Table of Content

20 October 2020, Volume 56 Issue 5

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Safety and Environment Protection

Analysis of influencing factors of oil storage tank leakage and diffusion

Chang-Jing LIANG

2020, 56(5):  0-0. 

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Innovation and Practice

A typical trouble shooting method of orifice flowmeter

2020, 56(5):  0-0. 

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Orifice flowmeter is a kind of device which uses differential pressure measurement method to measure flow. It is widely used in water vapor, natural gas and other media. It is composed of throttling element (orifice), pressure pipe and differential pressure transmitter. In the process of using, medium temperature, density, distance of installing straight pipe, installation method of pressure pipe and precision of throttling element will affect orifice For the flow measurement of flowmeter, this paper summarizes the troubleshooting method, measuring principle and daily maintenance of orifice flowmeter through the fault that orifice flowmeter is inaccurate or unable to measure the steam flow caused by the impulse pipeline, which can be used for reference by the instrument technicians.

Analysis and solution of the dehydration process of triethylene glycol

2020, 56(5):  0-0. 

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Abstract: The practice of the triethyleneglycol(TEG)dehydration process in the purification company for more than 5 years has shown that the dew point of the product after the process is below -19℃for wet purified gas with a water content of about 0.09%, which meets the natural gas standard requirements. For the abnormal situation of TEG regeneration failure, (1) strictly control the liquid level of the desulfurization unit to prevent contamination of the TEG by the desulfurization solvent entering the dehydration unit caused by the incident of the tower;(2) Strictly control TEG regeneration temperature to not exceed 204 ℃ to prevent TEG degradation; (3) Strictly control the amount of stripping gas above 16m3/h. The above three measures can effectively prevent the unqualified regeneration of TEG.For abnormal conditions of TEG foaming, (1) strengthen the filtering of raw natural gas; (2) control the regeneration temperature to prevent TEG degradation; (3) prevent protecting nitrogenfrom the equipment entering the dehydration system and other measures. The above three measures can effectively prevent TEG foaming.

Problems and solutions of CEMS application in extremely cold area

2020, 56(5):  0-0. 

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CEMS, as a continuous flue gas emission monitoring device, plays an increasingly important role in environmental protection emission monitoring and process detection .With the improvement of people's environmental awareness and the increasingly strict national environmental protection laws and regulations, higher requirements are put forward for the reliability and stability of the instrument. This paper introduces the structure and measurement principle of CEMS, analyzes the problems existing in the operation of CEMS in the extremely cold region, and puts forward the solution.

Engineering Design and Standards

Analysis on the Difference of Maintenance and Inspection Standards of Fire-Fighting System at home and abroad

2020, 56(5):  0-0. 

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The imperfect maintenance of fire-fighting system is the important reason of fire and explosion accidents. Regular maintenance and inspection of fire-fighting system is the fundamental measure to improve the safety level of oil and gas station.The advanced experiences and practices of the US, European Union and Russia on fire-fighting system standards in maintenance, inspection, patrolling and exercise are introduced, such as maintenance requirements of diesel generator driven fire pumps, regular testing of pump efficiency and hydraulic characteristics of fire pumps, inspection of foundation settlement of fire water tanks, non-destructive testing of fire water tanks, and maintenance requirements of accessories for cooling water system and foam fire extinguishing system in valve, filters, central drains, start buttons. With the continuous expansion of the construction scale of oil and gas stations in China, the research results have reference significance for improving the safety protection technology level of oil and gas stations in China.

Process and Technology

The establishment of real-time simulation system based on Siemens PLC

2020, 56(5):  0-0. 

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Abstract: Nowadays, PLC has been applied to all walks of life, because PLC has the characteristics of simple programming language, good anti-interference, high reliability, so PLC is also widely used in the industrial field. However, because the simulation must be supported by hardware equipment, which often adds a lot of trouble to the relevant personnel, while the real-time simulation system based on software is seldom done at present, so this paper takes Siemens PLC and Simulink as the core, through nettoplcsim, kepserver and other software, Siemens PLC and Simulink can realize communication and data exchange, and design the man-machine interface based on WinCC, and successfully set up an online real-time simulation system.

Application of Predictive PI and Dual Control Algorithm in Heavy-duty Asphalt Production

2020, 56(5):  0-0. 

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Abstract: The temperature control of heavy-duty asphalt production is a complex industrial system with large lag and large inertia. Traditional PID control will inevitably have shocks and excessive overshoot in the heavy-duty asphalt production process, resulting in poor product quality and waste of resources. In view of the above problems, this paper puts forward the idea of controlling the temperature of the asphalt production outlet by controlling the flow rate, combining the predictive PI control algorithm and the dual control algorithm, using the dual control algorithm, using the valve opening and the motor frequency conversion power as the control means. Carry out control, use integral control to reduce the gain to weaken the effect of motor variable frequency control flow, meet the principle of sub-controller fine-tuning, and then use the predictive PI algorithm to control the deviation of the total pipeline flow and temperature to meet the requirements of process production. Through simulation test, based on the predictive PI and dual control algorithm, it can get excellent results in the production process of heavy traffic asphalt, has good stability and anti-interference, and has high use-value.

Instrument and Meter

Application and analysis of downhole monitoring technology of electric pump in heavy oil well

2020, 56(5):  0-0. 

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Applicability Analysis Of New Combustible Gas Detectors On Offshore Platforms

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The equipment and facilities on offshore oil and gas platform are compact arranged. Oil and gas pipeline runs through the whole platform. Once combustible gas leakage occurs, fair and explosion are likely to follow. The combustible gas detector is an important part of the Fire & Gas system, which should be able to monitor the combustible gas. This article first gives a brief introduction of currently used combustible gas detectors and new combustible gas detectors based on passive spectral imaging detection technology. Then compare these detectors of performance, accuracy, cost, service life, etc. Finally, we analyze the applicability of the passive spectral imaging detectors on offshore platform.

Application of TOFD technology in offshore pipeline girth welds nondestructive inspection

2020, 56(5):  0-0. 

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An TOFD-PE ultrasonic testing technology for short-distance offshore oil-gas pipeline girth welds was developed between the offshore platforms.Add a Chain link style scanner has been researched suitable for this technology.This technology resovled the blind zone of surface of the weld and fail to detect problem.The Chain link scanner is suitale many pipeline dimensions. The operation is quick and convenient.Through the technology TOFD testing can be automatized. This method is effective and reliable,and has applied in shengli offshore oid area.The technology can supply powerful guarantee for offshore pipeline girth welds.

Analysis on Crude Oil Automatic Sampling system configuration and selection

2020, 56(5):  0-0. 

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According to the importance of crude oil automatic sampling on Crude oil analysis and custody transfer measurement, together with function requirement of crude oil automatic sampling. this paper introduces the main parts of crude oil automatic sampling system. With reference to related international and national standards, this paper analysis the type and product features of crude oil sampling system. Thus providing guidance and reference to the selection of crude oil automatic sampling system on different working condition.

Intelligentization and Information Technology

Deep Application of Ultrasonic Flowmeter Diagnosis Technology in Natural Gas Metering

2020, 56(5):  0-0. 

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Natural gas sales were mainly measured by using ultrasonic flow meters, taking Daniel four-channel ultrasonic flow meter as an example, aiming at the application of ultrasonic flowmeter in the measurement of natural gas trade export, a remote diagnosis system for ultrasonic flowmeter was constructed. Through on-site examples, the analysis of remote diagnostic software was used to realize the verification method of the ultrasonic flow meter's measurement performance, gas flow state and other related diagnostic parameters. It also processes and summarizes the on-site fault diagnosis problems. The remote diagnosis system has a good effect in the field and guarantees, the smooth operation of the flow meter provides a basis for failure analysis of foreign trade measurement transfer and production processes, improves the level of measurement management, and has accumulated certain experience for natural gas measurement management.

Development and application of DCS alarm management and analysis software for hydrogenation unit

2020, 56(5):  0-0. 

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With the wide application of DCS system, the problem of DCS alarm becomes more and more prominent. The problems such as the excessive number of alarms, the increase of false alarms and the difficulty in analyzing the causes of alarms have become the difficulties and key points of alarm management in the oil refining industry. How to find out the useful alarm information quickly and accurately, analyze the causes of the alarm correctly, and take corresponding measures in time has become the top priority of the alarm management in the refining industry. In view of the above problems, this paper uses modern computer technology to design and develop a DCS alarm comprehensive management and analysis software. The software integrates the control method of expert system into it, which can not only provide clear histogram of alarm distribution for users, but also analyze the causes of alarm, and give the corresponding alarm processing measures.