Circulating Water Pump Modifications Performed in Conjunction With Cooling Tower Replacement During a 35-Day Outage

2010 ◽  
Author(s):  
Robert M. Morgenstern
Keyword(s):  
Cooling Tower ◽  
Water System ◽  
Cooling Water ◽  
System Capacity ◽  
Unit Load ◽  
Accelerated Corrosion ◽  
Circulating Water ◽  
Design Changes ◽  
Circulating Water System ◽  
Water Pumps

Westar Lawrence Energy Center Unit 5 in Lawrence, Kansas is a 375 mW unit that utilized a closed loop circulating water system with a wooden cooling tower and three horizontal circulating water pumps to provide cooling water to the condenser. The wooden cooling tower experienced rapid degradation over the past five years of operation. Chlorine was added to the water chemistry to reduce attack of the wooden components, but the chlorine levels in the water caused accelerated corrosion of the pump components and base plates. Circulating water system capacity was reduced due to worn pump components and excessive clearances. Unit load was limited by the lack of adequate circulating water capacity. This paper discusses the pump and motor repairs, design changes performed in parallel with demolition of the wooden cooling tower, and replacement with a new fiberglass tower designed to utilize the existing concrete basin. All of the changes were implemented during an outage in April-May 2009.

Failure of Circulating Water Pumps Discharge Header Cross Connect Valve — Optimum Solutions

2014 ◽  
Author(s):  
Mohammed Alismail
Keyword(s):  
Sea Water ◽  
Water System ◽  
Normal Operation ◽  
Problem Analysis ◽  
Circulating Water ◽  
Root Cause ◽  
Maintenance Work ◽  
Circulating Water System ◽  
Water Pumps ◽  
Cross Connect

The circulating water system is a very important system in Ghazlan Steam Power Plant- 4276 MW, as it supplies the sea water to the tubes side of the Condensers during normal operation. A large butterfly cross-connect valve was installed at the circulating water pumps discharge header to isolate the pumps and the header for maintenance. A forced unit shutdown occurred due to valve’s shafts end leakage and collapse after maintenance work. This paper explains the wrong design location of the valve in the piping as the root cause of the problem. Analysis with ASME reference will be presented. This paper will also present potential solutions and actions taken as a lesson learned to avoid occurrence in other plants.

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.

Research on Cooling Tower Fan Energy Saving Control System Based on PLC and Inverter Technology

2013 ◽  
Vol 281 ◽  
pp. 537-541
Author(s):  
Jian Ping Chen ◽  
Xiao Kuan Shi ◽  
Hai Jun Li
Keyword(s):  
Control System ◽  
Energy Saving ◽  
Energy Savings ◽  
Cooling Tower ◽  
Water System ◽  
Circulating Water ◽  
Production Practice ◽  
Characteristics Analysis ◽  
Circulating Water System ◽  
Energy Saving Control

In order to improve the effective utilization of the cooling tower fan industrial circulating water system, and to achieve the purpose of energy saving, the paper developed a closed loop cooling tower fan is jointly controlled by the PLC and inverter energy-saving control system. With the theoretical energy-saving fan characteristics analysis, PLC is used as a controller. Combined with inverter technology, remote real-time communication is carried out via RS485 bus with the host computer, and centralized monitoring to operating status of many sets of fans is realized. Production Practice has proved that under the premise of ensuring the water temperature standards, the inverter deceleration of the cooling tower fan makes significant energy savings effect.

Energy Saving Analysis and Improvement of Cooling Circulating Water System in M199 Technological Process

2017 ◽  
Author(s):  
Zhixiang Xiong ◽  
Yin Luo
Keyword(s):  
Energy Consumption ◽  
Water Supply ◽  
Energy Saving ◽  
Technological Process ◽  
Water System ◽  
Cooling Water ◽  
Production Costs ◽  
Variable Pressure ◽  
Circulating Water ◽  
Circulating Water System

M199 is a kind of traditional drug fungicide, which is utilized widely in agriculture. The cooling circulating water system of such a production line consumes so much energy as to build cooling water supply model based on reaction vessel heat transfer mechanism and cooling requirement. The problems of the system is caused from improper pump selection, unreasonable condition adjustment methods, unscientific management, and difficulty in energy consumption evaluation and so on. In order to increase operation efficiency of the system and reduce the waste of energy, this paper surveyed the situation of equipment installation and M199 technological process, then compare the existing energy consumption with that under a variable frequency speed regulation to identify the space for energy saving, eventually complete the analysis of assessment of energy consumption in the whole system. Water supply system of variable pressure and flow is utilized under the premise of meeting the requirement of M199 technological process according to the pump affinity laws and by considering the energy-saving in the pump themselves and their systems so as to refurbish the system and realize the reduction of energy and production costs.

scholarly journals A scale removal and scale absorption method for circulating water system

2021 ◽  
Vol 676 (1) ◽  
pp. 012099
Author(s):  
Yao Yang ◽  
Xiaona Li ◽  
Xiang Li ◽  
Yuchao Li ◽  
Tianqi Meng ◽  
...  
Keyword(s):  
Water System ◽  
Absorption Method ◽  
Scale Removal ◽  
Circulating Water ◽  
Circulating Water System

Effect of heat flushing on the concentrations of Legionella pneumophila and other heterotrophic microbes in hot water systems of apartment buildings

1996 ◽  
Vol 42 (8) ◽  
pp. 811-818 ◽  
Author(s):  
Outi M. Zacheus ◽  
Pertti J. Martikainen
Keyword(s):  
Water Temperature ◽  
Legionella Pneumophila ◽  
Heterotrophic Bacteria ◽  
Water System ◽  
Water Systems ◽  
Hot Water ◽  
Circulating Water ◽  
Heterotrophic Microbes ◽  
Before And After ◽  
Circulating Water System

The decontamination of Legionella pneumophila and other heterotrophic microbes by heat flushing in four legionellae-positive hot water systems was studied. Before the decontamination procedure, the concentration of legionellae varied from 3.0 × 10−3 to 3.5 × 10−5 cfu/L and the hot water temperature from 43.6 to 51.5 °C. During the contamination the temperature was raised to 60–70 °C. All taps and showers were cleaned from sediments and flushed with hot water twice a day for several minutes. The decontamination lasted for 2–4 weeks. In a few weeks the heat-flushing method reduced the concentration of legionellae below the detection limit (50 cfu/L) in the hot circulating water system just before and after the heat exchanger. The high hot water temperature also decreased the viable counts of heterotrophic bacteria, fungi, and total microbial cells determined by the epifluorescent microscopy. However, the eradication of legionellae failed in a water system where the water temperature remained below 60 °C in some parts of the system. After the decontamination, the temperature of hot water was lowered to 55 °C. Thereafter, all the studied hot water systems were recolonized by legionellae within a few months, showing that the decontamination by heat flushing was temporary. Also, the contamination of other bacteria increased in a few months to the level before decontamination.Key words: legionellae, hot water system, decontamination, water temperature, heterotrophic bacteria.

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