Automation in Petro-Chemical Industry

Study on pipeline failure probability calculation based on fault tree - bayesian network

Chang-Jing LIANG

2021, 57(3): 0-0.

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Construction and thinking of security system of industrial control system in intelligent factory

2021, 57(3): 0-0.

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The safety network architecture, life cycle safety management and integrated safety monitoring platform of industrial control system in intelligent factory are introduced. This paper expounds the methods and suggestions of constructing the safety system of industrial control system in intelligent factory.

Mining Oil Field Manager Software Functions to Improve the Level of Oilfield Dynamic Analysis

2021, 57(3): 0-0.

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Large amounts of dynamic data are the foundations of modern oil oilfield digital construction. Depending on reliable software functions, the computer ability can be fully utilized to enable engineers to correctly export the data needed for analysis and efficiently complete repetitive statistical task, in the contrary, it may take a lot of energy on data export and repetitive statistical work, leaving small amount of time for statistical results analysis and countermeasures making. In order to ensure the quality of dynamic data statistics, improve efficiency, the application of OFM software is extended by the project team of M Oilfield, as well as continuously deepened and masters the software functions, which define calculate variables and fields using its system functions for data table exporting and figure makings. The project team has mastered OFM Arps decline analysis module, achieves changing daily dynamic data into monthly ones, filtering and grouping wells flexibly, and short-term production forecast and evaluation, which has corrected statistical errors in monthly report bulletin and data export for dynamic analysis, improves working efficiency and accuracy of short-term production forecast.

Analysis of the reasons for the shutdown of ethylene cracking gas compressor and improvement measures

2021, 57(3): 0-0.

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In this paper, through the investigation and analysis of the shutdown event of a company's ethylene cracking gas compressor, the reason of the unit's shutdown was finally found out: the short circuit of the stable power supply module in the control system cabinet of the cracking gas compressor caused the loop's air opening and the air opening trip of the power supply of the upper level, which then led to the power loss of the power supply of the same level to the trip solenoid valve. Because the local pressure gauge in the middle of the trip solenoid valve is too long and the oil pressure does not meet the pipe, the trip solenoid valve lost power and opened at the moment, resulting in the filling process of the pressure gauge in the local pressure gauge. As a result, the T&TV valve was shut down instantly due to the control of oil pressure, and the unit was shut down interlocked. At the same time, preventive measures are put forward to avoid similar failures and ensure the stable operation of the unit.

Discussion on selection of safety evaluation criteria for corrosion defects of long distance pipeline

2021, 57(3): 0-0.

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Corrosion is the most important factor affecting the safety of pipelines, which can easily lead to pipe leakage or rupture. China pipeline industry implemented integrity management procedures. Pipeline enterprises should carry out residual strength evaluation and residual life prediction according to previous failure events of pipelines to determine the acceptable criteria of pipeline defect risk. The paper describes the international common safety evaluation criteria for pipeline defects, including the revised ASME B31G, BS7910, DNV-RP-F101, PCORRC, C-FER model and PDAM model. The parameters, defect characteristics and burst/failure pressure data of nearly 100 cases with corrosion defects in different steel grades (x42-x100) were collected, and the accuracy of the above evaluation criteria was compared. Pipeline managers should select scientific and reasonable evaluation criteria according to pipeline operation condition and defect characteristics, considering the application scope and application conditions of evaluation criteria. Finally, according to the safety evaluation method of X90 and X100 ultra-high steel pipeline defects, the research suggestions of finite element numerical simulation are put forward.

Design and application of combustible gas detection and alarm system

2021, 57(3): 0-0.

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With the development of industrial automation, petrochemical enterprises pay more and more attention to safety production. It becomes more widespread to design and apply the combustible gas detection and alarm system. This paper combines the design experience of a domestic large-scale refinery and long-distance gas transmission pipeline to list the composition of combustion gas detection and system. It emphatically introduces the classification and application of combustible gas detectors. And it analyses differences among catalytic combustion type, infrared type and laser type. This paper also explains the necessity of the independent setting about combustible detection and alarm system from the point of reliability. It provides design schemes in the different application circumstances (for alarm purposes only, participating in fire linkage, participating in safety interlocking). At last, it expounds the practical application of the combustible gas detection and alarm system. The subsequent engineering design can learn from it.

Discussion on the design and selection of high pressure steam venting valve

2021, 57(3): 0-0.

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According to the difficulties about designing and selection of high pressure steam vent valve, analyzed and summarized the problems in practical engineering application based on the characteristics of service conditions of steam venting valve, On this basis, discussed the typical structure characteristics of steam venting valve by theoretical analysis, This paper benefits the improvement of the design and selection of steam venting valve.

Brief analysis of control scheme application for key equipment in Residue hydrotreating unit

2021, 57(3): 0-0.

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Residue upgrading is an important way to effectively utilize petroleum resources and meet the increasing market demand for light and middle distillate. Residue hydrotreating process has gradually become one of the important means of residue upgrading. The residue hydrotreating unit is characterized by hydrogen exposure, high pressure, high temperature and high H2S corrosion, The monitor of key equipment becomes the key to the safe and stable operation of the residue hydrotreating unit. From the view of engineering design, this paper analyzes and explores the design and application of control scheme for key equipment in residue hydrotreating unit.

Application of fruit fly optimization algorithm in the temperature control of fracturing variable frequency cooling

2021, 57(3): 0-0.

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In view of the high requirements for temperature control when high-power oil field fracturing equipment is operated on the industrial site, the frequency conversion equipment needs to cooperate with the cooling cycle system and maintain a stable working temperature to operate normally, but the cooling temperature control has a large time lag and multiple interferences, etc. Non-linear links lead to low control accuracy, and it is difficult to achieve the desired control effect. Based on the process analysis of the all-electric fracturing variable frequency cooling system, this topic proposes a PID controller based on the fruit fly optimization algorithm and optimizes the parameters. The simulation test shows that compared with the traditional scheme, the scheme proposed in this subject has the advantages of fast response speed, small overshoot and good robustness, etc., which provides a reference for the all-electric fracturing variable frequency cooling temperature control system.

Combustion control of Claus furnace for unconventional split flow sulfur recovery

2021, 57(3): 0-0.

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The increasingly severe environmental protection situation in China puts forward stricter requirements for combustion control of sulfur recovery unit. According to the process characteristics of unconventional split flow sulfur recovery unit in a high sulfur natural gas purification plant, the complex control loop is used to control the air distribution and furnace temperature of Claus furnace. The temperature of the first zone of Claus furnace is controlled by adjusting the split ratio to ensure the optimal reaction temperature. By adjusting the main micro air volume and controlling the air distribution ratio, the optimal conversion requirements of acid gas are met, the sulfur recovery rate of the unit is improved, and the emission of flue gas pollutants is reduced.

Design and Implementation of ADRC Technology in Pneumatic Convey System of PP Plant

2021, 57(3): 0-0.

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In view of the large economic loss caused by the strong disturbance occurring in pneumatic convey system of PP plant in a company, the active disturbance rejection control technology (ADRC) is introduced into the design of the control system and implemented by PLC. Better control effect is obtained and the economic loss of the company is reduced. Compared with the classical PID control method, the application of ADRC technology can reduce the pressure fluctuation in pneumatic convey system and ensure the product quality better.

Research and application of remote monitoring system for Cathodic protection of oil pipeline

2021, 57(3): 0-0.

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Aiming at serious corrosion of oil pipeline in Changqing Oilfield, the remote monitoring system for Cathodic protection of oil pipeline is studied, and the structure and function of the remote monitoring system for Cathodic protection of oil pipeline are introduced. In 2019, the system was applied to the oil pipeline in Tongzhai working area of No. 3 oil production plant of Changqing oil field, and the CATHODIC protection of the oil pipeline was realized, at the same time, it can monitor the state of Cathodic protection and adjust the working state of Potentiostat, and cooperate with the expert system of Cathodic protection.

Research on Statistical Soft-sensor Modeling

2021, 57(3): 0-0.

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In this paper, the problem of soft sensor modeling based on statistical method is studied, and a general soft sensor model architecture and its parameter tuning method are proposed. Taking the AMS concentration estimation of the actual Styrene Distillation Process as an example, the validity of the proposed model and its updating algorithm was verified, which laid a foundation for the following quality control.

Construction of alarm push management system help intelligent transformation of production control

Baoqiang Mou

2021, 57(3): 0-0.

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Relying on the achievements of the companys information construction over the years, making full use of the network technology and mobile short message platform, a unified alarm push management system is established. The important alarm information of the companys instrument, quality, environmental protection, technology, equipment and other major alarm information is divided into three levels according to the importance of the company, such as company level, factory level and workshop level, and the standardization and standardized management of alarm data is realized. The real-time monitoring of all important key points all-weather ensures the timely detection, accurate location, accurate handling and closed-loop management of abnormal faults in the companys production, greatly reduces the labor intensity of the business personnel, saves the cost of operation and maintenance, and promotes the transformation of the production control of the company from labor-intensive operation and maintenance to intelligent operation and maintenance.

Cloud Server Remote Control System Based on OPC UA

2021, 57(3): 0-0.

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The research of control algorithm is mostly realized by simulation, but the real practical application value still need to be tested in practical engineering. Mature algorithm control often needs field test. Therefore, aiming at the time and space limitation between algorithm control and engineering, this paper proposes a cloud remote control system based on OPC UA. The system uses KEPServer software and OPC technology to solve the problem of remote data transmission when different hardware devices are controlled. At the same time, the algorithm is put into the cloud server, which effectively breaks the barriers in time and space, and realizes remote control anytime and anywhere. In practical application, the remote control system has successfully controlled the chromatographic column temperature of the enterprise by using predictive PI control algorithm, and achieved good results.

Research on the application of management of big data of liquid level meter in gas station

2021, 57(3): 0-0.

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With the popularization and application of the liquid level instrument system in gas station, the liquid level instrument system automatically generates a large number of data of the purchase, sale and storage of oil products in gas station．It provides the big data support for the fine management of oil loss in gas station. It is extremely urgent to study the application of big data of gas station liquid level instrument system to the fine management of oil loss in gas station. This paper studies the application of management from three aspects: upward traceability daily management and outward extension. Its purpose is to maximize the role of big data for enterprise management services.

From reactive maintenance to asset performance management, the development trend of petrochemical asset maintenance strategy

2021, 57(3): 0-0.

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This paper reviews the four technical development stages of asset maintenance, introduces the connotation and maturity levels of asset performance management (APM), analyzes the similarities and differences between different analysis technologies and maintenance strategies, analyzes the market situation of APM software from the perspective of industrial software, as well as the international suppliers of APM solutions in petrochemical industry, and finally discusses the maturity of domestic independent petrochemical APM software.

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