Effect of Boiler Feedwater Inlet Locations on the Water Circulation Characteristics in a Firetube Boiler With the Non-Symmetrically Arranged Tube Passes 3 and 4

2002 ◽  
Author(s):  
Hyunjae Park ◽  
Anthony Bowman ◽  
Tod Stansfield ◽  
Brian Huibregtse ◽  
Steve Wilkinson ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Pressure Vessel ◽  
Water Circulation ◽  
Feed Water ◽  
Boiler Furnace ◽  
Boiler Water ◽  
Furnace Section ◽  
Circulation Patterns ◽  
Boiler Feedwater ◽  
Circulation Characteristics

Since the furnace section of a boiler is the primary heat transfer surface for the production of vapor, the overall water circulation patterns in the boiler will be significantly influenced by the circulation patterns near the furnace area. Boiler water circulation characteristics for a newly designed 4-pass firetube boiler with the non-symmetric arrangement of tube passes 3 and 4 were investigated in the previous work [1], in which the attraction forces between 28 different temperature nodes on the furnace wall were evaluated to predict the characteristics of water circulation near the boiler furnace. It was found that various non-symmetric water circulation patterns would occur for different firing conditions. As a consequence, in this paper, the analysis methods developed in the authors’ previous work are explicitly employed to predict and improve the water circulation in a firetube boiler when 6 different boiler feedwater inlet locations (3 on the right-hand side and 3 on the left-hand side of the boiler vessel shell) are used. Each side has 3 different feedwater inlet locations below the centerline of the boiler pressure vessel along its length. Investigation of the analysis results reveals that non-symmetric water circulation patterns are not unavoidable, but improvements in the water circulation and potentially the heat transfer rate can be achieved when the boiler feed water inlet is located near the front head of the boiler pressure vessel.

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.

scholarly journals Flooding Dynamics Within an Amazonian Floodplain: Water Circulation Patterns and Inundation Duration

2020 ◽  
Vol 56 (1) ◽  
Author(s):  
Sebastien Pinel ◽  
Marie‐Paule Bonnet ◽  
Joecila S. Da Silva ◽  
Tania C. Sampaio ◽  
Jérémie Garnier ◽  
...  
Keyword(s):  
Water Circulation ◽  
Circulation Patterns ◽  
Inundation Duration

scholarly journals Radiative Heat Transfer Analysis in a Marine Boiler Furnace

1986 ◽  
Vol 21 (5) ◽  
pp. 311-316
Author(s):  
Hiroshi Hayasaka ◽  
Kazuhiko Kudo ◽  
Hiroshi Taniguchi ◽  
Noboru Okigami ◽  
Taketoshi Takahashi ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Heat Transfer Analysis ◽  
Boiler Furnace ◽  
Marine Boiler

scholarly journals Treatment Method Assessment of the Impact on the Corrosivity and Aggressiveness for the Boiler Feed Water

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 1965 ◽  
Author(s):  
Skoczko ◽  
Szatyłowicz
Keyword(s):  
Water Quality ◽  
Water Treatment ◽  
Saturation Index ◽  
Treatment Plant ◽  
High Water ◽  
Feed Water ◽  
Exchange Cation ◽  
Boiler Water ◽  
The Impact ◽  
Boiler Feed Water

The aim of the study was the assessment of corrosivity and aggressiveness for boiler feed water. The negative effects of water corrosivity and aggressiveness may include silting up of the steel water supply system and the destruction of boiler equipment touched or washed by such water. They may cause the whole industrial production system to fail or be destroyed. That is why it was important to reach a high water purification level, including the calculation of water aggressiveness and corrosivity indicators. The carried out test showed that the simple system used before the modernization of the industrial water treatment plant is not sufficient to reach clean and stable water. The authors proposed modernization, including additional processes to improve boiler water quality, and designed new devices for water treatment. As a result of the new idea, groundwater taken as raw water was treated in individual and complex processes, such as pre-aeration, filtration, ion exchange (cation and anion exchange resigns), extra aeration, and extra degassing. The conducted research included chemical analyses of raw and treated water. In the conducted studies, the indirect method of water aggressiveness and corrosivity assessment was applied using mathematical calculation of the Langelier Saturation Index (LSI), the Ryznar Stability Index (RI), the Larson–Skold Index (LI), and the Singley Index (SI). The results proved that the new proposed processes for the boiler feed water treatment station allow reaching a high water quality and low level of water aggressiveness and corrosion.

The Care of Modern Steam-Generating Plant from the Water Side

1935 ◽  
Vol 129 (1) ◽  
pp. 7-70 ◽  
Author(s):  
R. J. Glinn
Keyword(s):  
High Pressures ◽  
Feed Water ◽  
Working Pressure ◽  
Correct Treatment ◽  
Boiler Water ◽  
Satisfactory Condition ◽  
Water Side ◽  
Rate Of Evaporation ◽  
Additional Reference ◽  
And Control

The condition of the metal of the boiler units of the modern steam-generating plant is affected by the condition of the water which is used as feed. Compared with typical figures of a few years ago, the working pressure and the degree of superheat of the steam have increased, in addition to the rate of evaporation resulting from improved methods of firing and combustion. These factors influence the effect of the water on the metal parts. An examination is made of various feed water circuits and of the methods of treating and controlling the quality of the feed and boiler water. Various examples are given of the difficulties which can occur, due to incorrect treatment and control, both in respect of scale and corrosion troubles. The causes of such troubles and the means for overcoming them are also considered. Instances of failures of economizer, boiler, and superheater tubes are given, and additional reference is made to the causes and effect of caustic embrittlement of the metal of the boiler. By careful attention to definite rules for the correct treatment and control of feed and boiler water conditions, steam-generating plants will keep in satisfactory condition under the exacting influence of the high pressures, high superheats, and high ratings of the present day.

Study on the Influence of Safety Injection Rate on the Process of SBLOCA

2013 ◽  
Author(s):  
He Hui ◽  
Liang-ming Pan
Keyword(s):  
Heat Transfer ◽  
Analytical Model ◽  
Pressure Vessel ◽  
Nuclear Reactor ◽  
Injection Rate ◽  
Relief Valve ◽  
Flow And Heat Transfer ◽  
Long Time ◽  
Nuclear Reactor Safety ◽  
Relap5 Code

After the nuclear accident of TMI-2, more and more researchers devote to the researches of SBLOCA. It is almost impossible for the large break LOCA depending on the probability of the accident during the reactor life cycle. But it is possible for SBLOCA, such as opening a relief valve for a long time. After reactor shutdown, reactor takes the form of directly safety injection, which has great effects on the flow and heat transfer of the reactor pressure vessel and it has influence on the process of the SBLOCA finally. In present work, an SBLOCA analytical model has been developed with RELAP5 code to analyze special design features at SBLOCA accident. The results are compared with the calculations from Westinghouse NOTRUMP code. This analytical model has also used to analyze the effects of different safety injection rate on the process of accident. The transient variation about some key parameters have been obtained. e.g. the temperature, pressure variations of core, void fraction of core. The results show that the rate of safety injection has significant influence on the process of SBLOCA and the characteristics about the heat transfer of pressure vessel. Different safety injection rates influence the nuclear reactor safety differently.

Deep water circulation patterns in the Atlantic during MISs 12-11

2020 ◽  
Author(s):  
Jasmin M. Link ◽  
Norbert Frank
Keyword(s):  
North Atlantic ◽  
Deep Water ◽  
Glacial Maximum ◽  
Water Circulation ◽  
Water Masses ◽  
Overturning Circulation ◽  
The Past ◽  
The North ◽  
Circulation Patterns ◽  
The North Atlantic

<p>Glacial Termination V is one of the most extreme glacial-interglacial transitions of the past 800 ka [1]. However, the changes in orbital forcing from Marine Isotope Stage (MIS) 12 to 11 are comparatively weak. In addition, MIS 11c is exceptionally distinct compared to other interglacials with for example a longer duration [2] and a higher-than-present sea level [3] despite a relative low incoming insolation. Therefore, the term “MIS 11 paradox” was coined [4]. However, only little is known about the Atlantic overturning circulation during this time interval [e.g. 5,6].</p><p>Here, we present Atlantic-wide deep water circulation patterns spanning the glacial maximum of MIS 12, Termination V, and MIS 11. Therefore, sediment cores throughout the Atlantic were analyzed regarding their Nd isotopic composition of authigenic coatings to reconstruct the provenance of the prevailing bottom water masses.</p><p>During the glacial maximum of MIS 12, the deep Atlantic Ocean was bathed with a higher amount of southern sourced water compared to the following interglacial. Termination V is represented by a sharp transition in the high-accumulating sites from the North Atlantic with a switch to northern sourced water masses. MIS 11 is characterized through an active deep water formation in the North Atlantic with active overflows from the Nordic Seas, only disrupted by a short deterioration. A strong export of northern sourced water masses to the South Atlantic points to an overall strong overturning circulation.</p><p> </p><p>[1] Lang and Wolff 2011, Climate of the Past 7: 361-380.</p><p>[2] Candy et al. 2014, Earth-Science Reviews 128: 18-51.</p><p>[3] Dutton et al. 2015, Science 349: aaa4019.</p><p>[4] Berger and Wefer 2003, Geophysical Monograph 137: 41-60.</p><p>[5] Dickson et al. 2009, Nature Geoscience 2: 428-433.</p><p>[6] Vázquez Riveiros et al. 2013, EPSL 371-372: 258-268.</p>

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