scholarly journals Calculation methods of steam boiler operation factors under varying operating conditions with the use of computational thermodynamic modeling

Energy ◽  
2020 ◽  
Vol 197 ◽  
pp. 117221 ◽  
Author(s):  
Paweł Madejski ◽  
Piotr Żymełka
Keyword(s):  
Thermodynamic Modeling ◽  
Operating Conditions ◽  
Steam Boiler ◽  
Calculation Methods ◽  
Computational Thermodynamic ◽  
Boiler Operation

Validation of Hydrodynamic Stability of Supercritical Once-Through Boiler

2008 ◽  
Author(s):  
Bing Wei ◽  
Dong Zhou
Keyword(s):  
Flow Instability ◽  
Hydrodynamic Instability ◽  
Pressure Head ◽  
Operating Conditions ◽  
Hydrodynamic Characteristics ◽  
Boiler Operation ◽  
Calculation Results ◽  
Low Mass ◽  
The Stability ◽  
Heating Loads

Operating safety is one of the most important things to supercritical once-through boilers. To study the hydrodynamic characteristics of fluid in water walls of supercritical once-through boilers and to find out the instable factors will be of great significance to boiler operation. In this paper the mathematical models for hydrodynamic characteristics of fluid in water walls are established. With an example of 600MW boiler, by using the calculation program, the hydrodynamic characteristics curves without and with the throttles at the inlets of the water walls at different operating conditions are presented, the fluid flow instability and the reasons are analyzed. The calculation results show that the boiler operates stably and safely at 100% MCR (Maximum Continuous Rating) condition, the hydrodynamic instability exists at low heating loads of 30% MCR. The method of installing the throttles at the inlets of the water wall pipes will increase the parabola characteristics, help to improve the fluid instability to a certain stable extent, but due to the small curve slopes at low mass flowrates, still need to pay more attention to the low heating loads operation. The existence of gravity pressure head is good to the stability of the vertical upward flow.

Paper 11: Feed Pumps for Modern Steam Boiler Applications, Design, Development, and Operation

1969 ◽  
Vol 184 (14) ◽  
pp. 108-148
Author(s):  
P. S. Neporozhnii ◽  
A. K. Kirsh
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Operating Conditions ◽  
Steam Boiler ◽  
Design Development ◽  
Feed Pump ◽  
Design Features ◽  
Power Plant Equipment ◽  
Plant Equipment

This paper describes the operating conditions which form the basis for determining the various types of feed pump units needed to equip the main power plant equipment in the U.S.S.R. The principles upon which the feed pump groups are selected, according to the type of equipment installed in different power plants, are considered. The system diagrams and design features of the feed pumps are presented, together with descriptions of how they are driven.

Burner Component Upgrades for Wall-Fired Coal Burners: RPI Results and Experiences

2011 ◽  
Author(s):  
Stephen W. Black ◽  
Murat Yaldizli
Keyword(s):  
Second Generation ◽  
Fluid Dynamic ◽  
Cost Effective ◽  
Operating Conditions ◽  
Cfd Modeling ◽  
Nox Emissions ◽  
Effective Components ◽  
Utility Companies ◽  
Boiler Operation ◽  
First And Second Generation

Improving the operation and emissions performance of coal fired utility boilers equipped with first and second-generation wall fired low NOx coal burners is of significant interest to many utility companies today. The recent development of cost effective components for existing first and second-generation wall fired burners permits better combustion performance, increased wear life reliability, and decreased NOx emissions. Existing air register systems can typically remain in place, resulting in reduced capital cost and reduced outage time for installation. Computational fluid dynamic (CFD) modeling is used to assist in the design of key burner components and operating conditions that enable further reduction of NOx emissions. Results include better flame attachment, better airflow recirculation patterns, and early ignition and pyrolysis of the coal in a more controlled primary combustion zone. NOx reductions of 10–20% have been demonstrated using burner component upgrades with improved overall boiler operation. This paper gives a brief description of the component-only retrofit design methodology that Riley Power Inc., a Babcock Power Inc. company developed for other OEM’s low NOx burners in wall-fired furnaces. The numerical modeling to assist in the design of these low NOx systems and the corresponding CFD results are also discussed.

scholarly journals Thermal-hydraulic modeling of the steady-state operating conditions of a fire-tube boiler

2009 ◽  
Vol 24 (1) ◽  
pp. 29-37 ◽  
Author(s):  
Ahmed Rahmani ◽  
Ahmed Dahia
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Hydraulic Modeling ◽  
Sensitivity Study ◽  
Operating Conditions ◽  
Saturated Steam ◽  
Operating Pressure ◽  
Operating Data ◽  
Boiler Operation ◽  
Calculation Results

In this work, we are interested to simulate the thermal-hydraulic behavior of three-pass type fire-tube boiler. The plant is designed to produce 4.5 tons per hour of saturated steam at 8 bar destined principally for heating applications. A calculation program is developed in order to simulate the boiler operation under several steady-state operating conditions. This program is based upon heat transfer laws between hot gases and the fire-tube internal walls. In the boiler combustion chamber, the heat transfer has been simulated using the well-stirred furnace model. In the convection section, heat balance has been carried out to estimate the heat exchanges between the hot gases and the tube banks. The obtained results are compared to the steady-state operating data of the considered plant. A comparative analysis shows that the calculation results are in good agreement with the boiler operating data. Furthermore, a sensitivity study has been carried out to assess the effects of input parameters, namely the fuel flow rate, air excess, ambient temperature, and operating pressure, upon the boiler thermal performances.

Computational thermodynamic modeling of the Mg-B system

Calphad ◽  
2001 ◽  
Vol 25 (2) ◽  
pp. 299-303 ◽  
Author(s):  
Zi-Kui Liu ◽  
Yu Zhong ◽  
D.G. Schlom ◽  
X.X. Xi ◽  
Qi Li
Keyword(s):  
Thermodynamic Modeling ◽  
Computational Thermodynamic

Thermal Shock Testing and Analysis of IN617 and Super 304H Samples

2009 ◽  
Vol 131 (3) ◽  
Author(s):  
J. P. Shingledecker ◽  
R. L. Battiste ◽  
P. Carter
Keyword(s):  
Thermal Shock ◽  
Rupture Life ◽  
Operating Conditions ◽  
Steam Boiler ◽  
Elastic Plastic ◽  
Shock Testing ◽  
Failure Data ◽  
Prediction Techniques ◽  
Outside Diameter ◽  
Plastic Creep

The DOE/OCDO sponsored Ultrasupercritical Steam Boiler Consortium is conducting thermal shock tests on austenitic and nickel-based materials to assess their use in thick-section boiler components. This paper describes the tests on CCA617 (a controlled chemistry version of IN617) and Super 304H thick-walled tubes. Details are given of the metallurgical analyses of the observed cracking in the bore and on the outside diameter of the samples, and of the thermal-mechanical analyses to explain the results. Elastic-plastic and elastic-plastic-creep analyses are used to calculate damage based on rupture life and creep strain accumulation. The results of the metallurgical and mechanical analyses are compared, and conclusions are drawn as to the accuracy and effectiveness of available high temperature life prediction techniques. The test conditions bear no relation to expected operating conditions. They are chosen to generate failure data.

scholarly journals Impact of air stagging in furnace on processes in power steam boiler TPP Kostolac B

Tehnika ◽  
2021 ◽  
Vol 76 (1) ◽  
pp. 43-49
Author(s):  
Goran Stupar ◽  
Dragan Tucaković
Keyword(s):  
Power Plants ◽  
Nox Reduction ◽  
Steam Boiler ◽  
Reliable Prediction ◽  
Boiler Operation ◽  
Steam Boilers ◽  
Calculation System ◽  
Air Staging ◽  
Maximum Content

The European normatives prescribe the maximum content of 200 mg/Nm3 in dry flue gases with oxygen content of 6% for existing pulverized coal-fired power plants. In order to analyse the effects of applying some of the primary measures for NOx reduction on the overall steam boiler operation, calculational coupling of differential mathematical models has been applied. This calculation system enables reliable prediction of the performance of power steam boilers also in substoichiometric conditions, and the quality of the boiler operation can be described from the perspective of its effective, efficient, safe and ecological operation. In accorrdance to that, calculations of the steam boiler unit 1 TE Kostolac B have been carried out for the existing and the air staging combustion system. This paper presents an analysis of the influence of various parameters on the operation of the steam boiler with the application of primary measures.

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