Simulation of Indoor Environment Monitor Calibration Gas Mantle Based on FLUENT

2012 ◽  
Vol 472-475 ◽  
pp. 2217-2222
Author(s):  
Sui Jun Yang ◽  
Jia Ying Song ◽  
De Xin Hou ◽  
Shu Liang Ye
Keyword(s):  
Indoor Environment ◽  
Measurement Accuracy ◽  
Concentration Change ◽  
Calibration System ◽  
Calibration Process ◽  
Gas Concentration ◽  
Fluent Software ◽  
Sensor Measurement ◽  
Calibration Gas ◽  
Standard Gas

The concentration error of standard gas in different locations of calibration system will have different degrees of impact on accuracy of calibration results. Among them, concentration of standard gas in gas mantle that combine detection sensors and gas transmission pipelines show the greatest impact on calibration results. In order to realize monitoring and analysis of the overall calibration process, this paper simulated gas concentration change status during calibration process of indoor environmental monitor gas mantle by FLUENT software. Gas concentration change status and sensor measurement accuracy at situations of different size sensors placed in the same gas mantle at the same location and same sensor placed in the same gas mantle at different location were analysed. Simulation results show that to make gas most quickly and evenly filled gas mantle, gas mantle size should be slightly larger than sensor and sensor should be placed in the top of the mantle as far as possible. On this condition, it can ensure gas concentrations error range between sensor workface and the inlet are within ±2%, thereby ensuring the accuracy of calibration results.

Study on Intelligent Controller Design of Flow Metrological Calibration System

2020 ◽  
Author(s):  
Xiong Yin ◽  
Kai Wen ◽  
Yan Wu ◽  
Lei Zhou ◽  
Jing Gong
Keyword(s):  
Neural Network ◽  
Natural Gas ◽  
Pid Controller ◽  
Controller Design ◽  
Calibration System ◽  
Calibration Process ◽  
Intelligent Controller ◽  
Flow Adjustment ◽  
Precise Adjustment ◽  
Valve Opening

Abstract In recent years, China ramped up imports of natural gas to satisfy the growing demand, which has increased the number of trade meters. Natural gas flowmeters need to be calibrated regularly at calibration stations to ensure their accuracy. Nowadays, the flow metrological calibration process is done by the operator manually in China, which is easy to be affected by personnel experience and proficiency. China is vigorously developing industry 4.0 and AI(artificial intelligence) technologies. In order to improve the calibration efficiency, a design scheme of intelligent controller for flow metrological calibration system is first proposed in this paper. The intelligent controller can replace the operator for process switching and flow adjustment. First, the controller selects the standard flowmeter according to the type of the calibrated flowmeter, and switches the calibration process. To accurately control the calibration flow for 180 seconds, the controller continuously adjusts the regulating valve with a sequence of commands to the actuator. These commands are generated by intelligent algorithm which is predefined in the controller. Process switching is operated automatically according to flowmeter calibration specifications. In order to reach the required flow point quickly, the flow adjustment is divided into two steps: preliminary adjustment and precise adjustment. For preliminary adjustment, a BP neural network will be built first using the field historical data and simulation results. This neural network describes the relationship between the valve-opening scheme and the calibration flow. Therefore, it could give a calibration flow as close as possible to the expected value during calibration. For precise adjustment, an adaptive PID controller is used. It could adjust the valve opening degree automatically to make sure the flow deviation meet the calibration requirements. Since the PID controller is a self-adaptive PID controller, the process of adjustment is very quick, which can reduce the calibration time largely. After each calibration, both the original neural network and the adaptive function of the controller will be updated to achieve the self-growth. With the information of the calibrated flowmeter, the entire calibration system can run automatically. The experiment in a calibration station shows that the intelligent controller can control the deviation of the flow value within 5% during 4∼5 minutes.

Numerical Simulation on the Influence of Flammable Gas Concentration on Explosion Peak Pressure

2014 ◽  
Vol 1010-1012 ◽  
pp. 1531-1534
Author(s):  
Xiao Feng Ma
Keyword(s):  
Numerical Simulation ◽  
Peak Pressure ◽  
Gas Concentration ◽  
Explosion Pressure ◽  
Flammable Gas ◽  
Explosion Overpressure ◽  
Fluent Software

This paper simulates the alternation of the maximum explosion overpressure on the different condition of the concentration based on the fluent software. The results show the maximum explosion overpressure increases in the earlier stage and then decreases in the later stage because of the different flammable gas concentration: the maximum explosion overpressure enhanced in 6% gas concentration and drops in 12% gas concentration; it augments in 6% gas concentration and drops in 12% gas concentration with the joining of the hydrogen; the explosion pressure peaked just at the 9% concentration of the flammable gas.

An Automatic Calibration System for Multimeter Based on Fluke MET/CAL

2014 ◽  
Vol 644-650 ◽  
pp. 1303-1306
Author(s):  
Nuo Li ◽  
Guo Ding Liang ◽  
Li Yang ◽  
Yun Peng Ji ◽  
Song Yang Li
Keyword(s):  
Special Needs ◽  
Basic Principle ◽  
Design Method ◽  
Automatic Calibration ◽  
Calibration System ◽  
Manual Operation ◽  
Calibration Process ◽  
Test Points

The calibration process of a digital Multi-meter (DMM) is complicated and tedious. The whole procedure needs to calibrate dozens of test points of several measuring ranges. Usually, the automatic calibration system is used to replace the manual operation. In metrology, the MAT/CAL which is a software produced by Fluke company has been widely used, but it can’t meet our special needs. This article is mainly on the introduction of design method of an automatic calibration system for DMM basing on Fluke MAT/CAL. It describes the setup of hardware, the improvement of ACC file in MAT/CAL and the basic principle of our software.

scholarly journals Research on Natural Gas Pipeline Leakage and Ventilation Scheme in Tunnel

2017 ◽  
Author(s):  
Hongfang Lu ◽  
Kun Huang ◽  
Lingdi Fu ◽  
Zhihao Zhang ◽  
Shijuan Wu ◽  
...  
Keyword(s):  
Repair Process ◽  
Gas Pipeline ◽  
Gas Concentration ◽  
Natural Gas Pipeline ◽  
Tunnel Section ◽  
Fluent Software ◽  
Computational Fluid Dynamics Cfd ◽  
Discharge Gas ◽  
Poor Ventilation ◽  
Ventilation Scheme

Due to poor ventilation conditions in the tunnel, if gas pipeline leaks, the consequence of the accident will be more serious. Therefore, before the emergency repair, gas in the tunnel needs to be excharged so as not to explode during the repair process. Therefore, it is necessary to study the ventilation of gas in the tunnel. Based on the computational fluid dynamics (CFD) theory and taking the Yanyingshan tunnel section of China-Myanmar pipeline as an example, this paper uses Fluent software to establish the leakage model of the gas pipeline and fan model in the tunnel and analyzes the influence of different fan locations and number of fans on gas concentration. It can be concluded that: (1) the use of press-in method makes it more efficient to discharge gas out of the tunnel. (2) In order to make ventilation efficient, the fan should be arranged in a higher position and needs to be at a distance from the top of the tunnel. (3) Parallel use of two fans has better ventilation effect than single fan.

Assesment of Indoor Radon Gas Concentration Change of College

2017 ◽  
Vol 40 (1) ◽  
pp. 127-134 ◽  
Author(s):  
Hoon-Hee Park ◽  
◽  
Euihwan Jeong ◽  
Hak-Jae Kim ◽  
Juyoung Lee ◽  
...  
Keyword(s):  
Indoor Radon ◽  
Concentration Change ◽  
Gas Concentration ◽  
Radon Gas

2A1-L13 Development of a gait analysis system : Measurement accuracy in indoor environment

2009 ◽  
Vol 2009 (0) ◽  
pp. _2A1-L13_1-_2A1-L13_2 ◽  
Author(s):  
Mariko NOMURA ◽  
Yu KUMASAKA ◽  
Kazuya KAWAMURA ◽  
Jun OKAMOTO ◽  
Hajime KENMOTSU ◽  
...  
Keyword(s):  
Gait Analysis ◽  
Indoor Environment ◽  
Measurement Accuracy ◽  
Analysis System

Improved Angiographic Measurement Accuracy with a New Calibration System

2000 ◽  
Vol 13 (3) ◽  
pp. 187-190
Author(s):  
BJÖRN SÖDERBERG ◽  
LASZLO SOLYMAR ◽  
PETER ERIKSSON ◽  
HÅKAN BOSTRÖM
Keyword(s):  
Measurement Accuracy ◽  
Calibration System

PM10 Measurement and Analysis of Urban Public Spaces Indoor Environment

2014 ◽  
Vol 1065-1069 ◽  
pp. 3177-3181
Author(s):  
Hong Ying Tan ◽  
De Zhong Zheng ◽  
Lei Lei Ma ◽  
Yu Jing Chu
Keyword(s):  
Indoor Environment ◽  
Measurement Data ◽  
Concentration Change ◽  
Public Places ◽  
Pm10 And Pm2.5 ◽  
Measurement And Analysis ◽  
Standard Value ◽  
Data Statistics ◽  
Outdoor Pm10 ◽  
Pm2.5 Concentration

The content of PM10 and PM2.5 in public places can harm to human health. Conduct the PM10 measurement in three public places of Qinhuangdao Kindergarten, Office Building and College Classroom. According to the measurement data statistics, analysis the influencing factors of indoor environmental pollution. The results showed three conclusions. First, the indoor PM10 concentrations influenced by the indoor whether heating or not. The PM10 concentration change ratio is 1.12~ 1.663, and the PM2.5 concentration change ratio is 1.29~2.1. Secondly, in the fog haze weather, indoor PM10 concentrations linear associated with outdoor PM10 concentrations; in the sunny day, there was no obvious correlation with the outdoor PM10 concentrations. Finally, contrast the standard drawn up by domestic and foreign relevant organizations and authorities, in the fog haze weather, indoor PM10 and PM2.5 concentrations below China standard value, but higher than USA, Europe, Japan standard value.

Sign in / Sign up

Export Citation Format

Share Document