scholarly journals Foulant Characteristics Comparison in Recycling Cooling Water System Makeup by Municipal Reclaimed Water and Surface Water in Power Plant

2015 ◽  
Vol 2015 ◽  
pp. 1-8 ◽  
Author(s):  
Xu Ping ◽  
Wang Jing ◽  
Zhang Yajun ◽  
Wang Jie ◽  
Si Shuai
Keyword(s):  
Surface Water ◽  
Power Plants ◽  
Reclaimed Water ◽  
Water System ◽  
Cooling Water ◽  
Steel Corrosion ◽  
Water Shortage ◽  
Sulfate Reducing ◽  
Cooling Water System ◽  
Reducing Bacteria

Due to water shortage, municipal reclaimed water rather than surface water was replenished into recycling cooling water system in power plants in some cities in China. In order to understand the effects of the measure on carbon steel corrosion, characteristics of two kinds of foulant produced in different systems were studied in the paper. Differences between municipal reclaimed water and surface water were analyzed firstly. Then, the weight and the morphology of two kinds of foulant were compared. Moreover, other characteristics including the total number of bacteria, sulfate reducing bacteria, iron bacteria, extracellular polymeric substance (EPS), protein (PN), and polysaccharide (PS) in foulant were analyzed. Based on results, it could be concluded that microbial and corrosive risk would be increased when the system replenished by municipal reclaimed water instead of surface water.

Resistance Mechanism of Microbial Fouling in Circulating Water to Bactericide

2011 ◽  
Vol 347-353 ◽  
pp. 931-936
Author(s):  
Mo Jie Sun ◽  
Hong Dan Shi ◽  
Sheng Zheng
Keyword(s):  
Resistance Mechanism ◽  
Water System ◽  
Cooling Water ◽  
Resistance Mechanisms ◽  
Sulfate Reducing ◽  
Circulating Water ◽  
Plant Uses ◽  
Reducing Bacteria ◽  
Great Harm

Microorganisms in circulating water of power plant bring great harm to cooling water system. It not only affects the effect of heat transfer, but also would lead to corrosion of heat exchanger, in seriously would result in shutdown. Now the plant uses the bactericide to treat with the microbial fouling generally, and a variety of fungicides have been developed. However, the long-term usage of fungicide will make the bacteria appear resistance, which greatly limits the application of such measures. This paper overviewed different resistance mechanisms of Pseudomonas, sulfate-reducing bacteria, iron bacteria and slime forming bacteria in the microbial fouling to bactericide and put forward some solutions.

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.

Stator Cooling Water System Instrumentation

2015 ◽  
Author(s):  
Thomas Bauer ◽  
Mat Svoboda ◽  
Russell J. Chetwynd
Keyword(s):  
Power Plants ◽  
State Of The Art ◽  
Water System ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Copper Oxides ◽  
Low Oxygen ◽  
Proactive Approach ◽  
Cooling Water System ◽  
Efficient Heat Transfer

Large turbo- and hydro-generators are directly cooled with high purity water for efficient heat transfer from the coils. Plant operators, engineers and chemists don’t get a lot of experience with troubleshooting, as operation can be trouble free for decades. However, when a problem arises, it can happen rapidly. The reason is often plugging of the stator cooling water system (SCWS) copper hollow conductors. This can result in forced outages or major generator failures and can occur within weeks — or years — after first indication. Thus, proper instrumentation will support plants to early detect a malfunctioning cooling water system and can provide sufficient time to take effective corrective actions. The focus is on how both the SCWS and its internal instrumentation, along with enhanced monitoring techniques, can help facilitate a more proactive approach to manage corrosion effects such as hollow conductor plugging. Different basic OEM supplied instrumentation for both high- and low-oxygen systems are discussed and benefits thereof are outlined as well as “state-of-the-art” instrumentation is presented. Industry examples are demonstrating the benefit of proper instrumentation as early detection of copper oxide plugging prevented power plants from forced outages and costly rewinds. Subsequently, full cooling capacity was restored by online removal of the copper oxides.

Study on the Interaction Between Safety-Related and Non Safety-Related Items in the Component Cooling Water System Room of the Qinshan Nuclear Power Plant in the Earthquake Condition

2020 ◽  
Author(s):  
Liang Zhang ◽  
Gang Xu ◽  
Yue Wang ◽  
Li Chen ◽  
Shao Chong Zhou
Keyword(s):  
Power Plant ◽  
Nuclear Power Plant ◽  
Nuclear Power ◽  
Power Plants ◽  
Water System ◽  
Cooling Water ◽  
Life Extension ◽  
Main Body ◽  
Cooling Water System ◽  
The Impact

Abstract Safety-related items in nuclear power plants are now generally placed separately from the non-safety-related items, but it was not strictly required before. Therefore, it is very important to study whether the non-safety-related items will affect the safety-related items when they are dropped down in an earthquake situation, which determines the safety of a nuclear power plant and its future life extension applications. This research was based on the cooling water system room with the safety and non-safety related items installed together, as an example to study whether the non-safety-related items such as vent pipes and DN50 fire fighting pipes arranged above will damage the DN300 pipes and valves arranged below when earthquakes occur. For the experiments, the relative positions of objects in the room was reproduced by 1: 1. The pressure-holding performance of the pipe was used as a criterion for the damage. The research results of the experiments show that when the 10-meter-long DN50 pipe was dropped from the position of 8 meters height and the 8-meter-long vent dropped from position of 3.6 meters height, they do not affect the integrity of the DN300 valve and pipe below. After the experiment, pressure drop in two hours for the pipe is less than 0.1%. The main body of the valve does not fail neither. The numerical simulation study also shows that there is no failure phenomenon in the simulation as well. Compared with the test results, the impact acceleration and the vent deformation both have the same trend.

scholarly journals Microbiological Induced Corrosion on Brass in Recycling Cooling Water System Makeup by Reclaimed Water

2012 ◽  
Vol 03 (04) ◽  
pp. 253-258 ◽  
Author(s):  
Ping Xu ◽  
Zhaoyi Xu ◽  
Jin Wang ◽  
Yajun Zhang ◽  
Ting Liu
Keyword(s):  
Reclaimed Water ◽  
Water System ◽  
Cooling Water ◽  
Cooling Water System
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