Automation in Petro-Chemical Industry

An Review on the Status of Outside Detection Technology for China Long Distance Pipeline

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

Coating damage in the construction of new pipeline, and the corrosion defect in the in-service pipeline will adversely affect the safety of pipeline. The pipeline outside detection can find coating defect in time and guide the repair and maintenance of pipeline. The paper expounded the working contents of outside detection of long distance pipeline. From the aspect of pipeline coating detection technology, the advantages and disadvantages and applicability of more mature and advanced outside detection technology were introduced, such as the standard pipe/ground voltage detection technology ( P/S) ，Pearson detection technology，pipeline current mapping technology，the direct-current voltage gradient( DCVG) method，and the close interval potential method( CIPS)．In addition, it also included the non-excavation external detection technology. The application and practical experience of outside detection technology in pipeline engineering in China were systematically summarized, and the main problems in application are analyzed. Finally, the future development trend of pipeline outside detection technology was prospected.

Study on the Design Scheme of Safety Instrument System for in-service Tank

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

In petrochemical projects, the storage medium in tank area is complex and there are many poisonous media, but the instrumentation in tank area is relatively simple. Many tank groups do not have safety instrumentation system. Once an accident occurs, the hazard is enormous. According to the requirements of the General Administration of Safety Supervision, it is imperative to reform the safety instrument system in the tank farm in service. Aiming at the problems often encountered in the process of reformation of safety instrument system in tank farm in service, considering the factors of high efficiency, economy, reliability and practicability, this paper puts forward the design scheme of reformation of safety instrument system in tank farm in service, and expounds in detail the key links of safety instrument selection and configuration and Instrument certification. The scheme has been successfully applied to a domestic tank safety instrumentation system renovation project, which has a good reference significance.

Research of Combined Integral Control System of Voltage Swing in Electroslag Remelting Process

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

Electroslag remelting is a process with large inertia and hysteresis, which results in the unsatisfied control effect of traditional constant power control and PID algorithm. Hence, A voltage swing control strategy is proposed based on the combined integral controller. Firstly, the hydraulic drive system used for electrode feeding is simplified to an integrating plus pure hysteresis process. Secondly, a standard deviation calculating model is established based on the combined integral process in order to reflect the voltage swing of the furnace port. Next, a double combined integral controller was designed for the electrode feeding process. Finally, the least square procedure is used to identify a combined integrating process from the Generalized control plant consists of electroslag feeding and voltage swing calculation process. Besides a combined integral master controller is designed for the model to form a cascade control system. Compared with the conventional PID controller, the controller has better control effect and has certain value.

Prediction PI algorithm is developed and applied in temperature control experiment

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

The B&R temperature experimental apparatus has the characteristics of large time delay, non-linear and parameter time-varying that are difficult to be controlled. The experimental method was used to obtain the mathematical model of object. Aimed at the large time delay characteristics, this paper adopted predictive PI control scheme. The corresponding predictive PI algorithm module was developed on the B&R PLC. ST language was used to program the control algorithm on AS software. The control parameter was easily tuned. Experimental results showed that this control scheme has good robustness and strong anti-interference ability, and has certain practical application value.

Parameter Identification of PMSM Based on MRAS-RLS Algorithm

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

Research on the multi - parameter online identification algorithm of PMSM. Firstly, the advantages and disadvantages of various commonly used identification algorithms are analyzed, and the existing problems of motor parameter identification methods are further studied and analyzed. Then, the advantages and disadvantages of the recursive least squares method and the model reference adaptive parameter identification algorithm are analyzed. Finally, combined with the advantages of model reference adaptive and recursive least squares, an improved recursive least squares method is designed. The simulation experiment of steady and time-varying parameter identification was carried out by the improved algorithm. The identification effect was compared with the algorithm before improvement, which showed that the identification accuracy and speed of the improved algorithm (MRAS-RLS) were improved. The MRAS-RLS algorithm combines the advantages of combining two identification algorithms. The accuracy and speed of the constant parameter identification are very high. The identification follow-up of time-varying parameters is very good, which proves that the improved algorithm is better than the unmodified identification. There are great improvements.

Automatic Control Design and Permission Control Based on AVEVA Instrumentation Intergration Platform

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

The functions and workflow of AI(AVEVA Instrumentation) are introduced for date flow of automatic instrument design in this paper. Considering the requirement of external data transfer and automatic control design, the development of base library and template library is described in detail. In addition, to solve the problem of privilege control of designers and system administrators in the intergration platform, the solution is given by grouping and distributing authority with Security Manager. Through project practice, the development improves the design efficiency and accuracy obviously.

Research on fast detection and process techniques about oil and gas fields optical cable fault

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

It is necessary to analyse and study the common cable fault type, fault cause, television technology ,in order to dealing with the oil and gas field optical cable line fault quickly. Now ,optical fiber communication is one of the main communication methods on oil and gas fields, optical cable fault affect the data transfer，which caused the production and safety out of control, so the efficient of optical cable fault handling is important. Based on the background, research is performed in cable television technology such as curvilinear analysis, manual three-step has been put forward, meanwhile real-time monitoring system has been put forward. When a cable failure occurs, operation and maintenance staff can deal with the failure quickly with the help of real-time monitoring system, which can gain information of optical cable fault quickly and accurately. The research on manual three-step and real-time monitoring system of cable fault contribute to dealing with the oil and gas field optical cable line fault quickly. The research result may be a good reference to practical application.

The structure of multipath laser gas analyzer and application in industry

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

Introduced the structure、characteristics of two difference types multipath absorption cell, description the principle of laser gas analyzer and harmonic detection method, exampled the application of multipath laser gas analyzer in trace gas analysis, discussed the application characteristics and limitations of laser gas analyzer in industry.

Using RF admittance technology to realize reliable measurement of electric desalination tank boundary position

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

Abstract: The presence of salt and water in crude oil brings considerable harm to the steady production of constant decompression and subsequent devices and the corrosion of equipment. How to accurately detect oil and water interface to ensure the timely removal of brine in crude oil, in the past a variety of traditional measurement methods have not achieved satisfactory measurement results, and maintenance difficulties. In this paper, the principle, characteristics, installation and debugging of the RF admittance level meter are introduced in detail, and its practical application in the measurement of the boundary position of the electric desalination tank.

Automatic Torch Fire Control Implementation in CENTUM Vp System

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

?By improving the automatic ignition control system of the torch system, optimizing the control plan and the control link, improving the level of automatic automatic control, and interpreting the internal logic program of the PLC ignition control instrument for the independent automatic ignition control cabinet in the operating room, the part of the on-site instrument equipment was reformed. The DCS system is used to control the torchlight to facilitate the process monitoring and data transmission. The DCS system can monitor the torch system continuously and ensure the record of the work process data.

Analysis of multi stream scheme of single stream analyzer

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

This paper mainly introduces the method of realizing multi-channel analysis by technical transformation of single-channel on-line analyzer. Combining with the practical experience of transformation, this paper gives an example of realizing multi-channel analysis by using PLC and realizing multi-channel analysis by using DCS, and provides various schemes for realizing multi-channel analysis by single-channel, thus providing the analyzer with the greatest role in practical application. Reference for peer reference.

Application of Central Control DCS System in Data Acquisition of Shipping Pump

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

The crude oil shipping pump of an offshore oil production platform undertakes the task of transporting oilfields in the whole region. It plays an important role in the process of ensuring the safe and smooth transportation of crude oil. With the increasing production of the whole oilfield group, the external pressure is bound to increase. Therefore, strengthening the monitoring and management of crude oil shipping pump has become the key to ensure the safe production and smooth transmission of the whole oilfield group. By utilizing the characteristic that Siemens S7-200PLC used by shipping pump and the Emerson Deltav System both support the Modbus communication protocol, the communication scheme of establishing Modbus master-slave protocol between S7-200 PLC and DeltaV system serial commun ication card is implemented, and the hardware and program configuration method of S7-200 PLC and Deltav system serial communication card is realized. Finally, the communication between the PLC and the central control DCS system was successfully realized, and the on-line data acquisition of the central control DCS system for shipping pump operation was completed.

Design of Automatic Feeding System for Particulate Material

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

In chemical production, plastic processing and other industries, some solid particulate materials are fed manually, which will result in high labor intensity and low efficiency of workers, and seriously affect production. It is difficult to meet the requirements of production from man, machine, material, method, surroundings and other aspects. In order to better meet the needs of production, an automatic feeding system for particulate materials was developed through practical production and related professional experience. The system consists of four main structures: storage box, electrical control system, power system and conveyor pipe. It has been applied in production practice and achieved good results.

Energy consumption test and grey correlation analysis of double pipe water and oil gathering process

Chang-Jing LIANG

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

Application of HIPPS for the flow line overpressure protection in sour oil field

2019, 55(5): 0-0.

Asbtract ( )

Related Articles | Metrics

In order to resolve the issues of flow line pipe rupture caused by in highly corrosive fluid in one of the Middle East sour oil field, the article analysis of the solution of HIPPS to protect the overpressure of flow line, and verify the structure constrains and PFDavg constrains based on IEC 61508, ISA TR84.00.02. The fault tree method is used to calculate the PFDavg of the HIPPS system, after analysis the potential failures of the system, the system can achieve SIL 3 and meet the process safety requirement; it is an economical and technical acceptable measure for the flow line overpressure protection.

Table of Content