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.

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.

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.

The Solar Energy-Air Source Heat Pump Was Applied to the Hot Water System

2014 ◽  
Vol 587-589 ◽  
pp. 243-246
Author(s):  
Chu Ping Lu ◽  
Kai Ji
Keyword(s):  
Solar Energy ◽  
Heat Pump ◽  
Water System ◽  
Hot Water ◽  
Water Heater ◽  
Circulating Water ◽  
Air Source Heat Pump ◽  
Hot Water Supply ◽  
The City

This paper is as an example of the hot water supply of the hotel in the city,The design of the hot water system is the solar energy and the air source heat pump,includes:the selection calculation of the air source heat pump of the water heater , the selection and calculation of the solar collector,the determination of the thermal storage tank and the determination of the circulating water pump of heat collecting .

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.

The Pressure Loss Alarm System of Circulating Water in Calcium Carbide Furnace

2013 ◽  
Vol 401-403 ◽  
pp. 1144-1148
Author(s):  
Fen Su Shi ◽  
Yang Zhou ◽  
Yong Wu
Keyword(s):  
Real Time ◽  
Pressure Loss ◽  
Water System ◽  
Calcium Carbide ◽  
Alarm System ◽  
Monitoring Methods ◽  
Field Bus ◽  
Circulating Water ◽  
Automation And Control ◽  
Circulating Water System

In order to improve the manual monitoring methods of the circulating water in calcium carbide furnace, this paper designs a pressure loss alarm system about circulating water of calcium carbide furnace. The system completes real-time automation and control of circulating water system by combining PLC technology, field bus communication technology and configuration technology, which uses PROFIBUS field bus to communicate between upper computer and lower computer. The practical application shows that this system can effectively achieve real-time monitoring of the circulating water, fault diagnosis and maintenance management.

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