Automation in Petro-Chemical Industry

Brief Discussion on Application of Human Exposure Probability in Layers of Protection Analysis

2021, 57(2): 0-0.

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Combining with the layers of protection analysis (LOPA), through the establishment of event tree model which analyzes the human exposure probability relations with independent protective layers, and combining with the analysis of larger and major accident in correction factors of human exposure probability, make the LOPA analysis get more accurate results in risk analysis and formulate corresponding risk control activities.

Development of PLC automatic control system for belt tension of pumping unit

2021, 57(2): 0-0.

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Abstract:When the pumping unit is working, due to the up and down reciprocating movement, the load balance change makes the belt fatigue, wear fast, the service life is short, and the belt is easy to slip in rainy and snowy weather, which directly affects the service life of all components of the pumping unit and the operating time rate of the pumping unit. The automatic control system of belt tension of pumping unit takes PLC as the core. By detecting and judging the output torque value of frequency converter, the belt tension of pumping unit can be adjusted automatically. The test results show that the system can accurately control the tension of the conveyor belt of the pumping unit and ensure that the belt is always in good working condition.

Data interaction between PDMS and CAESARII

2021, 57(2): 0-0.

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This paper analyzes the shortcomings of traditional data interaction between PDMS and CAESARII, and puts forward a method to realize data interaction automation through secondary development. At the same time,the design idea of the program,how to deal with the model data of PDMS and how to organize the neutral file are introduced. Finally, a reasonable and concise program interface is designed, the stress model derived from the PDMS model is also presented.

Design on Inductive Lightning Protection in Stations for Oil/Gas Pipelines

2021, 57(2): 0-0.

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With the continuous improvement of oil and gas pipeline station information system, the number of instrument, communication and other weak current equipment is also increasing, and the automation and communication system in the station has become the nerve center of oil and gas pipeline. However, most of the oil and gas pipeline stations are located in areas with extremely complex thunderstorm activities, and there are many devices, so lightning strikes occur from time to time. Lightning strikes are mainly manifested as direct lightning and inductive lightning. Inductive lightning usually harms weak current equipment such as instrument and communication, resulting in the interruption of station information system and affecting the monitoring and information transmission functions of oil and gas pipelines. For the stations of Sino-Myanmar Oil/Gas Pipelines (the pipeline sections in Guizhou Province) is taken as an research case. According to the characteristics of oil and gas pipeline stations, this paper analyzes its causes in terms of manifestations of induction lightning invading into weak current equipment, and adopts comprehensive lightning protection design concepts, namely, shielding, equalizing voltage and grounding, proposes specific lightning protection measures so as to reduce the induction lightning, and achieves better lightning protection effect and improves the reliability of oil and gas pipeline station operation.

Development Trend of Manufacturing Execution Systems in Petrochemical Industry

2021, 57(2): 0-0.

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This paper summarizes the development history of MES system in petrochemical industry, and focuses on the control demand of petrochemical industry at the level of production execution under the background of industry 4.0. Based on this, this paper analyzes the research and application results of MES system development, focuses on artificial intelligence, industrial internet of things, Cyber-Physical system and other emerging technologies, and puts forward the future development direction of MES system in petrochemical industry based on understanding and experience of petrochemical industry. Finally, the paper analyzes the application future of MES system in petrochemical industry, affirms the development prospect of MES system in future process industry.

Technical difficulties and Countermeasures of cathodic protection for long distance pipeline

2021, 57(2): 0-0.

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Pipeline safety is increasingly concerned by the state, society and industry. Corrosion is an important cause of pipeline failure. Cathodic protection is a reliable technology to relieve pipeline corrosion. China new pipeline projects are constructed in harsh environment areas, and new corrosion problems are emerging, which puts forward higher requirements for the safe operation of pipelines. The paper describes the technical difficulties and bottlenecks of pipeline corrosion protection in recent years, including cathodic protection criteria, cathodic protection potential test, pipeline cathodic protection in cold regions, cathodic protection system maintenance, 3LPE anti-corrosion coating stripping, corrosion under insulation, cathodic protection of pipeline crossing with casing.Combined with the domestic and foreign pipeline engineering practice, standards and technical status, the feasible and reasonable response methods and measures are put forward. Finally, in order to improve the level of pipeline safety management of China, some suggestions for tackling key problems in pipeline cathodic protection technology in the future are put forward.

Study on fire spacing of air vent riser in gas pipeline

Chang-Jing LIANG

2021, 57(2): 0-0.

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Abstract: in view of the GB50183 gave no vent quantity more than 4×104 m3 / h when fire separation, adopting det norske veritas DNV PHAST software for different vent quantity under the condition of different wind speed and gas diffusion and to simulate the thermal radiation scope, determined the cold blow-down operation, between the riser and the oil and gas station fire prevention spacing should be not less than 0.5 LFL limit boundary space; In heat venting operation, the fire prevention interval shall not be less than 4.75kW/m2, the boundary space limited under the condition of permissible heat radiation. The results show that when the discharge volume is 20×104m3/h and the wind speed is 20m/s, the fire spacing of cold discharge and hot discharge is 29.4m and 67.2m respectively, which are all less than the fire spacing between riser and station specified in GB50183. The research results can provide technical reference for the compilation and update of GB50183 and theoretical basis for the layout and general drawing design of oil and gas station.

Analysis of DC Stray Current Interference and Treatment in a Product Oil Pipeline

2021, 57(2): 0-0.

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With the development of urbanization, there are more and more intersections or parallels between the pipelines of refined oil pipelines and subways/light rails, causing greater DC stray current interference to the pipelines, which may cause cathodic protection to fail during pipeline operation, and there are operational risks . This article mainly introduces four common drainage methods, separately elaborates the advantages and disadvantages of each drainage method, and compares the drainage effect of our company's ground drainage method and the newly adopted DC forced drainage method.

Control scheme design of oil and gas recovery system in tank area

2021, 57(2): 0-0.

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In order to reduce the volatilization of organic waste gas and collect it effectively, this paper focuses on the control scheme of adding oil and gas recovery system from the perspective of engineering design, and configures it in DCS in the form of logic diagram, so as to realize the control of oil and gas recovery system and achieve the collection The purpose of collecting waste gas, and from the safety point of view, the recovery system is designed to increase the operability and safety.

Design and Implementation of Ultrafiltration Membrane Pollution Prediction System Based on B/S Architecture

2021, 57(2): 0-0.

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Aiming at the problem of ultrafiltration membrane pollution in the treatment of landfill leachate, this paper proposes and designs a set of methods and systems for evaluating the status of ultrafiltration membranes pollution. The system uses the B / S architecture and the optimal algorithm model trained by the neural network to predict the pollution of the ultrafiltration membrane, so as to achieve the effect of membrane pollution early warning. The front-end display part uses the Jquery + Bootstrap + Highcharts framework, and the back-end business part uses the SSM (Spring + SpringBoot + MyBatis) composite framework, and uses ajax to implement front-end and back-end data interaction. After the online test and on-site trial operation, the system has been formally put into use and achieved good results.

Research on The Control Algorithm of Gas Stepless Regualtion System

2021, 57(2): 0-0.

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Gas stepless regulation system has been widely used in the reciprocating compressor driven by high-power motor in petroleum, chemical and other enterprises. It can not only realize the continuous regulation of the exhaust volume of the reciprocating machine, but also minimize the power consumption of the reciprocating compressor and reduce the operating cost of the enterprise.Because the reciprocator driven by high-power motor is the core equipment of the enterprise, which plays a decisive role in the daily production process, it puts forward high requirements for the control performance of the gas stepless regulation system, so as to ensure that the reciprocator can operate safely, stably and reliably after putting the gas regulation system into operation, and realize energy saving and consumption reduction. This paper studies the control performance of the gas stepless regulation system, which makes the reciprocating machine stable and reliable in the aspects of start and stop, exhaust volume regulation, stable pressure ratio at all levels, etc. when the gas regulation system fails, it can also be cut off by intelligent interlock without affecting the normal operation of the reciprocating compressor.

Centrifugal Compressor Control and Protection

2021, 57(2): 0-0.

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The machinery damage and process shutdown due to failure of either control or protection occasionally occur in large chemical or petrochemical plants. This text outlines the control and protection schemes of steam turbine driven centrifugal compressor and comprehensively explain instrument control and interlock functions which are applied in centrifugal compressor, it has certain reference to the design of instrument function and the selection of compressor control system for compressor and its support system.

Design and method of laboratory test platform for electromagnetic paraffin control in oil well

2021, 57(2): 0-0.

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in view of the fact that there is no way to test the electromagnetic paraffin control effect of oil wells indoors, a general dynamic test platform for electromagnetic paraffin control of oil wells is designed, which solves the problem that there is no specific electromagnetic paraffin control situation of oil wells in the dynamic environment accurately simulated indoors. The dynamic experiment is carried out by using the relevant parameters optimized by the static experiment. Through the comparison of the test results, the current situation of the production technology in the field of oil well paraffin deposition is understood, and the oil well paraffin prevention technology and method suitable for the characteristics of the oil field are explored, and the influence law of temperature, flow rate, etc. on the effect of electromagnetic paraffin prevention is obtained.

Experimental Application of WIA-PA Wireless Communication Technology in Oilfield Internet of Things

2021, 57(2): 0-0.

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Abstract: the internet of things construction in Daqing Oilfield has been started, whose oilfield distribution is wide, oil-water wells disperse and geographical environment is complex. There are some troubles in the selection of well site wireless instrument communication technology. Faced with the uncertainty of all kinds of wireless communication technology applying to the oil fields, Daqing Oilfield conducts experimental analysis on WIA-PA wireless communication technology, in order to test the transmission capability, instrument stability, data accuracy and so on, which provides the basis for the design of WIA-PA wireless communication technology in subsequent internet of things construction.

Digital Virtual Commissioning based on SIMIT platform

2021, 57(2): 0-0.

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Abstract：In order to explore more application scenarios of digital virtual Commissioning, further shorten the commissioning time of new production lines or plant expansion projects. In this project, Siemens simit digital virtual Commissioning platform is used to carry out modeling, simulation and virtual Commissioning from three levels of signal, equipment and process device. Before the actual project Commissioning, a comprehensive early test is carried out on the engineering configuration. Simit digital simulation platform is used for virtual Commissioning, and the online operation without errors and faults is realized. It has a practical role in promoting the Commissioning efficiency and reducing the Commissioning cost, and can provide certain reference for the application of digital virtual Commissioning in similar projects.

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