Table of Content

20 August 2014, Volume 50 Issue 4

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Development and Commentary

The APC and RTO Development Technology of Ethylene Cracker Based on NIR

Jing-Cheng Yang

2014, 50(4):  0-0. 

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This paper mainly introduces advanced process control and real-time optimization technology development, research and application of characteristic of cracker in ethylene based on online NIR analysis of ethylene .NIR Analyzer configuration requirements and functions is described in detail. APC and RTO implementation of typical control schemes in cracking furnace are described in detail. The operation interface of the program is explained. It is described the requirements of oil POINA model. Finally,It is introduced each external conditions which the APC control is need.

Engineering Design and Standards

Researches on the Design of SIS Loop

2014, 50(4):  0-0. 

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Abstract：Based on GB/T 20438-2006, GB/T 21109-2007 and the practice of the design of Safety Instrument System (SIS), this paper introduces the related concept of SIS design and discusses the means of the design and verification of SIS. This paper then makes a comparison among several SIS loop, and offers some suggestion on improving SIS.

The Apply of SmartPlant 3D in Instrument Design

2014, 50(4):  0-0. 

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With the traditional design, AutoCAD software is the main tool for cabling layout drawings, which just could describe the cable layout path roughly. Using SmartPlant 3D software, all equipments could be located accurately, so the cable path is more actual. Besides, the cable model contains more data that make the design more efficient. After modeling, we could get material bill of cable, cable tray, cable conduit, which are more accurate and applied. The advantage of this design method has been tested and verified.

Discussion on Type Selection and Calculation of Black Water Control Valve

2014, 50(4):  0-0. 

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Recent years, coal chemical industry developed rapidly, GE coal slurry gasification process was applied widely. Black water control valve is one kind of critical valves of this process. The fluid of black water control valve is highly corrosive, and contains some hard solid particles. Flashing will occur because of high differential pressure between inlet and outlet of black water control valve, and the fluid of outlet will be high-speed vapor-liquid-solid three phase flow. So, black water control valve is in completely severe service. If type selection or calculation of black water control valve is not suitable, then the process requirements can 't be met and stable running of gasification plant will be affected. This paper briefly introduces GE coal slurry gasification process and working condition, type selection, calculation, special requirements of black water control valve based on a project of coal to hydrogen.

Application of SPI Software in Management of Instrument Loop Package and Loop Test in Saudi Arabia Large Petrochemical Project

2014, 50(4):  0-0. 

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The content and management procedures of instrument loop package is expounded ， the basic functions of SPI（Smartplant Instrumentation） software and application in the management of instrument loop package is analysed . Combined with construction procedure of large petrochemical EPC contracting projects which our company have implemented in Saudi Arabia over the years, the article describes in details the new management methods of instrument control engineering under the IPMT management mode, and management process, content, key points, etc. of the instrument loop package management and loop test based on the SPI software,

Process Control Technology

Research on ensembling method for Modular Neural Network

wenbo liu

2014, 50(4):  0-0. 

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In order to solve the problem of modular neural network (MNN) ensemble. This paper integrated the ideas of “divide and conquer” and “put the heads together”, and proposed a measure of selecting sub-nets on-line. For a given input, this method calculated the distance of the input and the center of sub-nets firstly, and then constructed the fuzzy member degree based on distance measurement, finally realized on-line sub-nets selection by fuzzy judgement. The number of sub-nets varied to different inputs. This made the MNN’s self-adapting ability be stronger. It ensembled multi sub-nets by linear method. The weights of sub-nets were optimized by reconstructing the sample space and dynamic programming. The simulation results suggest that this method can improve the precision and generalization ability effectively.

Pump Recovery Wells Dynamic Management System Based on ASP.NET Technology

2014, 50(4):  0-0. 

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Abstract: In order to achieve the data management informatization and business process automation of pump recovery wells, a pump recovery wells dynamic management system based on ASP.NET technology is designed, the whole design and the related function modules of the system are given. According to the main function of the system, the system is divided into dynamic management, approval feature and measures management modules. A visual representation is provided by OWC server controls, the pump recovery wells classification statistical figures are generated. Combining with C # language, the real-time query, automatic statistics, abnormal remind and export printing functions of the data are realized. In accordance with the business process, the workflow drive model is established, the approval plans are reported and the business flow is realized. After the approval, the data of measures such as parameter regulation, fracturing, water plugging, overhaul is recorded, the effect of the measures is compared and analyzed. As is shown in actual application, the integration, sharing and display of the information are realized, the business process is optimized and the work efficiency is improved in the system.

PI controller and decoupler based on feedforward strategy for ball mill

2014, 50(4):  0-0. 

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Abstract:The ball mill object has got some problems such as multi-input-multi-output, strong coupling, large time delay.This paper presents a new multivariable decoupling PI control strategy. First, a decoupler is proposed to achieve complete decoupling. Second, a model reduction method is obtained with a target for the first-order plus dead time model(FOPDT). Based on the simplified model, a feedforward compensator is applied to the process and this article offers a easy parameter tuning PI controller. In order to demonstrate the performance of the proposed method it is applied to a ball mill model, the results show that the new strategy is superior to the general method in the following aspects:set-point following performance, model reduction, complete decoupling.

The remote service system for coal gasification plant based on VPN and DLP

2014, 50(4):  0-0. 

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In recent years, with the fast development of information network and industrial control technology, remote monitor technology is gradually becoming a research focus. The remote service system has been widely used in various walks of life, and has achieved good efficiency. According to the remote monitor needs of data information of coal chemical industry, the remote service system based on VPN and DLP, using field control network, enterprise internal network and internet, connects measurement equipments and control systems distributed in the country, realizes remote information interaction and exhibition of the control equipments, completes the tasks of remote service.

Information Technology

The application of Aspen in the large petrochemical enterprises

2014, 50(4):  0-0. 

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The structure and function of the Aspen were introduced, combined with the use of the software in petrochemical process, pointing out the direction of the software, to provide a method for data acquisition in actual production process.

WIRELESS MONITORING TECHNOLOGY OPTIMIZATION OF SINGLE WELL ON SULIGE GAS FIELD

2014, 50(4):  0-0. 

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In order to build a modern large gas field, ChangQing Oil Field has carried out digital management vigorously on SuLiGe Gas Field. For the digital management, wireless monitoring technology of single well not only is a basic technology but also is a key technology, because the level of the technology will directly affect the degree of digital construction on Sulige Gas Field. In this paper, on basis of the basic principles of single-well wireless monitoring technology, the process that the technology was improved and optimized is introduced in detail: The Changes from only collecting well-head data to wireless-colleting and transmitting wellhead photo to real-time transmitting wellhead video dynamically, can better adapt to the requirements of digital management of SuLiGe Gas Field, and truly implemented electronic-inspecting well; at the same time, the remote-control-switch-well technology has been realized and stepped up, that promoted the management transition of SuLiGe Gas Field, and played a significant effect in some areas such as improving the management level, streamlining the organization, enhancing the work efficiency, reduce the operating costs, protecting the grassland environment and so on.

三维应急系统在油库安全管理中的应用

2014, 50(4):  0-0. 

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The system for petroleum and petrochemical storage tank factory and surrounding environment of virtual reality simulation, highlighting major hazard plants, other devices have greater risk, facilities, plant protection equipment, plants, buildings, plant road and weather conditions and other factors; realization of base map data, emergency resource data, major hazard data and other related attribute data management, to provide information WEB inquiry; dimensional simulation using virtual reality simulation technology to achieve significant hazards surrounding environment shows forecast the scope of the accident, as well as secondary accidents that may occur while using artificial intelligence and spatial analysis techniques to achieve optimal path analysis and the best rescue plan, the implementation of remote emergency decision-making should provide assistance and support decision-making.

Instrument and Meter

Automatic monitoring system for tilt of floating roof of floating roof tank

2014, 50(4):  0-0. 

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Articles from floating roof tanks to improve automated operation surveillance proposed the establishment of floating roof tilt monitoring system, run the monitoring stage of the floating roof tanks, mainly through artificial periodic observation and video-assisted observation manner, not only labor-intensive manual can not be found in time tilt the top of the float. After creating floating roof tilt monitoring system, pressure changes the floating roof of fiber optic pressure sensor detects pressure in the system, remote analysis and calculation first bit machine by setting time to time to monitor the state of the floating roof, floating roof tilt reached when outliers timely given alarm or automatically stop into the oil. After floating roof tilt monitoring system established to reduce labor intensity and improve the level of automation to run floating roof tanks.

Application of On-line Oxygen Analyzer in PTA Plant

2014, 50(4):  0-0. 

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The oxygen concentration in the off-gas of oxidation reaction is the important parameter to reflect safe, stable and efficient production of PTA plant. According to the component, corrosive characteristics and the requirement of process, this article introduces the application of on-line oxygen analyzer in PTA plant from the aspects of measuring principle of magneto-dynamic oxygen analyzer, designing of sample handling system, attentions when used on site and analysis of measuring error. Emphasized the matters need attention while selecting and using the magneto-dynamic oxygen analyzer. Proper selection and application of on-line analyzer are suggested.

Innovation and Pratice

Interlock shut-off valve actuator air regulator fail deal with countermeasures no downtime

jinshan cai

2014, 50(4):  0-0. 

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This article discusses the petrochemical aromatics processing unit ,PX feed line air regulatro of interlock valve smashed crack because the construction. process of the formation of stable production of paraxylene plant huge security risk, instrumentation air line filter is mounted on the actuators of interlock valve, because the larger diameter valves DN300, Vice-line valve is not installed, the valve handle can not be removed. Field monitoring showed that the filter valve smashed crack gradually expanding. If not promptly treated, may cause the unit unplanned downtime, according to the interlock shut-off valve actuator and the drawings of pneumatic components, combined with a detailed analysis of the solenoid valve operation principle, found the unit does not downtime online processing methods. After the actual simulation drills and other similar valves, confirms the reliability of the methods, the successful resolution of the problem, avoiding unplanned downtime unit. Interlock shut-off valve fault for similar treatment, with reference.

Guided wave radar level meter in the steam drum level measurement of new practices

2014, 50(4):  0-0. 

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Abstract：Guided wave radar level gauge with GPC compared with ordinary guided wave radar, which is not high temperature, high pressure, steam mixture, density, bubbling / boiling, the effects of different dielectric constant and viscosity, vapor automatically with real-time compensation technology to ensure accurate measurement of drum level at high temperature and pressure conditions. Article describes in detail the kind of level gauge working principle and characteristics, installation requirements and application in drum level measurement.

Air separation 9.8MPa Steam pipe network vent valve technical reform

2014, 50(4):  0-0. 

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Abstract: For air separation 9.8MPa steam pipe network vent valve, at the stage of using, it often occur surge and leak problem, Through the analysis of the internal structure of the valve、Analysis of high temperature and high pressure steam flow、Analysis of gas pipeline operation principle、Analysis of material hardening、The manufacturing process of key parts and components、The sealing surface and the guide surface hardening treatment process，we have achieved the true reason about valve surge and leak problem, through structure and manufacture reform, remake the key parts, reinstall and adjust, now good operation, realize the motion stability and zero leakage requirements, and achieved very good results.

The Discussion on Asked Questions Of Construction Central Control Room

2014, 50(4):  0-0. 

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Petrochemical enterprises in toward large-scale, integrated, intelligent direction change, Requirements of production automation, information management, production management and process control management and control integration, construction intelligent factory, Put forward higher request to the control room.This paper Introduces the construction situation of Maoming petrochemical refinery plant central control room, The work of relocation control system operation station period of Device during the overhaul , Discussion project experience on design and construction process.