL 2250<<UL Standard for Safety Instrumentation Tray Cable>> etc. By Comparing National and International standards, the cable conduct, insulation, shield, armor, jacket requirements are introduced in detail.

Design of Safety Instrumented system for the Heating Furnace of Atmospheric and Vacuum Distillation Unit

2020, 56(2): 0-0.

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Heating furnace is the device to provide heat quantities for atmospheric and Vacuum Distillation Unit, and it is also the key device for safe production. For Preventing and lowering the process risk, safety instrumented functions of the heating furnace subsystem are analyzed detailed. Taking the SIL level of safety instrument function of atmospheric furnace of a refinery as an example, according to IEC 61508, ISA-TR84.00.02 calculation method and relevant regulations, the setting scheme of instrument, control valve and logic controller to realize the safety instrument function of heating furnace is introduced in detail.

Optimal Control Simulation of CSTR Process Based on EMPC

2020, 56(2): 0-0.

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CSTR is widely used in chemical, fuel, pharmaceutical and other processes. Due to its complex mechanism, multivariable coupling and strong nonlinearity, traditional control of CSTR is difficult to achieve ideal results. This paper presents an application of Economic Model Predictive Control (EMPC) to a class of CSTR. As a kind of nonlinear MPC, mechanism models are employed to predict and optimize. The control strategy minimizes the economic objective function under the process constraints composed by mechanism models, bounds, quality and security etc. Several kinds of objective functions for different demands are also analyzed and discussed. The effectiveness of EMPC is illustrated with some numerical simulations.

Research on Parameter Optimization of Linear Motor Based on Hybrid Bat Algorithm

2020, 56(2): 0-0.

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When solving model and data optimization, choosing a suitable optimization algorithm can usually get great improvement in work efficiency. The Hybrid Bat Algorithm proposed in this paper combines the standard bat algorithm with niche ideas, and introduces the velocity and position update formulas in the particle swarm optimization algorithm. In this paper, the optimization experiments of the acceleration parameters of the linear motor motion model are carried out by using BA and HBA respectively. It is proved that the HBA has faster convergence and higher solution accuracy than BA algorithm. And the HBA has great practical value.

Design of Fire Alarm System for Algiers Refinery

2020, 56(2): 0-0.

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Aiming at the design of fire alarm system for international refinery project, this paper expounds the composition and characteristics of fire alarm system from the aspects of network structure, alarm circuit setting, detector layout and wiring installation, analyses the requirements of linkage control under different alarm conditions and proposes a solution.

Research on Regional Integrated Energy System Management Method Based on Parallel Control

2020, 56(2): 0-0.

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Abstract: Energy is the key factor of national production, which is related to the fundamental of the country. In the face of increasingly prominent energy issues, regional integrated energy system to improve the energy efficiency, promote the large-scale development of renewable energy, and can reduce the use in the process of environmental pollution and energy supply security, and realize the goal of energy conservation and emissions reduction is of great significance, has become the important strategic research direction in the field of energy around the world. Based on the theory of parallel control of complex systems, this paper puts forward an optimal management method suitable for regional comprehensive energy system, which realizes dynamic and intelligent energy management by setting up virtual artificial system and interacting with real system in parallel. The construction of virtual artificial system also provides an effective platform for the application of advanced technologies such as cloud computing, big data and artificial intelligence in integrated energy system.

Design of Monitoring and Management System of Water Shutoff and Profile Control in Oilfield Based on B/S architecture

2020, 56(2): 0-0.

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In order to meet the needs of informationization management in oilfield water shutoff and profile control construction site, achieve the purpose of real-time monitoring of construction process, effectively improve the management level of water shutoff and profile control and the quality control of construction process， with the help of internet of things USN (Ubiquitous Sensor Networks) architecture, relying on three-terminal framework technology: sensor, server and application, The monitoring and management system of water shutoff and profile control based on B/S structure as the system architecture is designed and implemented. The system supports data communication by LAN and GRPS. The LCD touch screen built in the front-end acquisition unit of the system supports for display and input from construction data, The back-end of system that the remote monitoring and management platform which supports Web browser displays real-time construction data which include flow, pressure and video during water plugging and profile control construction. The functions of real-time analysis, early warning, index statistics and automatic generation of curve report forms of water injection and plugging profile control wells are realized, which meet the requirements of fine, digital and flat management of water injection and plugging profile control wells under the oilfield digital management.

Pipeline internal corrosion direct assessment and repair technology research

Chang-Jing LIANG

2020, 56(2): 0-0.

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Development and Application of On-line Paraffin Cleaning Device for Self-energy Steam Automatic Hot Washing Oil Well

2020, 56(2): 0-0.

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Aiming at the problem of high cost and pollution of formation caused by conventional hot water backwash method in oil wells, an on-line paraffin removal device for self-energy steam automatic hot wash oil wells is developed. It uses self-produced liquid of water source wells and associated gas of oil wells as well washing fluid and energy for hot wash oil wells, so as to achieve the purposes of energy saving, paraffin removal, reservoir protection and safe production. Field application shows that the device has the characteristics of convenient movement, high automation, simple operation, low cost of wax removal, no pollution to oil reservoirs, good economic and social benefits.

Research on Oil and Gas Pipeline Defect Detection Method Based on Multi-data Fusion and Wavelet Decomposition

2020, 56(2): 0-0.

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Aiming at the problem that it is difficult to locate the leakage area and defect area accurately in the process of oil and gas pipeline inspection, this paper presents an automatic detection method for oil and gas pipeline defects based on multi-data fusion. Firstly, UAV and infrared thermal imaging technology are used to collect the infrared image of oil field pipeline in segments and upload it to the processing system through mobile terminal in real time. Then, an improved weighted median filter algorithm is used to denoise the infrared image, and the pipeline area is automatically identified according to the comprehensive features to improve the detection efficiency. Sobel operator and Canny operator process image of pipeline area, and weighted average the two images. Finally, Haar wavelet is used to decompose the high-frequency component, and the location where the high-frequency component coincides with the temperature anomaly area in infrared image is the defect area of oil and gas pipeline. The experimental results show that the method can accurately locate the defective areas of oil and gas pipelines, with the highest accuracy of 97.8%, and the detection efficiency has also been improved.

Design of Uninterrupted Power Supply System for Chemical Instruments

2020, 56(2): 0-0.

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Uninterrupted Power Supply(UPS) is an essential power for instruments at chemical plant, the reliability of UPS is very importance. At first, the configuration and working principle of UPS are introduced briefly. Secondly,the power output of UPS is explained in detail．Lastly, the redundancy mode and the calculation of capacity for UPS are discussed．

Research and application of low production and efficiency interval pumping technology based on oil well dynamometer card

2020, 56(2): 0-0.

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Effective development of Low-yield and low-efficiency wells reflects the high quality of oilfield development and is an important grasp for realizing cost reduction and efficiency enhancement. The key to the rational development of Low-yield and low-efficiency oil wells is the determination of the interval system. Through the research of interval technology, combined with the results of power chart production calculation and dynamic liquid level calculation, this paper puts forward a method to determine the interval of Low-yield and low-efficiency oil wells by three-time switching wells. By using computer technology, the intelligent determination of the interval system of oil wells is realized, and field practice is carried out. The results show that the method has achieved the goal of reducing cost and increasing efficiency. At the same time, the method also provides a reference for the intelligent interruption of this type of wells.

Discussion on Engineering Design of GDS Alarm and Control Equipment for Petrochemical Plant

2020, 56(2): 0-0.

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Based on the summary and engineering design of the combustible gas and toxic gas detection system (GDS) of petrochemical plants，this paper analyzes irrationality of some GDS alarm and control equipment settings, and puts forward a reasonable engineering design scheme of GDS alarm and control equipment in petrochemical plant, which provides engineering design reference for engineers.

On Grounding of Cable Shielding Layer

2020, 56(2): 0-0.

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bstract: In order to suppress interference from magnetic field, two ends of shielding layer for the cable are often grounded, which is a commonly used method in engineering. In this paper, the shielding mechanism of this method is discussed in depth. It is pointed out that when there is a difference of ground potential between the two grounding ends of shielding layer for signal cable, will bring serious interference effects. This paper proves the existence of this phenomenon through two case studies.

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