Improving the Performance of Cooling Water Systems Using Exergy Analysis: A Novel Approach

2009 ◽  
Author(s):  
Mohammad Hassan Panjeshahi ◽  
Mona Gharaie ◽  
Lena Ahmadi
Keyword(s):  
Heat Exchanger ◽  
Exergy Analysis ◽  
Cooling Tower ◽  
Water System ◽  
Cooling Water ◽  
Water Systems ◽  
Exergy Destruction ◽  
Heat Exchanger Network ◽  
Cooling Water System ◽  
Circulating Cooling Water

Circulating cooling water systems almost serve all the operations of industrial plants where there is requirement of an external heat sink for heat removal and temperature control. Research on cooling systems focused on the energy analysis of individual components, cooling tower and heat exchanger network. However, the energy concept, alone is insufficient to describe the energy efficiency of the whole system. In this study, the exergy analysis is applied to evaluate the performance of the circulating cooling water system. To achieve this objective, the exergy destruction of the cooling tower and heat exchanger network in terms of different operational conditions are investigated. The results indicated that the exergy destruction in the cooling tower is increased by increasing the cooling tower inlet temperature; whereas the exergy destruction of the heat exchanger network decreases. Therefore, the problem of cooling water system for performance evaluation becomes an optimisation problem to search for the minimum exergetic destruction. Additionally, the second law efficiency of the cooling tower and water network is studied through the exergetic analysis.

Study on Biological Aerated Filter as Enhanced Pretreatment Process of Coagulation and Sedimentation

2013 ◽  
Vol 726-731 ◽  
pp. 1940-1944 ◽  
Author(s):  
Liang Shen ◽  
Han Xiao ◽  
Wan Qiu Yang ◽  
De Ren Miao ◽  
Xiao Ming Li
Keyword(s):  
Power Plant ◽  
Water System ◽  
Cooling Water ◽  
Ammonia Nitrogen ◽  
Secondary Effluent ◽  
Biological Aerated Filter ◽  
Sedimentation Process ◽  
Cooling Water System ◽  
Circulating Cooling Water ◽  
Aerated Filter

Using coagulation and sedimentation process in the advanced treatment of urban secondary effluent which can be recycled to circulating cooling water system in power plant is only perform well on CODCrand turbidity removal. But the concentrations of organic matter and NH3in effluent can not meet the requirements of circulating cooling water. Therefore, in this study, the feasibility of biological aerated filter (BAF) as a pretreatment enhancing coagulation and sedimentation process was discussed. Achieved by controlling the two operating modes: (1) secondary effluentcoagulation and sedimentationeffluent; (2) secondary effluent BAFcoagulation and sedimentation effluent.The results show that the BAF pretreatment removes ammonia nitrogen effectively, and the turbidity and CODCrof effluent of BAF-coagulation sedimentation process is much lower than individual coagulation and sedimentation process. The final effluent qualities meet the requirements of circulating cooling water system in power plant.

Study on Corrosion Resistance of Brass in Circulating Cooling Water with Different Concentration Ratio

2012 ◽  
Vol 511 ◽  
pp. 70-73
Author(s):  
Yu Chun Li ◽  
Xiao Wei Liu ◽  
Rui Feng Zhang ◽  
Kang Juan ◽  
Fan Gao
Keyword(s):  
Weight Loss ◽  
Corrosion Resistance ◽  
Concentration Ratio ◽  
Water System ◽  
Cooling Water ◽  
Cooling Water System ◽  
Circulating Cooling Water ◽  
Weight Loss Method ◽  
Ratio Condition ◽  
Loss Method

Abstract: The corrosion resistance of brass H70-1A cooling water was studied through weight-loss method and electrochemistry measurement in different concentration ratio condition. The results obtained from this study showed that brass inhibitor was necessary to add to circulating cooling water system when concentration ratio was in the range of 3~7.

Research and Discussion on Electro-Magnetic Treatment in Circulating Cooling Water of Power Plant

2013 ◽  
Vol 732-733 ◽  
pp. 382-386
Author(s):  
Ni Zhang Xiao ◽  
Nan Zhang Xiao ◽  
Long Wu Wen ◽  
Rui Ju Zhao ◽  
Chun Lei Zhang
Keyword(s):  
Power Plant ◽  
Chemical Treatment ◽  
Power Plants ◽  
Water System ◽  
Cooling Water ◽  
Magnetic Treatment ◽  
Treatment Technology ◽  
Cooling Water System ◽  
Circulating Cooling Water ◽  
Electro Magnetic

The effects of anti-scale, anti-corrosion and disinfection of circulating cooling water with electro-magnetic treatment and chemical treatment in the laboratory are compared. The applications of electro-magnetic treatment in power plants are summarized and discussed. The results of both experiments and applications in power plants show that the electro-magnetic treatment can be used in particular conditions, but the development of electro-magnetic treatment technology is immature. This technology used in circulating cooling water system in power plants should be further proved by more experiments and field applications.

scholarly journals Microbial Population Structure In Circulating Cooling Water System Makeup By Municipal Reclaimed Water

2001 ◽  
Vol 71 (3) ◽  
pp. 565-579
Author(s):  
Huanhuan Huang ◽  
Ping Xu ◽  
Jie Wang ◽  
Changzheng Wang
Keyword(s):  
Population Structure ◽  
Microbial Population ◽  
Reclaimed Water ◽  
Water System ◽  
Cooling Water ◽  
Corrosion Mechanism ◽  
Network Systems ◽  
Chemical Agents ◽  
Cooling Water System ◽  
Circulating Cooling Water

The municipal reclaimed water, which often reused in circulating cooling water system, can effectively alleviate the urban water crisis. However, the reclaimed water contains a large number of microorganisms while the water environment in circulating cooling water system allows the micro-organisms to further increase. Therefore, circulating cooling water system faces slime, corrosion and other microbial problems. In this work, the microbial population structure of circulating cooling water makeup by municipal reclaimed water was investigated by using modern molecular biology DNA technology. Our results demonstrated that at the level of family, there were 17 kinds of suspended microorganisms in municipal reclaimed water, in which the dominant strain belonged to Proteobacteria, Betaproteobacteria, Methylophilales, Methylophilaceae. For the circulating cooling water without chemical agents, 13 kinds of suspended bacterias and 36 kinds of immobilized bacteria were detected, in which the dominant strain respectively was Comamonadaceae and Pseudomonadaceae which belonging to Proteobacteria Betaproteobacteria. After adding chemical agents, the number of suspended bacteria increased to 26 kinds and the distribution of bacteria species was even more. And the dominant strain become Staphylococcaceae, which belonged to Firmicutes, Bacilli, Bacillales, the reason for this was the sharply increase of TOC and TP after adding scale and corrosion inhibitors. Corrosion of instrumentation and pipe network systems caused by microorganisms is particularly complicated in circulating cooling water systems and even in whole reclaimed water utilization systems. The corrosion mechanism and corrosion process caused by different microorganisms are different. Therefore, it is very important to explore the composition of microorganisms in reclaimed water to study the corrosion of microorganisms. Based on the study of microbial population structure in municipal reclaimed water, this paper explores the microbial population structure and dominant species in the water in response to the specific situation in which reclaimed water is reused in the circulating cooling water system. At the same time, it also provides some research suggestions for the future research on the corrosion caused by microorganisms in the reuse of recycled water.

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