Circulating Water Resistance Characteristics of the Thermal Power Plant

2012 ◽  
Vol 614-615 ◽  
pp. 573-576
Author(s):  
Yong Li ◽  
Jing Li
Keyword(s):  
Power Plant ◽  
Water Flow ◽  
Characteristic Curve ◽  
Thermal Power ◽  
Water System ◽  
Computation Method ◽  
Long Distance ◽  
Circulating Water ◽  
Circulating Water System ◽  
Curve Intersection

The measurement method of the power plant circulating water flow was investigated. When the characteristics of the circulating water system was calculated through characteristic curve intersection, circulating water pumps were generally assumed to be in parallel and the resistance of main pipes was ignored. In addition, the circulating water flow of each unit was considered equivalent. This method was accurate only when the distance of main pipe and circulating water pump is shorter. Therefore, the hydraulic computation method combining with pipe network has been proposed with the long distance condition. This method calculates accurately the circulating water flow of each unit. This research lays the foundation for the optimum vacuum calculation of the whole plant.

Analysis on Circulating Water Heat Utilization Technology in Thermal Power Plants

2013 ◽  
Vol 753-755 ◽  
pp. 2727-2730
Author(s):  
Jian Tao Liu ◽  
Xiao Cheng Ma ◽  
Kun Kun You ◽  
Jian Xing Ren ◽  
Yong Wen Yang
Keyword(s):  
Power Unit ◽  
Heat Pump ◽  
Power Plants ◽  
Waste Heat ◽  
Thermal Power ◽  
Water System ◽  
Water Source ◽  
Circulating Water ◽  
Heat Utilization ◽  
Circulating Water System

The thermal power unit is the major unit in Chinas power supply. Circulating water has large low-temperature waste-heat which can be recycled. The principles of water source heat pump technology is analyzed, characteristic of circulating water system in thermal power unit is studied. Then two kinds of connection methods between circulating water system and water source heat pump (WSHP) are presented.

Thermal Power Plant Circulating Water Flow Measurement Method Research

2013 ◽  
Vol 316-317 ◽  
pp. 1143-1146
Author(s):  
Zheng Xian Wang ◽  
Bao Ren Guo ◽  
Min Zhang ◽  
Jian Yong Yang ◽  
Li Liu
Keyword(s):  
Power Plant ◽  
Water Flow ◽  
Thermal Power Plant ◽  
Flow Measurement ◽  
Measurement Method ◽  
Thermal Power ◽  
Large Diameter ◽  
Optimal Operation ◽  
Measuring Device ◽  
Circulating Water

This paper given an online flow measurement method of large diameter pipe and low-head. This method can be applied to measure circulating water flow of thermal power plant. The characteristics of method is that: the measuring device adapted the method to solve the problem of the online flow measurement of circulating water, and to provide the necessary operating parameters for optimal operation of the unit cold-end system.

Energy Saving and Optimization Research on the Condensation-Steam System of a Supercritical Thermal Power Plant

2011 ◽  
Author(s):  
Yunyun Zhao ◽  
Yanping Zhang ◽  
Shuhong Huang ◽  
Jianlan Li ◽  
Yueqin Li
Keyword(s):  
Power Plant ◽  
Water Flow ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Cooling Water ◽  
Vacuum Pump ◽  
Circulating Water ◽  
Operation Conditions ◽  
Pump Output ◽  
Steam System

The efficiency and reliability of thermal power plant directly depends on conditions of the condensation-steam system. The key of energy-saving and optimal operation in condensation-steam system is to adjust the circulating cooling water flow with different operation conditions to get the optimal vacuum. This paper presents the optimal mathematical model of circulating water flow of a 600MW supercritical thermal power plant using Matlab/Simulink. And this model has comprehensively considered the coupling influence of many parameters on the optimal vacuum, including circulating cooling water temperature, cooling water flow, vacuum pump output, condenser cleanness, and makeup water. This model can not only simulate the thermodynamic parameters of the condensation-steam system on operation conditions, but also simulate the influence of the health status of condensation-steam equipments on the operating performance. The accuracy of this model is validated by comparing the simulation results with design parameters under different conditions. We studied the optimal vacuum on off-design conditions using the model. The research shows that the change of the vacuum pump output will affect the results of the optimum circulating water flow, so the net power of the unit should be calculated with consideration of the change of the vacuum pump output in order to get the more practical optimal circulating water flow. The cleanliness of heat transfer surface has a great influence on the optimum circulating water flow. When the cleanliness is poor, the unit needs larger circulating flow to maintain the optimal vacuum. We should estimate the cleanliness of heat transfer surface to arrange suitable cleaning interval time according to the operation conditions of the unit.

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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