scholarly journals Numerical Investigation of the Effect of Excess Air and Thermal Power Variation in a Liquid Fuelled Boiler

2016 ◽  
Author(s):  
Bilal Sungur ◽  
Bahattin Topaloglu ◽  
Lutfu Namli ◽  
Hakan Ozcan
Keyword(s):  
Numerical Investigation ◽  
Thermal Power ◽  
Power Variation ◽  
Excess Air

Research on the Realization of the Maximum Benefit of Thermal Power

2015 ◽  
Vol 713-715 ◽  
pp. 660-663
Author(s):  
Jia Min Chen
Keyword(s):  
Real Time ◽  
Oxygen Content ◽  
Thermal Power ◽  
Balance Method ◽  
Excess Air ◽  
Maximum Benefit ◽  
Function Expression ◽  
New Variables ◽  
The Relationship

First, Anti-balance method is used to build the model of q2,q3,q4 to figure out the Function expression of q2+q3+q4 .when q2+q3+q4 gets the minimum, the corresponded to the excess air ratio is the best excess air ratio. The excess air ratio is related to the load of boiler, so the function image describing the relationship between q2+q3+q4 and excess air ratio under the different load of 192.3MW, 215.8MW, 245.3MW and 298MW are made to get the best excess air ratio. Second, based on the model before, new variables q5 and q6 are added to complete the function formula of the efficiency and the excess air ratio, and four function image will be drew to show the tends. Finally, based on the conclusions above, smoke vents oxygen content can take the place of excess air ratio to achieve the purpose of monitoring the boiler in real time.

Characteristics of Rheinisch Brown Coals With Respect to Their Combustion and Fouling Behavior in Thermal Power Stations

1977 ◽  
Vol 99 (4) ◽  
pp. 679-683 ◽  
Author(s):  
K. Hein
Keyword(s):  
Thermal Power ◽  
Research Programme ◽  
Operating Parameters ◽  
Power Station ◽  
Power Stations ◽  
Excess Air ◽  
Thermal Power Stations ◽  
Brown Coals ◽  
First Results ◽  
Fouling Characteristics

In the paper first results of a several years’ research programme into the combustion and fouling characteristics of Rheinish brown coals are given. As described, fouling of the heat transfer surfaces causes severe difficulties for power station operation. The deposit formation is strongly dependent on both the composition of the inherent ash of the fuel and the extraneous impurities. The phenomenon of fouling can be influenced by operating parameters like excess air level and mixing between fuel and combustion air. The temperature of the heat receiving surface as well as its geometry play an important role.

The Analysis between Two Different Methods of Power Plant Boiler Thermal Efficiency

2014 ◽  
Vol 536-537 ◽  
pp. 1578-1582 ◽  
Author(s):  
Po Li ◽  
Cheng Wei Zhang
Keyword(s):  
Power Plant ◽  
Thermal Efficiency ◽  
Power Plants ◽  
Performance Test ◽  
Thermal Power ◽  
National Standard ◽  
Test Procedures ◽  
Excess Air ◽  
Power Plant Boiler ◽  
Plant Boiler

The power plant boiler is one of the most important facilities in thermal power plants. The thermal efficiency of power plant boilers is the index. This paper discusses the relationship between the boiler thermal efficiency and the coefficient of excess air via two methods, one is called the simplified calculating formula and the other is the calculating formula according to the The People's Republic of China national standard power plant boiler performance test procedures. According to the proposed methods, by solving the same optimal problem, optimum excess air coefficients are obtained. Then a comparative analysis is given. Moreover, an improved way for saving calculation time to get the coefficients of the mixed coal in the so called simplified calculating formula is developed.

Optimized Operation of Boiler

2014 ◽  
Vol 960-961 ◽  
pp. 399-404
Author(s):  
Chang Liu
Keyword(s):  
Heat Loss ◽  
Power Plants ◽  
Thermal Power ◽  
Optimal Operation ◽  
Operating Efficiency ◽  
Combustion Heat ◽  
Correlative Analysis ◽  
Excess Air ◽  
Boiler Efficiency ◽  
Excess Air Coefficient

This paper studies the problem of optimal operation of 300MW boiler. We combine the actual situation of the device and the theory of heat together, and improve the operating efficiency of the boiler through adjustment of device parameters, thus improving the economic benefit of thermal power plants. Firstly, according to coal characteristics and the theory of heat, we establish an improved utility model to calculate the heat loss of exhaust - gas, chemical incomplete combustion heat loss and heat loss of mechanical incomplete combusting. Then, we use fitting and interpolation, which is always applied to problems of Discrete Mathematical Statistics, to analyze discrete form of experiment data record, and give the relationship between 300MW boiler efficiency and excess air coefficient, which leads us to a new way to ascertain optimal excess air coefficient. And then, we use Principal Components Analysis (PCA) and Correlative Analysis (CA) to study the affection of operation parameters on boiler efficiency. Finally, we combine local optimization with global optimization, and establish an optimal operational model.

scholarly journals Numerical investigation of reliability of pump systems from thermal power plants

2018 ◽  
Vol 22 (Suppl. 1) ◽  
pp. 137-142
Author(s):  
Ayse Bugatekin
Keyword(s):  
Numerical Investigation ◽  
Power Plants ◽  
Maximum Likelihood Method ◽  
Thermal Power ◽  
Intensity Function ◽  
Likelihood Method ◽  
Thermal Power Plants ◽  
Time Between Failures ◽  
Intensity Functions ◽  
Function Models

This article deals with numerical investigation of reliability of pump systems from thermal power plants. The reliability is examined by using intensity function for a system composed of n-linearly ordered pumps. The time between failures of pumps is taken as experimental. Firstly, appropriate model for the data is determined. Estimates of parameters are obtained with maximum likelihood method and intensity function models are written. Finally, reliability of consecutive 3-out-of-5:F systems are calculated for certain time periods by using the obtained intensity functions.

Numerical and Experimental Study of the Effect of Injected CO2 Flow on the Stability of Flameless Combustion

2020 ◽  
Vol 13 (1) ◽  
Author(s):  
Cristian C. Mejía ◽  
Alex M. García ◽  
Julián E. Obando ◽  
Andrés A. Amell
Keyword(s):  
Thermal Power ◽  
Radiation Heat Transfer ◽  
Combustion Process ◽  
Dilution Effect ◽  
Combustion Regime ◽  
Co2 Injection ◽  
Flameless Combustion ◽  
Ansys Fluent ◽  
Excess Air ◽  
The Stability

Abstract The effect of the injection of externally sourced carbon dioxide (CO2) on the stability of the flameless combustion regime was evaluated numerically and experimentally, taking temperature uniformity and pollution emissions (NO and CO) as criteria. The flameless combustion regime was studied in a lab-scale furnace fueled with natural gas (NG) at a thermal power of 20 kW based on the low heating value (LHV). The CO2 was injected into the lower part of the furnace to directly affect the reaction zone. Computational fluid dynamics (CFD) simulations were performed using the ansys-fluent software. The models used to describe the turbulence, the radiation heat transfer, and the turbulence–chemistry interaction were the standard k–ɛ model, discrete ordinate model (DOM), and eddy dissipation concept (EDC) model, respectively. The NG oxidation was described with a seven-step global reaction mechanism with the EDC model. Three excess air conditions were analyzed, 20%, 25%, and 30%, combined with various CO2 injection flows. At 30% excess air, the flame exhibited destabilization without any CO2 injection. Adding CO2 attenuates the destabilization because of the dilution effect. Increasing either the CO2 or excess air flow resulted in a considerable decrease in the global temperature of the process, consequently producing an increase in CO emissions and a decrease in NO emissions. Finally, for the conditions studied, increasing the mass flow of externally sourced CO2 did not destabilize the flameless combustion regimen. This result shows the potential of the implementation of flameless combustion in industrial processes where CO2 is releasing as a result of a reaction external to the combustion process, such as cement, ammonia, or lime production among others.

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