Table of Content

20 April 2014, Volume 50 Issue 2

Previous Issue    Next Issue

Development and Commentary

Quantitative Reliability Evaluating for DCS

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

Reliability has been the important index for DCS (Distributed Control System). A safe and reliable control system can reduce unexpected shutdown during normal processing, improve production quality, lower maintenance cost and reduce investment risk. It shall be considered how to evaluate and improve reliability of DCS during system design. As a subject for science, reliability engineering has developed many analysis technologies, which is helpful to find system status when elements are failure. How to evaluate and analyze DCS reliability by the method of quantitative analysis is mainly introduced in this article.

Engineering Design and Standards

Design and application of CCR optimization control system based on expert system

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

In this paper, CCR process is the research object, through expert control system by means of natural gas found in current production conversion rate is not high, steam waste more on issues such as treatment and improvement, effectively reducing the overall energy consumption of the production unit, CCR current problems for the proposed solutions and implementation case.

The study of energy saving control on feeding between refinery process units

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

This study introduces the control flow of feeding between traditional refinery process units and analyzes the cause of the waste of energy. Then, it introduces the control flow of feeding between process units in a new type of refinery. It elaborates the control plan which not only saves energy, but also guarantees the safe and stable operation of process units

The advantages of integration differential pressure flow meter and the implementation

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

According the standard, the primary device, transmitter and accessories in the process installed in a short pipe segment and calibrated on one supplier, that is composed an integration differential pressure flow meter. It can minimize installation errors and reduce the installation shedule, the system accuracy can also be improved. The advantages of integration differential pressure flow meter is discussed in the paper, the key points and the implement is also analyzed.

Design of portable PID parameters self-tuning Controller based on ARM

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

PID control is the most widely used control strategy in the industrial process control. Generally, tuning of PID is accomplished by experienced engineer. The whole process is not easy to achieve. It is time and energy consuming due to system difference, delay and nonlinear problems. Therefore, self-tuning of PID parameters is proposed in the paper. In order to optimize the system, the following steps will be done as follows，monitoring the dynamic performance of the industrial process, obtaining the main performance parameters of system, calculating PID parameters automatically according to the empirical formula, inputting PID parameters to PID controller.

abcccc

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

acb

abc

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

abcddee

APPLICATION OF SOFT SENSOR IN HYDROCRACKING

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

The hydrocracking technology is the important composition of refine oil engineering.Mastering the real time’s quality index of each product is advantageous to the improving of yield and energy effect.The soft sensor is to make use of measurable parameter, adopt the nonlinear dynamic state pattern to realize observation computing, and according to actual process, combine regression statistical method, calculated unmeasured variable.The soft sensor is propitious to real time operation and contrroling of advance control for operators, reduce the feedback time of assay data, raised product quality and response time.

Information Technology

Design and implementation of Tianjin Branch Company of real-time database system

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

This paper outlines the company real time database (RTDB) system structure and function design of the system, summarizes the system after putting into effect.

The research and practice of communication on intelligent instrument & DCS at Petrochemical storage tank

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

the paper introduces DCS and Honeywell ENRAF servo liquidometer, Emerson SAAB radar level gauge, Hebei zhufeng optical level gauge ZYG - 101 - a/ZYG - 601 equipment such as Modbus RTU and RS - 232 communication protocol, and discusses XP248 communication module and Modbus RTU and the RS - 232 communication protocol connection method and application.Practice proved XP248 communication module and other third-party intelligent instrument equipment communication is stable and reliable, high precision data accurate, is worth popularization and application.

Instrument and Meter

A New Desalter Interface Optimize and Control System

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

Abstract：An ID200 interface detector and an OW300 online water-cut monitor is described based on the principle of microwave energy absorption, is a new way to optimize and control the oil-water interface of desalter. Elaborating its working principle and structure, to improve the stability of desalter operation and function, increase the handling capacity of the device.

Brief Analysis of the application of air blowing liquid level gauge in sulfur pond

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

According to character of the liquid sulfur pond, this article briefly discussed radar level gauge measuring principle, characteristics and application disadvantages in liquid sulfur pond, briefly discussed the principle of air blowing liquid level gauge and the successful application and promotion in liquid level measuring in liquid sulfur pond, and discussed the strengths and weaknesses of this type of liquid level gauge..

Online MS in the petroleum and chemical industry applications

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

This paper describes a mass spectrometry quantitative analysis, Detailed description of the principle of data processing, and monitoring applications in industrial processes. Taking into account the industrial process control is continuous and stable, high-precision analysis, the paper focuses on the sampling system and sample analysis methods,to fully exploit mass spectrometry quantitative analysis of real-time,fast, accurate, multi-stream, multi-component analysis of the characteristics.

accc

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

As smart integrated temperature transmitter has its own excellent characteristics, it is widely used in engineering design, but the end users have different views on that. The main problem is that the signal zero drift of integrated temperature transmitter would be severe and the error increases when the transmitter is exposed to harsh environments, which will cause a lots of instrumentation maintenance. This paper analyzes the influence of environmental temperature on the accuracy of intelligent integrated temperature transmitter, calculates an error of the transmitter due to the change of the environmental temperature, and put forward the selection principle of temperature transmitter.

Innovation and Pratice

Claim attention matter of temperature measure system by thermal resistance

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

Author has simply Introduced thermal resistance temperature element has analyzed the principle of platinum thermal resistance measure system, has illustrated the error volue in table caused by lead resistance difference by means of table. Has explained how to avoid the bad effect of lead resistance difference upon temperature measure

Design and Implementation for PLC Based on the RSView32

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

This paper introduced the method of netting for AB PLC controllers, taking water treating devices for an example. The new PLC controller was netted with the original PLC system by OPC services, provided by RSLinx software. The two PLC control system communicated with host computers by EtherNet/IP network. The host computers software was made by RSView32, which was improved. The control system was revamped successfully, without increasing the operator stations and suspending work.

Transformation of oil filling system of compressor cylinder gas injection

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

This paper mainly expounds the cause compressor gas injection stop without oil flo and before and after improvement of cylinder lubricator system comparison.

The measurement of multipoint temperature in column tube reactor

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

Column tube reactor is widely used in organic chemical and fine chemical industry, its internal temperature measurement and the spatial distribution of temperature is the key parameter of the reactor. In this paper, the columns of the pipe reactor has more than 20000 tubes, need to measure the internal 72 points temperature in different location. The reaction is exothermic reaction and carried out within the explosion limit, so the temperature measurement and control is very important. In this paper, I introduce a type of thermocouple that used in the column tube reactor, with a diameter of 1.6 mm of K type thermocouple, the thermocouple root purging with nitrogen gas, and at the top of the thermocouple is fixed with the silver welding of stainless steel wire. Installation of thermocouple and catalyst loading at the same time, at the end of the catalyst loading cutting stainless steel wire, using extrusion of catalyst fixed thermocouples. Thermocouple signals transmit to 4-20 mA then sent to DCS, the signals is used to determine the concentration of the reactants, the life of the catalyst and whether the reactor is leak, etc. Through the actual test it meet the technological requirements, has a good effect.

The Flow Compensation of the Real Gases

2014, 50(2):  0-0. 

Asbtract ( )  

Related Articles | Metrics

The compensation of the temperature and pressure is used for calculating density of the ideal gases in the engineering application. It must be take into account the actual gas compression factor. The Lee-Kesler equation to calculate the actual gas compressibility factor is used in the paper, and the calculation method can be realized in the PLC. That is the reason why this method can solved the density compensation of the real gases .