Table of Content

20 June 2018, Volume 54 Issue 3

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Development and Commentary

Safe production is the premise of enterprise development -Participated in the analysis and comprehension of the common problems of security check of 2017 group company.

Shi-Heng YU

2018, 54(3):  0-0. 

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Engineering Design and Standards

Design of control system for living water treatment device based on DCS

2018, 54(3):  0-0. 

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Based on the process flow of the living water treatment device, the overall design of the control system and configuration of DCS are put forward. Through the design of control system for pretreatment unit and membrane treatment unit, automatic treatment of living water is realized, which provides effective guarantee for achieving drinking water quality index.

Design of Liquid Ammonia Tank Automatic Monitoring System

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Liquid ammonia is a dangerous chemical product. Liquid ammonia tank leakage may easily lead to personal property and safety accident. A design scheme of automatic monitoring and control system for liquid ammonia tank is proposed for a 35000m3 volume tank in this paper. The monitoring system is composed of a distributed control system (DCS), an emergency shutdown system (ESD), a tank gauge system (TGS) and a toxic gas detection system (GDS) to complete the normal state monitoring, emergency shutdown, tank level on line measuring and toxic (ammonia) gas detecting respectively. In addition, a leak detection method based on multi-point temperature and guided wave radar is designed for the special condition of inner and outer tank gap. Moreover, the special instrument selection method for multi-point wall mounted temperature and inner tank valve is also presented. The designed scheme can steadily monitor the state of liquid ammonia tank, and it is feasible.

Optimization on Horizontal Setting Distance of H2S Detector Based on Flacs

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CFD software FLACS is selected to simulate falling distance of H2S leakage accident from a sulfur recovery unit. Different impact factors, such as leak height and leak direction, are analyzed to optimize horizontal setting distance of H2S detector. Conclusions are drawn as followed: (1)H2S detectors could be set according to current design code when leakage accident happens lower than 3m height. (2)When leak height is between 3m and 7m, the relationship of horizontal setting distance of H2S detector shown as L and leak height shown as H satisfies the formula: L=11.6H-23.2. (3)When leak height is higher than 7m, the relationship of L and H satisfies the formula: L=7.9H-29.

Discussion on Fire and Gas System Design

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For the fire alarm and gas detector system (FGS) has not been widely used and the relative lack of engineering design experience, this article introduces the application status and basic architecture of FGS system, and discusses its design contents and methods, fault safety problem, key points of the system configuration and so on.

Discussion on Instrumentation Control System Grounding of Large Joint Chemical Plant

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Abstract: After serious studying on the instrumentation control system fault caused by disordered grounding system in practice, the author convinces you in this text that comparing with combining instrumentation signal loop ground strap and shielded ground strap as one ground strap, separately setting up instrumentation signal loop ground strap and shielded ground strap in instrumentation control system cabinet can allow the instrumentation control system obtain more stable benchmark reference zero potential, suppress the external electromagnetic interference, furthermore, which allows the instrumentation system operate in a long term and stable way.

Process and Technology

Research on MPC-PID Cascade Control of Electric-heated Thermostatic Water Bath

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Control method of process system is a key and challenging problem because of its inherent strong nonlinearity, large lag and high control precision requirement. A single algorithm generally cannot meet the requirements with the upsizing, integrating, complication of production equipments. The research on MPC-PID cascade control of process system can help to improve the system accuracy, which has important theoretical and practical significance. In this paper, the MPC-PID cascade control is studied, which takes the electric-heated thermostatic water bath as a controlled object. The process model of the electric-heated thermostatic water bath is developed, and simulation control of the electric-heated thermostatic water bath is carried out using MATLAB. The MPC-PID cascade control is contrasted with PID-PID and MPC, and the major control parameters are studied. The control simulation results show that MPC-PID could provide more effective control strategy for industrial process.

New research on suspension point displacement measurement of oil well pumping unit

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In the oil pumping machine displacement measurement system, the noise and trend of acceleration signal are the two main interference factors of reducing suspension point displacement measurement’s accuracy. On the basis of the problems of obvious noise and large measurement error by the traditional method, it is presented a new method for measuring displacement of oil pumping machine. Firstly, random noise and pulse interference of acceleration signal could be eliminated by composite filtering method. Then the measurement cycle could be promoted by improved cycle extraction algorithm. Finally, integral trend is eliminated by efficient empirical mode decomposition method. Combined with the measured data in Yanchang Oil Well, final experimental results show that interference noise, DC component and trend term are obviously reduced, and the accuracy of displacement measurement is up to 92.74, which lays a good foundation for the noise elimination by other filtering methods. In addition, it’s of great significance to make research on the displacement measurement of oil well pumping unit.

The Application of SCADA System in Urban Sewage Treatment

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Introduce the structure and topology of the control system of sewage treatment in Turkey．It used PLC-SCADA system. Different from domestic design, it prefer to use industry communication rather than hardwires to introduce the field signal into system. It contains three control levels, including field detection and execution level, area control level and central monitor and management level. The topology of networks between levels is redundant ring type. Take SIEMENS system as an example, the article stated how to use Profibus DP protocol to form a ring network between PLC and its I/O station, and how to use Profibus PA protocol to form a ring network between field detection and execution level and area control level.

The Application of Intelligent Remote Control System in Hydrogenation Device[]

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Under the influence of several national smoggy weather, the state's efforts to control air pollution have been strengthened, and the energy saving and emission reduction of cars is one of the main measures.Hydrogen can be regarded as "green environmental protection, zero pollution, zero emission".People tend to focus on the research and development of fuel cell vehicles and ignore the development and research of hydrogenation equipment and control systems.However, hydrogen equipment and control system is one of the key technologies for the successful marketization of hydrogen fuel cell cars.In this paper, on the basis of traditional SCADA control system is proposed based on computer cloud technology, 4G wireless communication, mobile phone APP solution, improve the level of the hydrogenation equipment supervision, improve the level of the safety control system maintenance, enhance the user experience.

Information Technology

Development and Application of Information Platform based on production management

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The article mainly analyzes the specific application of the information management system platform for the production line in the actual production management. This article focuses on the development and application of information system for production report system into data acquisition system, oil pump unit and equipment management information system., and building the development of information management system's platform and not only closely the production team’s actual production work, but also actually to improve the work station management level of production team , and to truly implement the" prevention of maintenance "has laid a solid foundation for the idea, and grab the standardization of the maintenance work, specification provides support and powerful data support platform of maintenance operations, this platform has a strong reference.

Instrument and Meter

Development and application of on-line verification device for crude oil moisture analyzer

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According to the analysis of water content in crude oil by distillation still need assay methods, collected oil samples back to the laboratory for analysis of water content, testing time is long, the labor intensity and manpower consumption, not safety and environmental protection. The development of crude oil water content analyzer online verification device, can quickly and accurately detect environmental safety detection of water content in crude oil, crude oil content analyzer into various types of test accuracy; and can carry water in oil analyzer to the scene for verification, at the same time with 0 ~ 100% of water content in crude oil sample standard of each point, continuous measurement simulated oil field oil pipeline on-line analysis of water content in crude oil. Field application was carried out in Changqing oil field third oil production plant in 2016, which meets the requirements of oilfield development at present.

The error analysis and discussion of two kinds of density compensation methods for DCS fitting formula method the measurement of medium pressure steam flow measurement

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This paper briefly describes a certain refinery since the power plant to 3.5 MPa medium-pressure steam line flow rate measurement by the introduction of intelligent flow totalizer.especially to DCS system configuration, real-time compensation calculation transformation plan, focusing on the steam flow measurement in the process of temperature, pressure, density compensation method question has carried on the comprehensive analysis, comparison of the superheated steam pressure in the 0.10-5.0 MPa, in 310-450 ℃ temperature range of the look-up table of steam density and density of three kinds of fitting formula of the density of the error analysis, mainly studies the pressure in the 3.0-4.5 MPa, the temperature of superheated steam within the range of 390-430 ℃ calculation error values of density and density of the look-up table, select the error between 0.1 to 0.7% of the optimum fitting formula 3.2 2 formula [2] as the north gate medium-pressure steam metering introduce DCS system online compensation optimum calculation formula for computing the implementation plan, and further confirmed that the pressure and temperature range is suitable for use by the density compensation formula fitting.

Application of Non-contact Magnetic Detection Technology in Detection of Crude Oil Pipeline

Xing-lan SUO

2018, 54(3):  0-0. 

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This article describes the principle of non-contact magnetic detection technology. Application of KMD-01M Non-contact Magnetic Detector can detect defects of heavy crude oil pipeline in trenchless condition. Through excavation of pipeline, it verifies operability and reliability of the detection technology. Based on the test results, it proposes maintenance suggestion and measures for high-risk section and high-consequence section. For the safe operation of pipeline, non-contact magnetic detection provides a strong technical support.

The Estimate and Analysis of the Sampling Transmission Lag Time for On-line Analyzer

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The estimate of the sampling transmission lag time is an important mission for analyzer engineering design. This paper estimates the sampling transmission lag time for an on-line analyzer for propylene by the means of volume flow method. The paper also presents the key factors of sampling transmission lag time which can be greatly shortened by decreasing the distance from sampling probe to the pressure reducing valve or increasing the flow rate of fast loop. Issues about the on-line analyzers are also summarized in this paper for engineering design reference.

Innovation and Practice

Failure Analysis and Countermeasure Implementation of Fire Interlocking System in Crude Oil Storage

2018, 54(3):  0-0. 

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Fire linkage system is an important reservoir of crude oil storage facilities, due to the nature of the storage of crude oil storage tanks, fire linkage system as the reservoir area is an important early warning of fire and emergency equipment. In the day-to-day management of the reservoir area, the reliability and utilization rate of the fire-fighting system are the most important. Therefore, the common faults of the system should be analyzed in the management process, the causes of the problems should be analyzed, and the corresponding measures should be formulated.

Application of Auto-Control Integrated Design Based on SP3D Software

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Abstract: The traditional automatic control design is carried out on AutoCAD. The drawing is mainly schematic and the actual construction deviation is large, which often causes the site layout installation and material waste problem. SP3D is the core software of SPF. Each professional can work together for three-dimension layout and installation design. SP3D improves the traditional design mode of automatic control. This paper introduces the work content of automatic control design using SP3D, and summarizes the customization and application technique of software in combination with the application of actual project. Using SP3D for automatic control design can not only improve the design quality, but also shorten the design cycle and optimize the design.

Discuss the layout of catalytic combustion type combustible gas detector

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There are many kinds of combustible gas existed in factory at the same time usually, Instrument discipline need to choose the right calibration gas which was provided by process discipline for combustible gas detector vendor. This article says the instrument discipline how to choose the right combustible gas detector calibration gas.

Selection and Evaluation of Oil-Water Interface Measure Instrument for Crude Oil Sedimentation Tank On-line Modification

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As inlet crude oil watercut increase year by year, water control box of sedimentation tank in field production facilities cannot guarantee the quality of downstream product. In this paper, according to the measurement principle and installation method, the oil-water interface level instrument was selected and analyzed for an oilfield on-line modification sedimentation tank, and single flanged differential pressure level transmitter is recommended to measure oil-water interface level finally. The field practical application show that the oil-water interface can be maintained within the desired range through the closed control loop consisting of a single flanged differential pressure level transmitter and control valve in the tank water outlet line, sequentially the specification of crude oil and produced water at the outlet of the sedimentation tank can meets the requirements of production technology.