Automation in Petro-Chemical Industry

Code and characteristics of the commonly used stainless steel in Instrument

2016, 52(6): 0-0.

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The choice of stainless steelmaterials is crucial in instrument of chemical plant, it should be chosen according to operation environment such as process fluid、temperature、pressure etc, and the material properties of anti-erode, hardness, machinability,weldability and cost. This article illustratescategory, component. code, physical property and applications of variousstainless steelmaterial specially used ininstrument, Keywords:erode;Austenitic grade stainless steel;ferriticgrade stainless steel;martensitic grade stainless steel;Austenitic –ferritic(duplex) grade stainless steel;precipitation hardening grade stainless steel;

Split Control

2016, 52(6): 0-0.

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The functions of split control in the engineering application are described according to the basic conception of split control, taking engineering project as example to analysis the method how to predict the split point for split control.

Engineering Design of Fine Powder and Oligomer Removal Scheme for On-line Process Analyzer Sample Handling System in Gas Phase PP Process Technology

2016, 52(6): 0-0.

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The forming principle of polypropylene fine powder and propylene oligomer in gas phase PP process technology is explained. The harm of PP fine powder and oligomer for on-line process analyzer is presented. The engineering design of PP fine powder and oligomer typical removal scheme for analyzer sample handling system is described in detail.

Instrument Selection and Design for High Hydrogen Sulfide Gas Field

2016, 52(6): 0-0.

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The hydrogen sulfide content is very high in natural gas of high hydrogen sulfide gas filed. Compare with normal gas field, the wet parts materials and model selection and design of instrument are different from high hydrogen sulfide gas filed. According to the toxic and corrosion of hydrogen sulfide, and to the sulfur deposition in natural gas, selection and installation design of pressure instrument, temperature instrument, level instrument and flow instrument for high hydrogen sulfide gas filed are introduced. With the instrument maintenance experience of Sinopec Puguang gas field and Yuanba gas field, some design attentions and suggestions of instrument selection for high hydrogen sulfide gas filed are discussed.

Optimization of automatic control of large scale compressor in chemical plant

2016, 52(6): 0-0.

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Compressor is a commonly used large equipment, Used to enhance the pressure of the process medium, to meet the synthesis and polymerization, purification, refrigeration and gas separation, gas transmission and other conditions, and then, to achieve the requirements of Engineering design . The normal operation and safety of the compressor are related to the stability and safety of the whole process. This means the compressor control and interlock protection is particularly important. How to optimize the traditional compressor control mode is the key point of this paper.

Application of Cascade-Ratio Control Strategy Used in Polyester Process Based on Density Amending

2016, 52(6): 0-0.

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In the producing of polyester, the molar ratio of EG (Ethylene Glycol) to PTA (Pure Terephthalic Acid) as a very important process parameter will change according to the compositions of these two raw materials which will cause unsteadiness of product quality. The control strategy of multiple closed loop ratio of EG to PTA is usually used to control the ratio steady. But, as to the ratio itself, this control strategy is intrinsically an open loop. A novel control which is called cascade-ratio control strategy is established in this paper, which is based on an experiential formula demonstrating the relation of the density of mixture slurry to the ratio of EG to PTA. The density of the mixture of EG and PTA serves as the master variable and the molar ratio of EG to PTA is the slave variable. The effectiveness of the control strategy and the amending model has been checked by projects.

Fault Diagnosis for Batch Fermentation Process Based on KMC-KECA

2016, 52(6): 0-0.

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Abstract: Aiming at the nonlinear, the unstable parameters of the working steam and the boundedness of traditional contribution plot method, a K-mean clustering-kernel entropy component analysis (KMC-KECA) fault diagnosis method was proposed. First mapped the data from low dimensional input space into a high dimensional feature space to achieve the nonlinear relationship between variable linear transformation.The data dimensionality reduction was conducted according to the kernel entropy eigenvalues and eigenvectors. Then a KMC kernel space contribution plot of fault diagnosis method was proposed, this method achieved fault diagnosis according reconfiguring the monitoring sample of fault times. At last, this method was applied in the fermentation process of penicillin fermentation, the results show that the proposed method has better fault diagnosis performance.

Unit dynamic simulation system ITCC-OTS development and application

2016, 52(6): 0-0.

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Design of automatic control system for wastewater treatment based on PLC

2016, 52(6): 0-0.

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This article selects Sewage treatment device as the research background on water gas plant of Petrochemical Industries.According to the treatment process and the actual operation of the sewage treatment plant,contruct a set of automatic control of PLC including fuzzy algorithm and software WINCC to realize real-time monitoring configuration and PROFIBUS-DP fieldbus and Industrial Ethernet to form network communication in the integration of sewage treatment control system. Through the software and hardware design to achieve the control requirements of sewage treatment plant. Keyword: PLC; WINCC;sewage disposal;Automatic control system

The application of PID controller of fruit fly optimization algorithm

2016, 52(6): 0-0.

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Abstract: Fruit fly optimization algorithm intelligent algorithm which can get quickly the global optimal solution is higher than traditional method in computing precision and computing speed, but also is easy to fall into local optimum. In order to effectively obtain optimal PID parameters of AVR control system, this paper proposed a new optimization algorithm—the decrease of the iteration step value of fruit fly optimization algorithm. With the improved algorithm of PID parameter online setting, the simulation results show that the improved optimization algorithm can be obtained better control performance in PID controller, and improved algorithm has certain practical value.

The development and application of Power diagram econometric analyzing system based on Andriod platform

2016, 52(6): 0-0.

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More than 5,000 pumping wells are running in the Huabei Oilfield. There are problems to the current management modes in two aspects. One is for pumping wells installed with wisdom-oilfield components, in the daily operation and maintenance, people at the well-site can’t access to the server and do data analysis or process the results, leading to well maintenance difficult and management efficiency low. The other is for non-network coverage pumping wells in remote area, we can’t make the remote digital control, the operating system can only rely on experienced artificially adjustments, lacking reasonable theoretical basis. To this end, based on Android platform, we developed a mobile power diagram econometric analyzing and querying system as well as a well-site data acquiring and analyzing system. This not only made the mobile phone a terminal which can access to the server processing results of the work area in security, but also made the mobile phone a data collecting and analyzing terminal at the well-site. The two systems had took a wide range of well-site application tests in Huabei oilfield, which dramatically lowered the labor intensity, improved the work efficiency and reduced the pumping wells’ management costs by up to 30%. The calculated production results showed the average relative error is only 5.1%, less than 10% of industry standards, which meets to the requirements of industrial applications.

Practice of data integration and application of ERP SD module

2016, 52(6): 0-0.

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In the process of implementing ERP centralization, enterprises need to realize the business data integration and application of the relevant system and ERP sales (SD) module.Through the relevant system status research, needs analysis, data flow design, organization and implementation of the problem tracking, linkage test, project acceptance and other stages, the development of the relevant system to complete the interface method set.The practical activities are related to various systems, the complex characteristics of the data model. The key to success, thanks to good project management, especially the demand analysis and process design, has a certain reference value for the related fields.

Development and Application of Permanent Magnet Brushless Direct Current Motor at Gas Station

2016, 52(6): 0-0.

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Aimed at the problems with the normal three-phase asynchronous motor used in self-priming pump, such as high failure rate, low speed range, low efficiency, only containing start and shut down, and unable to realize frequency conversion control, a type of asynchronous motor used in BLDC was developed. Field application shows that the BLDCM can realize carrying a gun at low speed and normal refueling operation at high speed, starting torque, efficiency, temperature rise, service life and other characteristics are superior to ordinary three-phase asynchronous motor. On the same operating conditions at gas stations, the BLDCM can save electricity above 30% compared with the normal three-phase asynchronous motor, the BLDCM has a broad prospect of promotion.

Design of Central Monitor&Control Console in Self Refueling Stations

2016, 52(6): 0-0.

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In recent years, self refueling station, with its high efficiency and convenient features, is widely used in our country. Compared to ordinary gas station, there are fewer staffs in the self refueling station, who often work in the convenience store. In order to ensure the safety operation of the self station, a new type central monitor and control console is developed in this paper. The CCTV, call & intercom system, broadcast system, equipment control system and emergency stop system are integrated in the new device. Thus, the staff can monitor and control all equipments of the station near the checkout counter. Using the new device can effectively improve working efficiency and security performance.

Research and application of single well automatic metering device for oil and gas separation

2016, 52(6): 0-0.

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skid mounted type oil and gas separation of single well automatic metering device, comprises a gas phase and a liquid phase separation, gas phase and liquid phase control system part, and the accompanying gas with crude oil metering, gas liquid two full separation, after the separation of the gas phase and liquid phase by a single-phase flow mass flowmeter metering. Realized single well continuous metering and detachments continuous metering, to solve the traditional measurement of discontinuity and inaccurate, for the current number of flow metering technology gaps in small flow cannot be measured, in order to meet the requirement of single well oil gas water metering accuracy + 10% of the, improve the oil well produced fluid multiphase flow in mixed phase conveying technology, to solve the remote oil well beyond measure, and accords to the demand of oil field development, the products in the field of promotion more than 10 sets, measuring method is simple and reliable performance.

AAA

2016, 52(6): 0-0.

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Discuss of thermowell resonance applicable conditions

2016, 52(6): 0-0.

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Abstract：Calculate the natural frequency and the pressures stress of the typical thermowell in this paper，according to the calculation，we can know which condition needs pay attention to the calculation of the thermowell particularly，avoid the accident caused by thermowell, then give some advices about the design of the thermowell。

Electromagnetic valve terminals of ASCO G3 technology application in power plant water treatment and experience

GenLai Zhou

2016, 52(6): 0-0.

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Cause analysis and solution of the high amplitude fluctuation of the reactor temperature in full density polyethylene unit

2016, 52(6): 0-0.

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In view of the problem of the high amplitude fluctuation of the reactor temperature after the upgrading of the DCS system in Maoming ethylene full density polyethylene unit，the principle of control configuration execution in DCS system is analyzed，find out the executive order error of the control modules、 the functional blocks in the control module is the cause of the control fluctuations.The methods for solving these problems are proposed and good results are obtained.

Petrochemical tank farm lightning induction protective instrument system

2016, 52(6): 0-0.

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Abstract：Petrochemical industry informatization, automation degree is high, the continuous and reliable work of the control system and equipment safety is very important.Using a large number of high precision electronic equipment, automation instrument system overvoltage tolerance ability is poor, vulnerable to lightning induction effect and even damaged.In this paper, in combination with the practical situation of lightning protection standards, basic theory, the scene, from the external and internal lightning protection instrument system, the essay discusses several aspects, in order to prevent or reduce the instrument system by the lightning damage, increase the system operation safety.

GE coal slurry gasifier safety interlock optimization

2016, 52(6): 0-0.

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During the gasifier safety interlock debugging, multiple simulations extreme tests and found several times valve malfunction phenomenon in the original design logic, there are security risks, avoid potential risks, optimization logic design, safety interlock conditions increasing portion, improve security.

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