Analysis and Optimization of Open Circulating Cooling Water System

Lv, Ziqiang; Cai, Jiuju; Wang, Lianyong

doi:10.3390/w10111592

Cited by 8 publications

(4 citation statements)

References 22 publications

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“…Unlike ordinary membrane treatment units, circulating cooling water systems have higher concentrations of inorganic salts, fluctuating pH, and temperature change, 32 which affect the physicochemical characteristics of NBs such as their particle size distribution, ζ-potential, and scale inhibition effect in a circulating cooling water system. Therefore, in this study, with simulated circulating cooling water as the medium, the influences of the main salts, pH value, and temperature of circulating cooling water on the particle size distribution and ζpotential of air nanobubbles (A-NBs) were investigated.…”

Section: ■ Introductionmentioning

confidence: 99%

Physicochemical Characteristics and the Scale Inhibition Effect of Air Nanobubbles (A-NBs) in a Circulating Cooling Water System

et al. 2023

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Air nanobubbles (A-NBs) in a circulating cooling water system have not been investigated, although their role is significant. In this paper, the influences of the contents of main salts and other parameters on the physicochemical characteristics and scale inhibition performance of A-NBs in circulating cooling water were investigated and the scale inhibition mechanism of A-NBs in a simulated circulating cooling water system was explored. A-NBs realized a higher scale inhibition rate of 90%, which was higher than that of 1-hydroxyethane-1,1-diphosphonic acid (40%), and A-NBs stably existed for more than 5 days in the complex water environment. Four interface functions were proposed to interpret the scale inhibition effect of A-NBs in circulating cooling water as follows. First, the negatively charged surface of A-NBs adsorbed cations (Ca 2+ ) reduced the concentration of scaling ions. Second, the negatively charged surface of A-NBs could also adsorb microcrystals, and their crystal-like seed action was conducive to the formation of large-size crystals, broke the rules of crystal growth, and reduced the adhesion of scales to the pipe wall. Third, A-NBs could also form a bubble layer after they were adsorbed on the inner surface of pipes, thereby preventing the deposition of scales on the surface. Fourth, A-NB burst caused local turbulence, increased the shear force onto the pipe surface, and reduced the scales adhering to the pipe surface. The interface effect of A-NBs in metal pipes is important in many industrial applications. This study laid the basis for the development of a new green A-NB scale-inhibiting technology.

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Section: ■ Introductionmentioning

confidence: 99%

Physicochemical Characteristics and the Scale Inhibition Effect of Air Nanobubbles (A-NBs) in a Circulating Cooling Water System

et al. 2023

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“…This needs to be done to avoid damage that can occur due to excess heat generated from the production process. In this case, the cooling process can be done using water which is called the cooling water system [2][3]. If the cooling system in the generator cannot operate it will cause, such as: (1) A sudden thermal increase in equipment will cause damage to the equipment, which can have certain financial consequences in terms of equipment fixing or replacement [1][2], (2) equipment damage can cause harm to both individuals and the environment [4], (3) the impact of the absence of cooling water, a plant can cause a blackout or unscheduled shutdown [3], [5].…”

Section: Introductionmentioning

confidence: 99%

The Maintenance Task Allocation Analysis in Steam Power Plant: Case Study on Closed Cooling Water System

Siswantoro

Priyanta

Suminta

et al. 2022

IOP Conf. Ser.: Earth Environ. Sci.

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The closed cooling system is one of the systems that functioned to ensure the cooling water supply can be continuously distributed and ensure that the production process does not cause the equipment or products to overheat, which can result in failure to the equipment and affect the production process due to downtime repair. Reliability Centered Maintenance (RCM) is one of the methods that can be used to analyze the cause of failure, impact, and determination of appropriate and effective maintenance tasks. The purpose of this research is to identify potential failures, determine the maintenance task and determine the optimal maintenance schedule in the closed cooling system of a steam power plant by using the Reliability Centered Maintenance method. The results of analysis on the closed cooling pump, heat exchanger, expansion tank, minimum flow valve, and level control valve obtained a total of 155 failure modes, of which 73% of total failure modes were identified as an evident failure and 27% identified as a hidden failure. While the results of the maintenance task recommendation obtained a total of 155 maintenance tasks which consists of 5 maintenance task categories. They are 88 (57%) of total failure modes recommended to scheduled on condition task, 38 (24%) scheduled restoration task, 20 (13%) scheduled discard task, 3 (2%) schedule finding failure, and 6 (4%) of total failure modes recommended to no scheduled maintenance.

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“…The water consumption and discharge curves of the open CCS under different conditions and the optimal operation strategy were obtained. [6] Ma et al established an experimental setup for CCS and verified the accuracy of the best measurement method under different conditions, and their research effectively improved the perceived accuracy of circulating cooling water systems. [7] Besides, in terms of local system optimization, Giro et al adopted the popular unsupervised learning algorithm to optimize the monitoring module of the pumping system.…”

Section: Introductionmentioning

confidence: 99%

Energy savings bottleneck diagnosis of cooling system based on integrated correlation analysis

Zhu

Cui

2022

Can J Chem Eng

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The circulation cooling system is an important auxiliary system in industry and has great potential for saving energy. However, a holistic energy savings retrofit of the system can cause high costs and a low input–output ratio. To address this problem, this paper integrates grey correlation analysis and partial correlation analysis to propose a new energy savings bottleneck diagnosis method for the circulating cooling system. This method deeply analyzes the operation mechanism of the industrial circulating cooling system and summarizes the main energy‐savings factor. Through the energy savings bottleneck diagnosis method based on grey correlation analysis and partial correlation analysis, the energy savings correlation coefficient and energy savings difference coefficient are calculated, and the relationship between each energy savings factor and the specific energy consumption is accurately described and quantified. Furthermore, the system energy savings bottleneck diagnosis is performed and the quantified energy savings priority of each system link is obtained. It can effectively guide the implementation of system energy savings optimization and retrofit. Finally, the effectiveness of the diagnosis method is demonstrated by simulation verification with actual network data.

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Analysis and Optimization of Open Circulating Cooling Water System

Cited by 8 publications

References 22 publications

Physicochemical Characteristics and the Scale Inhibition Effect of Air Nanobubbles (A-NBs) in a Circulating Cooling Water System

Physicochemical Characteristics and the Scale Inhibition Effect of Air Nanobubbles (A-NBs) in a Circulating Cooling Water System

The Maintenance Task Allocation Analysis in Steam Power Plant: Case Study on Closed Cooling Water System

Energy savings bottleneck diagnosis of cooling system based on integrated correlation analysis

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