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.

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.

Using Catalyst and Electrolysis Diaphragm Method to Produce Multiple Oxidants to Remove the Scaling and Slime in Cooling System

2008 ◽  
Vol 47-50 ◽  
pp. 339-342
Author(s):  
Kuo Shan Yao ◽  
Chen Yu Chang ◽  
Ta Chih Cheng ◽  
Yung Hsu Hsieh ◽  
Shi Ren Weng
Keyword(s):  
Chlorine Dioxide ◽  
High Efficiency ◽  
Ph Value ◽  
Cooling System ◽  
Water System ◽  
Cooling Water ◽  
Magnesium Carbonate ◽  
Pipeline System ◽  
Circulating Water ◽  
Multiple Oxidants

Increasing cycle of water circulation in industrial cooling water system caused accumulation of dissolving materials in circulating water. Subsequently, the problems including scaling, fouling, corrosion and slime occurred. The multiple oxidants including chlorine dioxide, ozone, peroxide hydrogen, and chlorine were prepared using diaphragm electrolysis method to alleviate the problems above in the cooling system. Meanwhile multiple oxidants can also inhibit the accumulation of biological dirt and erosion effectively. The efficiency of multiple oxidants to inhibit precipitation of magnesium carbonate and calcium carbonate can be increased by adjustment of pH value in the whole pipeline system to reduce corrosion rate of the pipeline and to achieve energy-water saving goal. The results showed that the high efficiency of chlorine dioxide mixture was an excellent bio-corrosion inhibitor and bio-accumulation bactericide. The residue concentration of mixture oxidants are at the range of 0.05 ~ 0.25 mg ClO2/L that is high enough to restrain the growth of micro-organisms.

Analog Computer Solution of a Complex Transient-Hydraulic Problem in the Power Industry

1961 ◽  
Vol 83 (3) ◽  
pp. 433-442 ◽  
Author(s):  
E. H. Taylor ◽  
A. Reisman ◽  
E. C. Deland ◽  
H. H. Baudistel
Keyword(s):  
Los Angeles ◽  
Nonlinear Differential Equations ◽  
Water System ◽  
Cooling Water ◽  
Analog Computer ◽  
Computer Solution ◽  
Steam Power ◽  
Circulating Water ◽  
Circulating Water System ◽  
The City

The Scattergood Steam Power Plant of the City of Los Angeles uses Pacific Ocean water as a heat sink. During the design of the circulating water system which conveys the ocean cooling water to the condensers, it was necessary to predict the hydraulic behavior under certain unsteady conditions in order to establish design criteria. This article describes the circulating water system, the problems to be solved, the methods of mathematical analysis, and the analog computer solution of the resulting set of 28 simultaneous nonlinear differential equations.

Experimental Research on the Effect of Cross-Wind to Wet-Cooling Tower Performance

2013 ◽  
Vol 860-863 ◽  
pp. 1412-1415
Author(s):  
Qing Yang Wang ◽  
Tian Yu Sun ◽  
Jian Zhang ◽  
Jian Xing Ren
Keyword(s):  
Wind Velocity ◽  
Flow Rate ◽  
Temperature Difference ◽  
Cooling Tower ◽  
Thermal Power ◽  
Water System ◽  
Cooling Water ◽  
Cooling Capacity ◽  
Inlet Temperature ◽  
Circulating Water

Environmental cross-wind has a influence on cooling capacity of wet cooling tower to a great extent in power plant.The variation of circulating-water temperature difference (Δt) and cooling coefficient of efficiency(η) with cross-wind velocity, circulating water inlet temperature and flow rate, are shown under cross-wind conditions, compared with cases without wind. By using experimental platform of cooling water system based on 300MW thermal power unit,it is found that with cross-wind velocity increasing,cooling temperature difference and cooling efficiency decrease first then increase at the knee point when the velocity value is 0.8m/s. In addition, the correlation betweenΔt ,η and parameters,such as circulating-water inlet temperature and flow rate, is derived for cases with windless conditions.

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