Automation in Petro-Chemical Industry

Design type analysis of offshore oil platform Wellhead Control Panel

2017, 53(3): 0-0.

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Because of the differences in technical requirements, such as geologic oil reservoirs, wellhead platform conditions and logic control, the control principle and working method of the wellhead control panel are different, which lead to the basic design of the product. In order to summarize the product type and The design features of the wellhead make up the shortage of this research direction, and provide reference for the design and selection of the wellhead control panel. The design type analysis of the wellhead control panel is needed. According to the characteristics of the components and the environment, the design features of each type of control panel are summed up and summarized, and the design scheme of the wellhead control panel is described in detail and contrasted. Electronic push-button type is divided into positive pressure explosion-proof type and flameproof type, mechanical pilot valve type according to the different platform design requirements, divided into two types of control panel, Hydraulic control and gas-liquid control, and the characteristics of each type of design and application are analyzed. The cost and maintenance cost of the mechanical pilot valve control panel is low. Taking DCS as the control core, the design is the mainstream trend. It is recommended to use it in view of cost and maintainability.

The Design of Combustible Gas and Toxic Gas Detection Alarm System in Catalytic Reforming

2017, 53(3): 0-0.

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In view of combustible gas and toxic gas in the catalytic reforming, a complete set of selection design principle about gas detection alarm system is presented. The paper analyzes several kinds of commonly used principle of gas detection, including catalytic combustion, infrared absorption, electrochemistry, semiconductor and photo-ionization, expounds hydrocarbon combustible gas and hydrogen gas should be chosen catalytic combustion type detector and hydrogen sulfide should be chosen electrochemical detector, emphasizes the photo ionization detector should be chosen for benzene gas, provides the measuring range and alarm value of all kinds of detector, and other related technical parameters requirements. Detector local setting is introduced including the confirmation of the releasing source and the installation position of detector, etc. Discusses the national and international several popular configuration schemes for monitoring system in control room and prospects the development trend of the monitoring and controlling system in future.

Design of safety supervised automation system for Water sealed Rock Caverns

2017, 53(3): 0-0.

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Recently, the emphasis of national crude oil storage’s construction has been transferred from tank oil storage to water sealed rock caverns. And the emphasis and difficulty of rock caverns’ design and construction is in the underground engineering. But the construction of our national large-scale underground rock caverns is in the fledging period, so the experiences of engineering design, construction and operation are very little. The design of safety supervised automation system in the underground engineering also need be researched, summarized and advanced, together with the reality in the rock caverns’ design and construction, the design of safety supervised automation system in water sealed rock caverns is discussed briefly.

Preliminary Discussion of SmartPlant Digital Hand-Over

2017, 53(3): 0-0.

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This paper is mainly based on the whole life cycle resolution of Plant using the Intergraph SmartPlant Enterprise, introduces the main implementation method and process in the digital hand-over for SmartPlant. The preliminary purpose of digital hand-over is to meet the foreign owner’s requirements, then becomes developing direction for engineering company under the new situation, improving the engineering business ability and economic benefit under the new technological environment.

Design and application of safety intrumented system in petro-chemical industry

2017, 53(3): 0-0.

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IN the process package preparationstage, based on GB/T 50770 - 2013 code for design of safety instrumented system in petrochemical engineering,describing the basic design principles on estimating of safety integrity level, independence of safety instrumented systemandfail-safety, presenting the consideration and design idea about design of SIS loop from three aspects of SIS input, SIS output and SIS logic. Combined with theengineeringproject, introducing the design scheme of safety interlock loop in the stage ofpreparationofpetrochemicalprocess package according to the process operation requirements and safety interlock condition, guaranteeingreasonably the reliability and availability of safety instrumented system.

Research and application of on-line monitoring and fault intelligent diagnosis system for external transmission pump unit

2017, 53(3): 0-0.

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The oil pump unit without specific online monitoring and intelligent fault diagnosis system, and there is no long-term vibration exceed the standard of safety and waste of energy, easy to cause the shutdown loss and other practical problems, developed to pump unit online monitoring intelligent fault diagnosis system, mainly by the detection of composite sensor, collector, and local multiport repeater monitoring unit and the remote monitoring unit is composed of five parts. Through the real-time monitoring of efflux pump vibration, temperature and speed parameters, running status and implementation of local and remote on-line monitoring of efflux pump units timely fault diagnosis and predict the results put forward guidance, to ensure that the pump group of safe and reliable operation, extend the fault free use period, so as to avoid unplanned stop, save operation and management cost, improve production efficiency. The field application is carried out in 2016 third oil production plant of Changqing Oilfield three pressure points, to meet the requirements of the development of Changqing green digital oilfield.

An improved shaped analysis for stiction detection in oscillating control loops

2017, 53(3): 0-0.

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Abstract: Valve stiction is one of the main causes of the control loop oscillation in industrial processes. Most of the existing control valve stiction detection methods are based on specific assumptions, only for a specific range. Aiming at the limitation that area peak method only applies to the self-regulating plant, the paper presents an improved shaped analysis method to apply to both the self-regulating plant and integrating process. Considering the obvious difference of the second derivative of error signal waves in two different plants, a new index is added to further stiction detect. The method overcomes the limitation of the area peak method only applicable to a particular range. Finally, the simulation experiment validates the effectiveness and reliability of the proposed method.

The Adjusting and Optimizing Method about Speed of Beam Pumping Unit Based on the Area Variation of Indicator Diagram

2017, 53(3): 0-0.

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Fault Diagnosis in direct-drive progressing cavity pump Based on Wavelet Packets and Neural Network Approach

2017, 53(3): 0-0.

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To diagnose accurately fault of direct-drive progressing cavity pump, this paper presents a new method of fault diagnosis based on wavelet packet and neural network. Active powers in different working conditions are decomposed using three-layer wavelet packet and wavelet packet characteristic energy(WPCE) are extracted. WPCE vectors are constructed and used as fault samples to train three- layer BP neural network. The simulation results show the trained BP neural network can diagnose the fault of direct-drive progressing cavity pump.

Availability Analysis Based on the Fault Tree for Safety Instrumented System

2017, 53(3): 0-0.

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Availability is one of important factors to measure the performance of safety instrumented system(SIS). Based on the analysis of the design characteristics for SIS voting configurations, The availability for SIS voting configurations based on the Fault Tree Analysis(FTA) is researched, which is verified by some application examples. The results show the availability for SIS voting configurations is not consistent with the design characteristics and the more accurate model need to be farther studied.

Method of rolling bearing fault vibration signal feature extraction based on MF-SVD

2017, 53(3): 0-0.

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In terms of decomposition of precision, restraining boundary effect and Computation time , Extremum Field Mean Mode Decomposition（EMMD），which is better than Empirical Mode Decomposition(EMD) and Adaptive Time Varying Filter Decomposition(ATVFD), can effectively extract the machinery vibration signal fault characteristics. But the measured field signal are often mixed a lot of immediate noise signal and the local strong interference noise, influence EMMD decomposition quality seriously. In order to solve this problem,come up with a new extracting fault feature method which Based on MF - SVD (MF，morphological filters; SVD，Singular value decomposition)denoising method combined with EMMD . The experimental results show that This method can effectively and accurately extract fault features of rolling bearing inner ring damage, also can restrain the endpoint effect ,have a good speed and accuracy.

Cybersecurity Design of DCS for Large-scale Refinery and Petrochemical Integrated Project

2017, 53(3): 0-0.

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Cybersecurity problem is vital to large-scale refinery and petrochemical integrated project. According to the design goals and principles of cybersecurity issues, based on the characteristics of refinery and petrochemical integrated project, this paper gives the solution combining three factors, which is DCS cybersecurity analysis, DCS cybersecurity protection structure, and cybersecurity management system. The implementation methods are discussed and the further research works are analyzed finally.

Application of vibration fiber technology to perimeter security at oil and gas pipeline station

2017, 53(3): 0-0.

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In this paper, the principle of vibrating optical fiber system is introduced in detail, and the performance of several intrusion alarm technologies (microwave radio, laser beam, vibration cable and vibration FOC) which are widely used in oil and gas industry are analyzed. The application example shows that the vibration fiber intrusion alarm technology has the advantages of low false alarm rate, lightning protection, anti-electromagnetic interference, anti-corrosion, anti-harsh environment, easy installation, suitable for all kinds of perimeter, no dead angle defense and other advantages, especially for oil and gas piping stations and other flammable and explosive situations.

Application of intelligent centralized monitoring in Yuanba gas field

2017, 53(3): 0-0.

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Abstract: Yuanba gas field is put forward for the first time the concept of "gathering station centralized monitoring and intelligent" in the domestic high sulfur gas field development, the exploration and practice of the new management mode of "centralized monitoring and sub area patrol inspection ". This paper mainly introduces the basic setting and security measures of the gas field under the new management mode. This model improves the automatic management level of the gas field, reduces the number of operators and improves the labor efficiency, while reducing the operating costs of the gas field.

Research and Application on the New-type Vibration Cylinder Densometer

He PU

2017, 53(3): 0-0.

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Vibration cylinder densometer is composed of vibration cylinder and amplified circuit, which is a closed-loop system of loose coupling and positive feedback. In this paper, the principle of the measurement and the design of the vibration cylinder structure and processing circuit were introduced. Through analyzing the influences of ambient noise, temperature, viscosity and flow rate on the vibration cylinder densometer, the method of reducing frequency interference was brought forward to improve the precision of the densometer. Multiple comparisons of the conveying capacity among the densometer method, manual method and mass flowmeter were made, the relative deviation of conveying capacity between the densometer method and the mass flowmeter was below 0.1 average, which is closer to the mass flowmeter measurement value.

Design of metrological verification system for natural gas mass flow

2017, 53(3): 0-0.

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Based on metrological process of natural gas high pressure,mass flow metering station, this paper put forward the overall design of traceability and metrological verification system.Through the design of data collection and processing system, this paper realizes acquisition,procession, calculation of temperature data, pressure data and flow data for the working standard device area,verification device area and checked device area.,realizes high pressure,mass flow flowmeters verification. Design of the verification system diagnosis provides effective guarantee for the accuracy of t metrological verification system.

Experimental Research on the measurement and comparison measurement device of two-phase flow

2017, 53(3): 0-0.

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This paper expounds the comparison device and method for flow meter performance detection of the two-phase flow, and through the analysis of experimental data, the relative deviation of contrast device is less than 5%. the quality of wet steam and　dryness measuring device for virtual flow calibration. According to the demand of oil field, the device can effectively cover the pressure、mass flow and dryness of steam injection in oil field.

Study on Drilling Holes at the Side of Still Pipes to Measure the Liquid Level of Floating Roof Tank

2017, 53(3): 0-0.

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Abstract：To take an accurate measurement and sample of the fluid oil quality in internal floating roof tanks and external floating roof tanks, drilling from the surface of floating roof is needed so that the still pipe can be extended to the bottom of the tank. In the meantime, in order to ensure the level testing accuracy and samples' representativeness, it also requires drilling of holes at the side of the still pipe to keep the various layers of the liquid within the tank consistent as that in the still pipe and the liquid level within the tank the same as that within the pipe. However the drilling of holes brings along gas pollution and safety issues and it's therefore necessary to change this way of operation as it is against the principles of relevantnational mandatory standards.

CNOOC Offshore Platform DeltaV Central Control System CPU Controller Overload Optimization and Modification

2017, 53(3): 0-0.

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This paper introduces the basic situation of the offshore platform central control system, and the control system CPU controller overload problem is studied and analyzed, through the optimization of control system controller, to reduce the control load control system to solve the control system for overload caused production shut down the risk, to ensure the normal production platform.

Research and application of convenient calculation on Yulin to Jinan Gas Pipeline emissions

2017, 53(3): 0-0.

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To reduce the potential risks and running cost of sewage tank, and improve its degree of product convenience, this article take further research on it, through the establish model and mathematical deduction, a new formula obtained. Verified by the theory and practice, the calculation method which improved is more conformed to the actual needs. Meanwhile, with the help of Visual Studio (VS) programming software, a visual interface is created to make the calculation more convenience, which solved the actual product problem of sewage tank very well.

Analysis of SAP system performance optimization

2017, 53(3): 0-0.

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In recent years, SAP system has been widely used in enterprises, especially in the integration with multiple peripheral systems, although greatly improves the efficiency, but with the long-term operation of the system, increase the amount of data, and aging equipment, the performance of the SAP system often showed a trend of decline. Adding or replacing high performance devices is often the easiest and fastest way to solve performance problems, but this approach is not only costly, but also ignores a large number of wasted system resources. This paper will analyze the SAP system optimization problems from the program, system parameters and settings, database and network hardware environment of these four angles.

Blowing method in the application of sulfur recovery unit liquid sulphur tank level measurement and practice

2017, 53(3): 0-0.

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Liquid sulfur pool process combining with sulfur recovery units, big, easy to solidification of liquid sulfur medium viscosity characteristics, this paper expounds the method of blowing level measurement of static pressure balance principle, mainly introduced the method in the installation of the liquid sulphur tank level measurement of constant pressure and constant flow, static pressure transmitter range calculation, error analysis and so on application practice, and analyzes the application of blowing the advantages and disadvantages and improving measures.

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