Analysis of Power Boiler Furnace Wall and Its Supporting Structure

2010 ◽  
Author(s):  
Jaecheol Kim ◽  
Taewoan Kim
Keyword(s):  
Fluid Pressure ◽  
Furnace Wall ◽  
Gas Pressure ◽  
Furnace Design ◽  
Boiler Furnace ◽  
Compression Load ◽  
Design Option ◽  
H Beam ◽  
Power Boiler ◽  
Space Plate

In this paper, wall tube stresses of power boiler furnace according to three different design options of furnace wall stiffening system were investigated. As the loading condition, furnace design gas pressure, fluid pressure inside the wall tube and the temperature difference between furnace wall and reaction plate were used. When the simplest design option is applied, wall tube stress levels are unsatisfactory. Furnace design gas pressure has strong influences on wall tube stress in this case. The second option using a reaction plate successfully decreased stresses on furnace wall tubes. However, another problem has arisen from using the reaction plate between furnace wall and wall stiffening H-beam called buckstay. When there are temperature differences between furnace wall and reaction plate, wall tubes are subjected to a large compression load. As final design option, the wall stiffening system using a space plate in addition to the reaction plate was analyzed. The space plate on reaction plate gives room to absorb differential thermal expansion between furnace wall and reaction plate, and satisfactory stress results on furnace wall tubes were obtained.

scholarly journals Experimental study of the thermochemical treatment of the low-grade coal prior to boiler combustion at coal-fired power station

2019 ◽  
Vol 109 ◽  
pp. 00119
Author(s):  
Volodymyr Yemelianenko ◽  
Vitalii Pertsevyi ◽  
Oleksandr Zhevzhyk ◽  
Iryna Potapchuk ◽  
Oleksandr Lutai
Keyword(s):  
Experimental Study ◽  
Power Plants ◽  
Thermal Power ◽  
Thermochemical Treatment ◽  
Gas Pressure ◽  
Pulverized Coal ◽  
Time Range ◽  
Low Grade ◽  
Boiler Furnace ◽  
Coal Fuel

Analysis of the perspectives of the coal fuel for thermal power plants is carried out. The necessity of the experimental study for temperature measurement in the boiler furnace. The results of the experimental study are presented: temperature change over time at the burner outlet for different constant pressure value of the backlighting gas, dependence of the temperature at the burner outlet from the backlighting gas pressure for constant concentration value of pulverized coal in coal-air mixture, dependence of the temperature at the burner outlet from the concentration of pulverized coal in coal-air mixture for constant value of the backlighting gas pressure, temperature measurements for constant backlighting gas pressure value, constant value of the concentration of pulverized coal in coal-air mixture when plasmatron is switched and operates for some time range. The results of the study could be applied to the solid fuel treatment for different thermal units.

Prediction of Water Circulation Characteristics in a 4-Pass Firetube Boiler With the Non-Symmetric Arrangement of Tube Passes 3 and 4

2001 ◽  
Author(s):  
Hyunjae Park ◽  
Anthony Bowman ◽  
Tod Stansfield ◽  
Brian Huibregtse ◽  
Steve Wilkinson ◽  
...  
Keyword(s):  
Nucleate Boiling ◽  
Relative Difference ◽  
Furnace Wall ◽  
Water Circulation ◽  
Feed Water ◽  
Attraction Force ◽  
Boiler Furnace ◽  
Nucleate Boiling Heat Transfer ◽  
Circulation Characteristics ◽  
Force Vectors

Abstract Water circulation characteristics, for a newly designed 4-pass 300 BHP (Boiler Horse Power) firetube boiler with a non-symmetric arrangement of tube passes 3 and 4, are investigated in this paper by means of measured furnace wall temperatures for different boiler firing conditions. Vapor production rate and intensity, at each of the 28 temperature measurement nodes, is approximated using the nodal temperature in conjunction with a nucleate boiling heat transfer mode on the water side of the furnace. Defining an attraction force that is proportional to the relative difference of the evaporation intensity between two nodes and inversely proportional to the distance between, the two-dimensional components of the attraction force can be calculated. Integrating all attraction force vectors between a node and the surrounding nodes produces a representative attraction force vector at the node. Similar calculation of the attraction force vectors at all of the temperature nodes on the furnace wall will characterize the water circulation near the boiler furnace. Investigations of the analysis results reveal various complicated non-symmetric water circulation patterns for different boiler firing conditions. Consequently, the analysis methods employed in this paper can be used to predict and improve the water circulation in a firetube boiler, particularly with regard to the placement of the boiler feed-water inlet location.

Structural Analysis of Utility Boiler Waterwall

2005 ◽  
Author(s):  
Tae-Woan Kim ◽  
Jae-Cheol Kim ◽  
Suk-Hwan Hwang
Keyword(s):  
Structural Design ◽  
Orthotropic Plate ◽  
Fluid Pressure ◽  
Gas Pressure ◽  
Dead Weight ◽  
Large Size ◽  
Asme Code ◽  
Stress States ◽  
Critical Zones ◽  
Part Model

The safe structural design of boiler waterwalls with various loadings such as dead weight, fluid pressure, gas pressure and thermal differences is an extensive problem demanding the use of sophisticated computation methods due to the complexity of the geometric structure and the large size of the walls. To evaluate the operating reliability of boiler waterwalls, it is essential to know not only overall behavior of the whole structure but also the stress states at the critical zones. In this paper, the structural soundness for the Korea standard 500MW boiler waterwalls is preliminary examined. The equivalent orthotropic plate model is used to investigate the structural behavior of boiler waterwalls under thermal differences. Submodeling technique for part model of boiler waterwalls is proposed to accurately compute stresses of waterwalls at the critical zones under gas pressure. The computed stresses are combined and finally compared with the allowable stress limits according to the criteria of ASME Code.

Particle Fluid Separation in Shear Flow of Dense Suspensions: Experimental Measurements on Squeezed Clay Pastes

2004 ◽  
Vol 14 (5) ◽  
pp. 256-265 ◽  
Author(s):  
Nicolas Roussel ◽  
Christophe Lanos
Keyword(s):  
Extensional Flow ◽  
Fluid Pressure ◽  
Squeezing Flow ◽  
Compression Load ◽  
Permeability Function ◽  
Dense Suspensions ◽  
Simple Compression ◽  
Clay Suspensions ◽  
Fluid Separation ◽  
Water Amount

AbstractParticle fluid separation is studied in the case of slow squeezing flow of dense clay suspensions. The fluid pressure gradient generated by the test induces heterogeneity in the sample. Experimental water content measurements at different time points through the test allow the quantification of this separation phenomenon. The problem equations are written in the case of purely extensional flow. Based on Terzaghi principle, Darcy’s law and a Cam Clay type constitutive equation, the influence of the permeability function on the predicted void ratio evolution is studied. It is then shown that a certain water amount is strongly linked to the grains and cannot be extracted from the sample using simple compression. This critical water amount is then taken in account in the permeability function in order to predict the compression load through the test.

Numerical simulation of pulverized coal combustion in a power boiler furnace

2015 ◽  
Vol 53 (3) ◽  
pp. 445-452 ◽  
Author(s):  
A. S. Askarova ◽  
V. E. Messerle ◽  
A. B. Ustimenko ◽  
S. A. Bolegenova ◽  
V. Yu. Maximov ◽  
...  
Keyword(s):  
Numerical Simulation ◽  
Coal Combustion ◽  
Pulverized Coal ◽  
Pulverized Coal Combustion ◽  
Boiler Furnace ◽  
Power Boiler

Boiler Furnace Design Methods

2000 ◽  
pp. 128-160 ◽  
Author(s):  
Prabir Basu ◽  
Cen Kefa ◽  
Louis Jestin
Keyword(s):  
Design Methods ◽  
Furnace Design ◽  
Boiler Furnace
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