Table of Content

20 June 2014, Volume 50 Issue 3

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Development and Commentary

WirelessHART Network Design Rules

2014, 50(3):  0-0. 

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WirelessHART process wireless system is finding wider application, users have deeper understanding about requirements of WirelessHART process wireless network design .This paper first describes the WirelessHART process wireless network design rules, and then introduces the can according to the specific condition of production field break these rules, the last list when the actual WirelessHART network can't satisfy the design rules, several measures of strengthening WirelessHART network.

Engineering Design and Standards

Study on SIL Assessment Technology of Safety Instrumented System in Methanol Installation

2014, 50(3):  0-0. 

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With large-scale methanol production unit, the unit automation level is higher and higher, the importance of SIS system to security is increasingly prominent. According to IEC61511 standard of the association of international electrotechnical , this paper introduces the SIS system safety integrity level assessment process of the chuanwei 770000 tons/year integration methanol plant,assessment results can meet the SIL rating requirement of the licenser. in the SIS system safety integrity level assessment process when introducing the process package of foreign licenser,there are some problems such as risk control, safety interlock function identification, safety interlock logic structure choice, share of DCS and SIS and independent protection Settings and so on,these issues are discussed in this paper, and proposed the corresponding solution. By summarizing the experience of SIS system quantitative assessment of methanol plant,it can be the reference for implementation of quantitative evaluation of the SIS level of SIS system in the engineering design stage.

The integration of management and control engineering design for petrochemical enterprises

2014, 50(3):  0-0. 

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The integration of management and control has been widely used in petrochemical enterprises. In recent years, the design and construction of new large-scale petrochemical enterprises are carried out in accordance with the integration of management and control model. Production process control of the old petrochemical enterprises is still dispersed, although they have carried out the information reconstruction. The importance of the integration of management and control in the old petrochemical enterprises is described. Combined with the integration of management and control renovation project in Yanshan petrochemical factory six, elaborated the steps and problems needed to pay attention in the integration of management and control renovation project.

The Research on Cable Penetration Design of Control Room and Field Auxiliary Room

2014, 50(3):  0-0. 

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No matter which way to cable entry of control room and field auxiliary room, the selection and design of cable entrance seal mode needs to be taken seriously by designer.It relates to safety, construction, maintenance, investment, etc. Analyzed common mode about cable seal & inlet wire of the control room and field auxiliary room , combined with engineering practices, it expounds the several problems and suggestions that should be paid attention to in the design of sealing method.

Analysis and Strategy to the Problem that Fuse on Radar Level Transmitter Power Loop Melt offen due to Lightning

2014, 50(3):  0-0. 

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In the refinery tank units,there is a problem that fuses on radar level transmitter power loop melt offen due to lightning.By means of analysis and simulation test ,found the reason of the problem:the gasdischarge tubes used in SPD appear flow current.After comparing the SPD with other selected SPD and simulation test ,put forword a solution of selecting suitable SPD. Changing SPDs in some refinery tank units and simulation test prove that the solution is reasonable and efficient.

Process Control Technology

Application of advanced process control in the gas fractionation unit

2014, 50(3):  0-0. 

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The successful application of DMC plus on gas fractionation unit Luoyang Petrochemical Co. is introduced. Refiner is a multi-variable, strong coupling of complex objects,it is difficult to carry out effective control in big disturbance and multi constraint conditions,difficult to effectively guarantee the production process requirements for product quality and yield control. Order to further improve the gas separation unit anti-interference ability and stable rate of key process parameters,under the precondition of ensuring the unit safe and stable,setting five control，online optimization of depropanizer、dethanizer、propylene rectification tower(A/B)、propylene rectification tower(C/D) and deisobutanizer operation, the controllers are independent, and have certain inner connection. From an overall consideration, Through the material balance and energy balance in two aspects, together to ensure stable operation of production.Through bettering the basic control, building optimal control interface and comprehensive security strategy .It is not only improved stability of unit operation and product quality,but also increased propylene yield,reduced energy consumption ,relieve the labor intensity of operators。

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2014, 50(3):  0-0. 

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Information Technology

Application of SPI Software in Integrated Auto-control Design

2014, 50(3):  0-0. 

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SPI is a professional software of SPE for Auto-control Design. The design based on database and computer network, can transfer data seamlessly between different professions throughout the project. This paper introduces the data interface in integrated system and the design process of SPI. Combined with the actual project, SPI is used for Auto-control Design with the development of reporter-output software called SADs. The project shows that the design greatly improves the quality and efficiency.

The other thinking of communication between different kinds of contral systems

2014, 50(3):  0-0. 

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sometimes,there is a need of communication between different kinds of contral systems. In the past, this kind of communication can be achieved by the way of modbus in most cases. In this Article, I will introduce the way of establishing communication by the way of profibus (if the two communicating parties have profibus interface) while the analysis of similarities and differences of the modbus communication and the profibus communication. Besides, there are two instances that can help you to understand this communication. At the end of the article, we can get the conclusion that profibus can be another way to establish communication between different kinds of contral systems and this way is reliable, simple and economic.

Instrument and Meter

Application of Gas Ultrasonic Flow Meter In Natural Gas Industry

2014, 50(3):  0-0. 

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In the measurement process of natural gas trade, As an important parameter, the accuracy of flow measurement determines transportation quality, costs and earnings. To ensure that buyer and seller get good economic interests, flow meter should have high precision, low energy consumption and low maintenance excellent features. Gas ultrasonic flow meter has been first used on natural gas inlet pipe in 30×104Nm3/d LNG(Liquefied Natural Gas) project of Hengtai CO., LTD, Bayinnaoer city. This article will combine the author's design experience to share with you the principle and application of gas ultrasonic flow meter.

SOLA Ⅱ total sulfur analyzer in the application of the catalytic gasoline hydrogenation desulfurization device

2014, 50(3):  0-0. 

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Thermo Fisher’ S SOLA II Sulfur On-Line Analyzer runs long term and gives stable analysis stability, accuracy measurement by the perfect system integration, - which the sample is conditioned to meet the requirement of analyzer. At the same time, the Sample Recovery System (SRS) is a good plan to fulfill the object of safety, environment, no pollution and saving energy. The total solution gives guide for the process to control the total sulfur concentration less than 10ppm to produce the National V gasoline; and help the gasoline hydrotraing & desulfuration plant the first start-up successful. This success lays a stable foundation for other application field.

Application of the Open Channel Flowmeter in PTA Sewage Treatment Plant

2014, 50(3):  0-0. 

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Abstract：In the sewage treatment plant, because of the advantage of non-contact and open channel, it is often used to measure the flow of sewage or other water conservancy project. But in actual measurement, it often appears measurement errors caused by measuring weir trough processing and improper instrument installation, the downstream of the sewage treatment effect. This paper briefly introduces the principle of measurement and the attention in application.

Innovation and Pratice

The Use of The Water Analytical Instrument On Line in Pollution Source Discharging Place of Petrochemical Plants

2014, 50(3):  0-0. 

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With the development of the environmental protection industry, many countries have taken some suddenly environment pollution domination. The detailed dominations are different due to the different pollutant and the various national conditions. The effective step of pollution domination is to build pollution early warning system. We install water analytical instrument in the important pollution source discharging place to analyse the cod,ammonia nitrogen and the hydrocarbon in water for 24 ours every day ,and send the data to monitor room. In monitor room we can examine the situation of the pollution place and judge the trend of the pollutant. It is the effective way to prevent the suddenly environment pollution by building the pollution early warning system and the installation of water analytical instrument on line which can reflect the resolution of the business to build a civilized society and a better world.

Oil and gas gathering and transportation automation and control systems Lightning Protection Design

2014, 50(3):  0-0. 

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With the rapid development of the petroleum, chemical industry and microelectronics technology to LSI components as the core of an information system has been widely used in oil and gas gathering and transportation engineering construction. How to do mine work,especially in the mountains lightning protection has been plagued of our problems. a combination of oil and gas gathering and transportation engineering lightning ground reality, external lightning protection measures taken by air terminals, down conductors, grounding devices, and shielding isolation, and other potential connections, set a safe distance from other internal lightning protection measures for critical electronic circuit device over-voltage protection. Through statistical analysis of power, communications, SCADA and RTU system-related data, such as self-control, made some improvements and suggestions.

Sulfur Acid Gas Combustion Furnace Thermocouple Failure Analysis and Improvement Measures

2014, 50(3):  0-0. 

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Analysis of the difficulties of sulfur acid gas combustion furnace temperature measurement, and from the aspects of high temperature, thermal shock resistance, high temperature corrosion of thermocouple failure reasons, puts forward improvement measures.