Adaptive Control of Steam Generator Feed-Water System Based on Improved Single Neuron Self-Adaptive Control

2016 ◽  
Author(s):  
He Li ◽  
Cheng Fangquan ◽  
Wang Dongqin ◽  
Xu Jiangtao
Keyword(s):  
Adaptive Control ◽  
Steam Generator ◽  
Single Neuron ◽  
Water System ◽  
Feed Water ◽  
Self Adaptive

Stress and Fatigue Analysis Considering Thermal Stratification With the THERMAXS Code

2009 ◽  
Author(s):  
Adama Diaby ◽  
Michel De Smet
Keyword(s):  
Stress Intensity ◽  
Steam Generator ◽  
Thermal Stratification ◽  
Water System ◽  
Computer Code ◽  
Fatigue Analysis ◽  
Feed Water ◽  
Steam Generators ◽  
Thermal Ratcheting ◽  
Division 1

This paper describes the stress and fatigue analysis of the feed water nozzles of the replacement steam generators of the Doel 2 NPP in Belgium. In the framework of the steam generators replacement, thermal stratification transients were considered in the stress and fatigue analyses of the feed water system components such as the feed water lines, their reactor building penetrations and the steam generator feed water nozzles. To do so, long term external wall temperature measurement have been performed on one feed water line of Doel 2 between the steam generator replacement in 2004 and December 2007. From those measurements a number of typical stratification phenomena were identified. For each phenomenon, a design stratification transient and its number of occurrences were derived from the measurements. A fatigue analysis and primary+secondary stress intensity analysis of the feed water nozzles of the Doel 2 NPP was performed taking into account the presence of the design thermal stratification transients in the feed water lines and feed water nozzles. The fatigue analysis was performed according to the rules of the ASME Boiler & Pressure Vessel Code, Section III, Division 1 – Subsection NB-3200 using the in-house developed computer code THERMAXS that is capable of dealing with measured stratification transients. For the analysis, one may finally conclude that the fatigue, P+Q stress intensity range and thermal ratcheting criteria are respected throughout the 40 years of plant life.

Effect of Process Factors on Pervaporation Dehydration of Isopropanol

2017 ◽  
Vol 68 (6) ◽  
pp. 1302-1305
Author(s):  
Ali A. A. Al Janabi ◽  
Oana Cristina Parvulescu ◽  
Bogdan Trica ◽  
Tanase Dobre
Keyword(s):  
Ceramic Membrane ◽  
Membrane Surface ◽  
Water System ◽  
Surface Model ◽  
Feed Water ◽  
Mixture Flow ◽  
Water Separation ◽  
Membrane Area ◽  
Operation Temperature ◽  
Process Factors

The paper aimed at studying the performances of pervaporation separation of isopropanol-water system using a Pervatech ceramic membrane at various values of feed mixture flow rate (F=1000 kg/hr), feed water mass fraction (xF=0.1-0.2), operation temperature (t=60-90 �C), permeate pressure (pP=1000-9000 Pa) and water separation degree (sW=0.9, 0.95). Membrane total flux and separation factor were predicted applying a second order response surface model with 3 factors, i.e., xF, t and pP. An algorithm for estimating the membrane surface area was presented. Membrane area increased with sW and xF and its lowest values (A=13 m2 for xF=0.1 and A=24 m2 for xF=0.2) were attained for t=60 �C and pP=9000 Pa. These findings could be applied for optimizing the process of isopropanol dehydration by pervaporation.

scholarly journals Study on the Variable-Temperature Drying Process of Corn Drying in an Industrial Corn-Drying System Equipped with a Self-Adaptive Control Heat Exchanger

2021 ◽  
Vol 11 (6) ◽  
pp. 2772
Author(s):  
Bin Li ◽  
Zhiheng Zeng ◽  
Xuefeng Zhang ◽  
Ye Zhang
Keyword(s):  
Adaptive Control ◽  
Energy Consumption ◽  
Heat Loss ◽  
Thermal Performance ◽  
Variable Temperature ◽  
The Other ◽  
Drying Process ◽  
Drying Kinetic ◽  
Drying System ◽  
Self Adaptive

To realize energy-saving and efficient industrial grain drying, the present work studied the variable-temperature drying process of corn drying in a novel industrial corn-drying system with a heat recycling and self-adaptive control function. The drying kinetics, thermal performance, heat-loss characteristics and the heat-recycling performance of the drying system under different allocations between flue gas and hot air were investigated, and the optimized drying process was proposed and compared with two constant drying processes. The results showed that the optimized drying process exhibited better drying kinetic and thermal performance than the two constant drying processes. More specifically, the total heat loss, total energy consumption and specific energy consumption of the optimized drying process were ascertained to be 36,132.85 MJ, 48,803.99 MJ and 7290.27 kJ/kg, respectively, which were lower than those of the other two processes. On the other hand, the thermal efficiency of the drying chamber for the optimized drying process was ascertained to be varied within the range of 6.81–41.71%. Overall, the validation results showed that the optimized drying process can significantly improve the drying performance of the drying system.

A modular hybrid DC circuit breaker with fault current self-adaptive control and protection coordination

2022 ◽  
Vol 134 ◽  
pp. 107434
Author(s):  
Shimin Xue ◽  
Baibing Liu ◽  
Shouxiang Wang ◽  
Xiao Chen ◽  
Xiaoshuai Zhu ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Circuit Breaker ◽  
Fault Current ◽  
Dc Circuit Breaker ◽  
Self Adaptive

300 mm-Travel Stage of Grating Ruling Engine and Its Self-Adaptive Control Method

2014 ◽  
Vol 41 (6) ◽  
pp. 0608001
Author(s):  
李晓天 Li Xiaotian ◽  
于海利 Yu Haili ◽  
齐向东 Qi Xiangdong ◽  
朱继伟 Zhu Jiwei ◽  
于宏柱 Yu Hongzhu ◽  
...  
Keyword(s):  
Adaptive Control ◽  
Control Method ◽  
Self Adaptive
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