scholarly journals A Method for Separate Compensation of Nonlinear Statics and Linear Dynamics of Main Steam Pressure of Thermal Power Plant

1998 ◽  
Vol 1998 (0) ◽  
pp. 235-238
Author(s):  
Masatoshi NAKAMURA ◽  
Daisuke KUSHIDA ◽  
Satoru GOTO ◽  
Shiro MATSUMURA
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Steam Pressure ◽  
Linear Dynamics ◽  
Main Steam

Review of Control Strategies Employing Neural Network for Main Steam Temperature Control in Thermal Power Plant

2014 ◽  
Vol 66 (2) ◽  
Author(s):  
N. A. Mazalan ◽  
A. A. Malek ◽  
Mazlan A. Wahid ◽  
M. Mailah
Keyword(s):  
Neural Network ◽  
Power Plant ◽  
Temperature Control ◽  
Pid Control ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Heat Rate ◽  
Steam Temperature ◽  
Multiple Variables ◽  
Main Steam

Main steam temperature control in thermal power plant has been a popular research subject for the past 10 years. The complexity of main steam temperature behavior which depends on multiple variables makes it one of the most challenging variables to control in thermal power plant. Furthermore, the successful control of main steam temperature ensures stable plant operation. Several studies found that excessive main steam temperature resulted overheating of boiler tubes and low main steam temperature reduce the plant heat rate and causes disturbance in other parameters. Most of the studies agrees that main steam temperature should be controlled within ±5 Deg C. Major factors that influenced the main steam temperature are load demand, main steam flow and combustion air flow. Most of the proposed solution embedded to the existing cascade PID control in order not to disturb the plant control too much. Neural network controls remains to be one of the most popular algorithm used to control main steam temperature to replace ever reliable but not so intelligent conventional PID control. Self-learning nature of neural network mean the load on the control engineer re-tuning work will be reduced. However the challenges remain for the researchers to prove that the algorithm can be practically implemented in industrial boiler control.

Economic Analysis of a 660MW Supercritical Turbine for Steam Initial Parameters

2014 ◽  
Vol 960-961 ◽  
pp. 1550-1553 ◽  
Author(s):  
Yu Lin Tang ◽  
Shan Tu ◽  
Yang Du ◽  
Chao Wang ◽  
Hong Juan Wang
Keyword(s):  
Power Plant ◽  
Thermal Power ◽  
Steam Pressure ◽  
Heat Consumption ◽  
Operating Parameters ◽  
Steam Temperature ◽  
Operating Modes ◽  
Endothermic Process ◽  
Steam Parameters ◽  
Main Steam

Economic diagnosis of thermal power units is to determine the economy of its operating parameters and operating modes by quantitative and qualitative analysis, which is significant to economic operation and energy saving of power plant. On the basis of equivalent enthalpy drop method and the theory of variable conditions, the economic diagnosis model of operating parameters was established. As main steam temperature and main steam pressure for example, economic diagnosis of a 660MW supercritical steam turbine unit was performed. The result demonstrates that improving the main steam temperature or main steam pressure can reduce heat consumption of the unit. The essence of improving the initial steam parameters is to improve the average temperature of the steam cycle endothermic process, thus improving the circulation efficiency and reducing heat consumption. The economic impact of main steam temperature is up to 0.61g/(kW·h), while which of main steam pressure is little. Therefore, by increasing the initial steam parameters, especially the main steam temperature, to improve the economy of the entire power plant is the main way to enhance the efficiency of power plant in the current.

Residual life prediction of service exposed main steam pipe of boilers in a thermal power plant

2000 ◽  
Vol 7 (5) ◽  
pp. 359-376 ◽  
Author(s):  
A.K. Ray ◽  
Y.N. Tiwari ◽  
R.K. Sinha ◽  
S. Chaudhuri ◽  
R. Singh
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Life Prediction ◽  
Residual Life ◽  
Thermal Power ◽  
Steam Pipe ◽  
Residual Life Prediction ◽  
Main Steam

Application of Continuous Indentation Technique in Thermal Power Plant

2007 ◽  
Vol 26-28 ◽  
pp. 1149-1152
Author(s):  
Doo Song Gil ◽  
Yeon Shik Ahn ◽  
Sang Ki Park
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Indentation Technique ◽  
Stiffness Evaluation ◽  
Reheat Steam ◽  
Main Steam ◽  
Continuous Indentation ◽  
Steam Pipes ◽  
Service Inspection

Reliability evaluation of the welded structure is divided by method concentrating on defect and mechanical property. Thermal power plant facilities are operated in high temperature, high pressure and called for safety guarantee. Three factors are constituted for this. The First is PSI(pre-service inspection) and the second is ISI(in-service inspection) and the third is quantitative analysis in safety. Main steam and hot reheat steam pipes in thermal power plant are frequently making a trouble because of unsuitable quality control under construction. So, the suitable construction and the development of life forecast method is urgent matter. Therefore, the continuous indentation technique is interested in effective test method of pipes in power plant facilities. This strong point of the continuous indentation technique is possibility of super-precision measurement, programmed test analysis, nondestructive stiffness evaluation. This study is focused on the possibility of the continuous indentation technique application in main steam and hot reheat steam pipes for stiffness evaluation in thermal power plant facilities.

Determination of the Optimal Initial Steam Pressure for the Power Plant Under Different Loads

2012 ◽  
Vol 622-623 ◽  
pp. 1067-1071
Author(s):  
De Liang Zeng ◽  
Can Peng ◽  
Zhao Liang Guan ◽  
Rui Shen
Keyword(s):  
Power Plant ◽  
System Analysis ◽  
Thermal Power ◽  
Initial Point ◽  
Initial Pressure ◽  
Steam Pressure ◽  
Heat Absorption ◽  
Main Steam ◽  
Passage Efficiency ◽  
Variable Condition

Combined with the thermal system analysis, the mathematical model for selecting the optimal initial pressure of the power unit is established based on the comprehensive consideration of the effect of main steam pressure on governing stage efficiency, steam feed pump consumption and flow passage efficiency. Then the steam pressure with the maximum unit efficiency is searched using variable condition calculation. With quantitative calculations of N600-16.7/537/537-I unit of Pan Shan thermal power plant taken as an example, the optimal initial pressure is obtained by exhaustive method around the 75% load point. The results reveal that the unit power, heat absorption and unit efficiency all increase with the increase of the main steam pressure. However, the increasing velocity of efficiency is less than heat absorption when main steam pressure attains to certain value, which makes the unit efficiency begin to decrease. Therefore, this main steam pressure is the optimal initial point to be searched.

scholarly journals Analysis of Special Consequences and Losses of Equipment Accident in Thermal Power Plant

2021 ◽  
Vol 252 ◽  
pp. 02018
Author(s):  
Shuai Kong ◽  
Xuefen Yu ◽  
Zhangwei Ling ◽  
Ping Tang ◽  
Nanhui Jin
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Special Property ◽  
Calculation Model ◽  
Economic Losses ◽  
Special Equipment ◽  
Pipe Burst ◽  
Safety Accident ◽  
Main Steam

Many types of equipment in the thermal power plant has special risks. Once a safety accident occurs, it often causes special consequences and losses. The indirect losses are difficult to calculate in general due to the special property. In this paper, a calculation model was proposed, considering collateral production impact on upstream and downstream industries, the inconvenience impact on people’s electricity and gas supply, and social security panic by rapidly spreading to media and public opinion. An example of a main steam pipe burst accident in a thermal power plant was analysed. The ratio of indirect economic losses and direct economic losses was obtained. Results showed that the ratio value (35.4) was much higher than the value (4) of general industrial accident loss. The ratio value maybe even much higher if the internal medium of special equipment has strong toxic and harmful effects. It is quite important to make concerted efforts to manufacture, usage, management, inspection, safety monitoring, and scientific supervision, in order to detect and eliminate hidden dangers early and ensure the safe operation of special equipment.

Modeling of the Coal-Fired Utility Boiler in a Thermal Power Plant Based on Macro Energy Balance

2013 ◽  
Vol 732-733 ◽  
pp. 29-36 ◽  
Author(s):  
Tong Yu ◽  
Jing Qi Yuan
Keyword(s):  
Energy Balance ◽  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Actual Process ◽  
Process Data ◽  
Utility Boiler ◽  
Rolling Parameter ◽  
Operation Conditions ◽  
Main Steam

A modeling method of the coal-fired utility boiler for a 300MW thermal power plant based on energy balance is presented. Key work sections of the power plant are treated as lumped parameter systems and a first-order model with time delay is used to describe the dynamic characteristic of the entire system. As model validation, comparison between model simulations and the actual process data for the energy of the main steam and hot reheated steam is given. Basically, the model is found to be able to track the output power variations of the boiler under different operation conditions. Rolling parameter identification of the model may further improve the model accuracy.

scholarly journals A DEMATEL Technique to Analyze the Drivers for Affecting the Efficiency of Steam Turbine

2019 ◽  
Vol 8 (4S2) ◽  
pp. 238-243
Keyword(s):  
Global Warming ◽  
Power Plant ◽  
Steam Turbine ◽  
Thermal Power Plant ◽  
Power Plants ◽  
Mechanical Energy ◽  
Thermal Power ◽  
Electrical Power ◽  
Steam Pressure ◽  
Turbine Efficiency

The global warming is a major thread in recent days. Industrial pollution is a prime contributor to global warming especially pollution due to coal fired power plants. In global electrical power scenario, maximum portion of required electrical energy is produced from coal fired thermal power plants. Steam turbine is major equipment in it, which converts heat energy in to mechanical energy. The energy conversion efficiency is most important one. Reduction in efficiency means wastage or loss of energy and leads to increase the cost of generation. Here, case study is conducted in the topmost coal fired thermal power plant in south India. The objective of the study is to recognize and evaluate the most influential drivers in the coal fired thermal power plant. If the most important drivers which highly influencing steam turbine efficiency are identified. In this paper, to recognize the most influential drivers for affecting steam turbine efficiency by using DEMATEL technique. The outcomes of the paper expose that steam pressure (D1) is the most influential driver in the coal fired thermal power plant and they need more focus to control it

scholarly journals The Optimal Steam Pressure of Thermal Power Plant in a Given Load

2013 ◽  
Vol 05 (04) ◽  
pp. 278-282 ◽  
Author(s):  
Yong Hu ◽  
Ji-zhen Liu ◽  
De-liang Zeng ◽  
Wei Wang ◽  
Ya-zhe Li
Keyword(s):  
Power Plant ◽  
Thermal Power Plant ◽  
Thermal Power ◽  
Steam Pressure
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