Table of Content

20 February 2020, Volume 56 Issue 1

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Development and Commentary

Brief introduction of in-line inspection technology

Chang-Jing LIANG

2020, 56(1):  0-0. 

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Engineering Design and Standards

Development of Instrument Installation Drawing Design and Automat-ic Material Collection Based on AVEVA Instrumentation

2020, 56(1):  0-0. 

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A method is presented based on AI(AVEVA Instrumentation) Design module for instrument installation drawing generation and automatic material collection. This proposed method is able to solve the problem of inconsistent installation and cumbersome statistics of installation materials under the traditional design mode. The core of this development is to build a typical instrument installation drawing library and installation material library, which are stored as seek bank in the SQL database for engineering designers to use. The development can quickly generate instrument installation drawing by calling customized database, also can accurately count installation materials on the basis of completed instrument installation material report. Project practice proves that the development significantly improves the design efficiency and accuracy.

Research on Power Supply Reliability Design of Station Control System for Natural Gas Transmission station

2020, 56(1):  0-0. 

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The station control system(SCS) of the gas transmission station of the long natural gas pipeline plays the role of collecting, adjusting and scheduling process parameters to ensure the gas transmission to the downstream users, and is also responsible for the safety interlock control and emergency shutdown function;SCS is the core of the realization of the automatic control function of the whole station.In recent years, abnormal shutdown problems caused by power supply failure of the control system occur frequently, resulting in interruption of gas supply, which may even cause significant economic losses to downstream users and affect the reputation of pipeline companies.This article discusses the reason of failure of control system supply from the power supply, UPS, power supply circuit configuration, equipment selection and suggests the means including the dual power supply, UPS selection, STS, improve power supply reliability design approaches such as load grading configuration, and the PLC system, the operation station and server gives the recommended way of power supply, through the above configuration can make the gas station yard control system of the power supply reliability will be greatly improved.

Process and Technology

Video Monitoring System for Heating Furnace Based on Machine Vision Technology

2020, 56(1):  0-0. 

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Earlier, the reheating furnace relied on personnel experience to judge the combustion situation in the furnace, which increased the intensity and danger of work. In order to solve this problem, the video monitoring system of reheating furnace based on machine vision technology is used to make up for the deficiency. Firstly, the working principle, software and hardware of the system are introduced. Then, the key technology realization of video surveillance system is elaborated in detail. After running for a period of time, the system can meet the requirements.

Interlock Protection and Start or Stop Procedure for Motor Driven Compressor

2020, 56(1):  0-0. 

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Interlock protection and start or stop procedure are the core technology for compressor control strategy. The process flow of compressor is introduced briefly combining with engineering project in which compressor device is driven by motor. The interlock protection and start or stop procedure for compressor are expounded in detail . It aims to provide reference control strategy for similar compressor device.

Safety and Environment Protection

Design and Research of Subsea Pipeline Leakage Monitoring System

2020, 56(1):  0-0. 

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China has laid out ten thousands kilometers of subsea pipelines, but these subsea pipelines have not achieved online real-time leakage monitoring. Once leakage happened, it will not only cause offshore platform stop production, but also cause marine environment pollution and long-term incalculable damage to the ecological environment. Therefore, it is practical to study the method suitable for subsea pipeline leakage monitoring. This article introduces the principle of the pipeline leakage monitoring system in detail, and also provides guidance for subsequent subsea pipeline monitoring.

Intelligentization and Information Technology

Conventional Terminal and FSRU floating gasification shipInformation sharing in the central control system

2020, 56(1):  0-0. 

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The Tianjin floating LNG project is constructed in two phases, with the FSRU mode in the first phase and the conventional terminal mode in the second phase. The FSRU used in the first phase of the project is a relatively independent process unit. As the central control system of the LNG terminal, it is necessary to consider the effective connection of the first and second phases, and also be compatible with the data information and pipeline SCADA data on the FSRU. The entire central control system needs to be scalable, information sharing, and data compatible. It is a new challenge of this project to realize the function of mutual transmission of technology data and interlocking of safety interlocking between FSRU control system and LNG terminal control system through ship-shore connection system.

Application of On-line Chromatographic Data Sharing in Natural Gas Measurement

2020, 56(1):  0-0. 

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In this paper,a method that the real-time data of on-line chromatographic is distributed and shared to the fixed stations without chromatographic analyzer in long-distance natural gas pipeline is proposed. The project is based on SDH optical fiber communication network or DDN communication network for SCADA system of long-distance pipeline, and protocol conversion server with read-write function was set up in the control center. After the application of this method in Yuji pipeline’gas transmission station of ultrasonic measurement, The fluctuation range of the Sound Velocity Verification deviation rate for ultrasonic flowmeter is effectively reduced to 33% of the original one, which effectively improves the accuracy of measurement. Secondly, the working principle of gas chromatographic instrument and its application in gas transmission station are introduced.（3Figures，4Figures，2References）

Instrument and Meter

Application and Evaluation of Thermoconductive Hydrogen Analyzer In Scott's hydrogenation process

2020, 56(1):  0-0. 

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The exhaust gas treatment in Puguang gas field natural gas purification plant uses the hydrogenation reduction absorption process,and the water content during normal operating conditions reaches 6 %, and the water content during the pre-vulcanization operation can reach 40 %. The pre-treatment system using the thermal conduction hydrogen analyzer is now simple. It can not satisfy the demand of the measuring device for the content of vapor. In order to improve the removal rate of water vapor in the sample gas, it is proposed to upgrade the sample gas pretreatment system and adopt dynamic reflux device + primary filtration + tertiary water removal + primary desulfurization and drying. Combined with thermal conductivity and infrared measurement of carbon dioxide content technology, an accurate measurement of the analytical instrument is achieved.

Development and Application of Automatic Metering Device for Crude Oil Tank Lift

2020, 56(1):  0-0. 

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Aiming at the difficult problem of precise measurement of liquid level in crude oil storage tank, especially the difficulty of precise measurement of oil-water interface position in tank, an automatic measurement device of oil storage tank elevator is developed, which is mainly composed of automatic elevator, measuring orifice tube, radio frequency liquid level water content analyzer and detection probe. The problems of accurate measurement of liquid level and oil-water interface of crude oil storage tank are solved. The automatic and accurate measurement of liquid level and oil-water interface of crude oil storage tank, alarm of liquid level exceeding limit, and measurement of water cut in layers are realized.

DEVELOPMENT AND APPLICATION OF A NEW MULI-PIPELINE UTRASONIC FLOW METER SYSTEM

2020, 56(1):  0-0. 

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Abstract: The ultrasonic flow meter has obvious advantages in measurement accuracy, reliability, pressure loss, range ratio and daily maintenance，compared with other types of flow meters，which has become the first choice for high-pressure and large-flow natural gas metering. The accuracy of natural gas measurement directly affects the fairness of trade settlement. A new type of modular splicing and skid mounted technology of Multi-pipeline ultrasonic flow meter measuring skid is provided，which improves welding quality and installation accuracy of front and rear straight section around ultrasonic flow meter through factory prefabrication, and ensures the upstream gas source is more easily mixed and the fluid medium in the ultrasonic flow meter is more uniform by inlet flow and diversion mode of inlet manifold, which makes the data of on-line chromatographic analysis cabin more representative, and it is helpful to improve the accuracy of commodity trade measurement; the process design of multi-pipeline comparison can realize the function of mutual comparison and alternation of ultrasonic flow meters，which provides reference for the application of ultrasonic flow measurement system in natural gas trade transfer measurement.

Application of Domestic Online Raman Analyzer in Sinopec Aromatics Process Unit

2020, 56(1):  0-0. 

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The online Raman analyzer for the adsorption separation unit in the aromatics process has important guidance for the operation and process analysis of the unit. The Raman spectrum analyzers used in domestic aromatics process are foreign products. After Sinopec has a large-scale aromatics complex process technology with independent intellectual property rights, it needs a domestic Raman spectrum analyzer suitable for this process (simulated moving bed adsorption process - SorPX). Through research, development and testing, the partners of the project established a quantitative analysis model based on the functional relationship between the characteristic peaks of the mixed components and their contents, and developed a new domestic online Raman analyzer, which were put into operation in September 2019. Successfully applied in the second aromatics complex of SorPX in Sinopec Hainan Refining & Chemical Co., Ltd, which promoted the improvement and promotion of Sinopec's aromatics process technology.

Innovation and Practice

Discussion on anti - shock strategy of lubricating oil pump

2020, 56(1):  0-0. 

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According to the anti-rocking power strategy of lubricating oil pump in petrochemical plant, several specific schemes of anti-rocking power are summarized, and the advantages, disadvantages and applicable scope of each scheme are analyzed in detail. This paper discusses the problems existing in the current mainstream dual power supply configuration, restarting configuration and anti-sway contactor. Restarting configuration will easily lead to process disorder; There is no tripping hazard in the contactor, these configurations are not recommended to be used on the lubricating oil pump.

Application and fault analysis of positive pressure ventilation system of motor in compressor station

2020, 56(1):  0-0. 

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The compressor set in the compressor station of a long natural gas pipeline is driven by frequency conversion motor, and the three SINMENS compressor set motors adopt the positive pressure explosion-proof mode. This paper summarizes the explosion protection measures taken by compressor unit in motor start-up and operation, and introduces the structure principle and operation mode of positive pressure ventilation system in detail. Combined with the compressor unit shutdown caused by the positive pressure ventilation fault of the compressor station in the production process, the fault reasons of the positive pressure ventilation system were analyzed, and the rectification measures were put forward, which provided a reference for the fault treatment of the motor positive pressure ventilation system in the future

Evaluation of ratios of sulfuric to oxime Interlock in Beckmann rearrangement reaction

2020, 56(1):  0-0. 

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The reaction principle and danger of the cyclohexanone oxime Beckmann rearrangement has been summarized. The importance of ratios of sulfuric to oxime in the Beckmann rearrangement reaction is described. The ratios of sulfuric to oxime，which is a interlock parking conditions of the cyclohexanone oxime Beckmann rearrangement，has been discussed. It points out the shortcomings of the current domestic cyclohexanone oxime Beckmann rearrangement in the emergency situation, and puts forward suggestions for improvement.

Application effect of laser flammable gas detector in natural gas station

2020, 56(1):  0-0. 

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Abstract：Laser flammable gas detector is a new kind of gas leakage detection technology. The key technology is based on the principle of spectral absorption. The flammable gas can absorb the detection laser at a specific wavelength to judge whether the flammable gas leakage occurs in the target area. The flammable gas in the target area can be judged by calculating and analyzing the absorption ratio of the detection laser leakage quantity