Table of Content

20 August 2016, Volume 52 Issue 4

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Development and Commentary

An Review on New Technology of Fixed Fire-Fighting System for Large Scale Tanks

2016, 52(4):  0-0. 

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Based on the necessity of China oil strategy reserves and the development trend of large-scale tank, tanks safety risk level increased. Some in-service tanks fire-fighting system can not meet the requirements of specification, such as tank fixed fire-fighting system can not deal with tank full scale fire, and the low foam supply strength and cooling water supply strength, and lack of diesel fire pump tank farm which not satisfy double loop power supply. The paper introduced the present status and application scope of foreign new foam fire extinguishing technology, including base injection foam extinguishing system, and vehicle fire-fighting facilities, and CFITM system, and TANK GUARD system, and SEF system. Finally, the suggestion to improve reliability and emergency support capacity of tank fixed fire-fighting system was made, including application of floating edge foam fire-fighting system, and foam supply strength no less than 4L/（min?m2）, and cooling water supply time no less than 15h, and equipment of diesel fire pump with diesel storage capacity no less than 6h.

Engineering Design and Standards

Reliability analysis system based on common cause failures

2016, 52(4):  0-0. 

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This paper introduces the definition of common cause failure and the common cause failure "beta" mode. It describes the common cause failure impact on the reliability of the system. It put forward the measures to reduce and eliminate the common cause failure through a typical case analysis .

Design and Study of the Instrument Air System on Offshore Platform

2016, 52(4):  0-0. 

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Pneumatic instruments have the advantage of simple structure, stable and reliable action, safety and explosion-proof .etc, so they are widely applied on offshore platforms which have many requirements on safety. The design method of air compressors used on typical platforms is analyzed, meanwhile the handing progress of instrument air and composition of air compressor system is detailed introduced. Combined with the design project of one offshore platform in Bohai Bay, the calculation method of the total consumption of the instrument air in the offshore platform is described and summarized in detail.

Selecting Sensor of Safety Instrumented System

2016, 52(4):  0-0. 

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With the improvement of social development level and the competition between companies, The state and society and enterprise itself are more and more strict to the requirement of industrial safety. In the process sector and offshore industry, the more and more safety instrumented system are adopted to ensure the production and faciltiy safety. This article describe the methods of selecting sensor for Safety Instrumented System to meet the requirment of facility risk reducation as per IEC 61511.

Brief Introduction on temperature pressure compensation calculation of differential pressure flowmeter

2016, 52(4):  0-0. 

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Gas and steam flow measurement due to the influence of temperature pressure and there is a certain error.For the flow measurement data are accurate, need to correct the temperature pressure compensation. This paper introduces the commonly used in the chemical plant of differential pressure flowmeter in gas and steam flow measurement of temperature pressure compensation method. First, this paper introduces the measurement principle of differential pressure flowmeter. Second, the gas and steam temperature pressure compensation technology and formula were discussed, then analyze the different practical method of temperature pressure compensation, and the use of the example explained the related formula. Finally, put forward the engineering problem of temperature pressure compensation need to pay attention to in practice.

Process Control Technology

Application of the Fuzzy-PID Algorithm in Temperature Process

2016, 52(4):  0-0. 

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A fuzzy-PID algorithm was inserted in configuration software to control a heating furnace by IPC and I/O cards. Temperature process always results with inertia and lag, so a fuzzy-PID algorithm was used to obtain a better result. Some fuzzy rules were applied to correct the parameters of PID online. The experiment was done on MCGS, which VB software and COM technology was used to develop the fuzzy PID module, and applied it on the temperature control of a heating furnace. The experiment results showed that the fuzzy-PID algorithm has better performance on overshoot and setting time.

The Application of Chaos Particle Swarm Optimization Algorithm in Tuning Methods of PID Paramete

2016, 52(4):  0-0. 

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In view of the short which existed in the traditional PID parameter tuning methods and intelligent PID parameter tuning methods,the PSO combined with chaos theory, proposed chaos particle swarm optimization algorithms based on Logistic mapping , and applies the algorithm in the optimization and tuning of PID parameter .The results show that the algorithm can obtain good setting effect and astringent properties, which verifies the feasibility and superiority of the algorithm.

Instrument control design of emergency blow-down system in Fischer-Tropsch synthesis （FTS）

2016, 52(4):  0-0. 

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The Fischer-tropsch synthesis reaction always contained the flammable and explosive gas and reacted in high temperature and high pressure process conditions. In such situation, safety is very important for overall reaction process. In consideration of the importance of safety, emergency blow-down system shall be used as a safeguard. In order to reduce the process pressure or release and shutdown the reaction during emergency scenario of the over temperature or lower level of reboiler, the emergency blow-down system is necessary and shall be started accordingly. This paper to introduce theemergency blow-down system control scheme of Fischer-tropsch synthesis reaction as well as its measurement element, control system and valve selection.

The brief Analysis of Process Control Method for Cracking furnace

2016, 52(4):  0-0. 

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Cracking furnace is the key of the ethylene plant equipment. The purpose of setting control method for the operation stability of the cracking furnace. Through analyzing reason of setting control method at process unit of furnace. Come to a conclusion , The key point of the cracking furnace control is COT control. In order to improve the control of details and solve some problems for cracking furnace control system.This paper introduces the depth control method of cracking furnace and fuel gas heat intelligent control method. Finally Improvement measures of process control method for cracking furnace are proposed.

Instrument and Meter

Pressure Loss and Energy efficiency analysis in the steam flow measurement

2016, 52(4):  0-0. 

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Reference mentioned that nozzle has only 30%~50% pressure loss of what orifice has, with same flow and same diameter ratio. And therefore made conclusion that an orifice consume energy up to several hundred thousand of RMB within a year. It seems that orifices have double pressure loss than nozzles. We analyze and calculate the above argument by international standard and national standard. And find that orifices have less pressure loss than nozzle, at the same flow rate, same working conditions and same differential pressure upper limit. Under these conditions, the assumption which has same diameter ratio is not valid. The article also analyzes energy consumption saving by reducing pressure loss can’t convert into economic benefits from the perspective of system. The article analyzes difference between orifice and nozzle in straight pipe requirements, exceed limits, throttling device deformation, wear resistance, economy and uncertainty.

Development and Application of Online Pluggable Support for Detector

2016, 52(4):  0-0. 

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Introduces the content of development for online pluggable support for detector; Focuses on discussing in detail the key technologies of the online pluggable support for detector and calculation method for related process technology.

The Application and Troubleshooting of Radar Level Gauge

2016, 52(4):  0-0. 

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The guidelines for choosing, installing and troubleshooting of radar level gauge is presented. Taking practical application aspects into consideration, analyzed the non-contacting and guided wave installation, compared the antennas and frequency of non-contacting radar, probes for guided wave radar. Recommendations for the construction of stilling wells are stated. It also introduced the typical troubleshooting methods especially via the echo curve and electronic suppression of false echoes.

The Application of External Liquid Level Switch in the Butanol and Octanol Tank

2016, 52(4):  0-0. 

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Abstract: This paper briefly describes the measuring principle and characteristics of the external liquid level switch, and introduces the installation method according to the actual conditions on site，which has a certain significance of application. Keywords: external liquid level switch，butanol and octanol tank，frequency conversion ultrasonic technology

Innovation and Pratice

Improvement and application of water supply system of constant pressure oil sands

2016, 52(4):  0-0. 

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Using PLC and frequency converter on the transformation of the constant pressure water supply system, water supply pipe network pressure transmitter pressure signals are transmitted to the PLC, the input value is compared with the set value, PID regulation change the output frequency of a frequency converter, control the flow of water supply pump unit, so as to achieve the water supply pipe network of constant pressure water supply.

Analysis of the application for esp multi-parameter sensor in daqing oil field

2016, 52(4):  0-0. 

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Downhole esp multi-parameter detection system is an economic and reliable in use, to monitor and control system, can reflect the production situation of oil well. To help managers control the dynamic production in time. Of downhole equipment at the same time the various parameters of the statistics and analysis in order to avoid the damage of the equipment and result in affect production, guarantee of oilfield production, reduce the cost efficiency has very important significance. Independent development of the downhole esp multi-parameter sensors can detect including multiple parameters such as temperature, pressure, vibration, and has been applied to three oil production company, effect is obvious.

Dalaoba gas gathering and processing station three-phase separator automatically adjusts the level of the oil phase Design and Research

2016, 52(4):  0-0. 

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Aimed at the effect that the gas treatment station with a three-phase separator does not adjust automatically,relying on automated instruments for the control of the core, we make a suggestion about the design and research of dalaoba gas treatment station with a three-phase separator oil level Automatic adjustment. Article analyzes the hidden problem that dalaoba gas gathering processing station three-phase separator level does not adjust automatically, and describes the implementation level automatic control function.

Intelligent control technology research and application of PSA hydrogen plant in our factory

2016, 52(4):  0-0. 

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Through the analysis of hydrogen production process, the design variable pressure adsorption process of automatic control scheme and application Foxboro company I/A Series Series of automation control system software, the design of complex control program, realize the sequence control, through the practical application, has obtained the good returns, the system runs stably

The present situation and countermeasure analysis of Refinery instrument “three rates”

2016, 52(4):  0-0. 

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From oil refining chemical enterprise instrument "three rates" statistics method, the influence factors of inducing and summarizing improve the countermeasures of "three rates" through a series of measures to improve the level of our "three rates", for the safety of the production equipment running smoothly to provide reliable technical support.