Impact of a Novel Coating on Inorganic Scale Deposit Growth and Adhesion

2019 ◽  
Author(s):  
Marcus Heydrich ◽  
Ahmed Hammami ◽  
Suresh Choudhary ◽  
Marcos Mockel ◽  
John Ratulowski
Keyword(s):  
Scale Deposit

Does Barite Scale Deposit at a Kinetic Stable Flow?

2020 ◽  
Author(s):  
Alex Yi-Tsung Lu ◽  
Samridhdi Paudyal ◽  
Saebom Ko ◽  
Chong Dai ◽  
Bingjei Ouyang ◽  
...  
Keyword(s):  
Scale Deposit ◽  
Stable Flow

An Investigation of the Collapse and Surface Rewet in Film Boiling in Forced Vertical Flow

1975 ◽  
Vol 97 (2) ◽  
pp. 166-172 ◽  
Author(s):  
O. C. Iloeje ◽  
D. N. Plummer ◽  
W. M. Rohsenow ◽  
P. Griffith
Keyword(s):  
Nucleate Boiling ◽  
Boiling Temperature ◽  
Film Boiling ◽  
Test Surface ◽  
Loss Of Coolant Accident ◽  
Mass Fluxes ◽  
Loss Of Coolant ◽  
Scale Deposit ◽  
Transient Boiling ◽  
Scale Deposits

A transient boiling experiment has been run in such a way that one can acquire data in forced convection film, transition, and nucleate boiling regions for a specified pressure, quality, and mass flux. Transient boiling experiments were conducted at the Nuclear Energy Division of the General Electric Company for water in a 0.492 in. ID inconel X-750 tube at mass fluxes of 50,000, 100,000, and 250,000 lbm/hr-ft2, quality range of 30–100 percent and a pressure of 1000 psia. The reduced boiling curves for these data indicated temperature differences at burnout on the order of 100–200° F and temperature differences at the minimum ranging from 700 to 1100° F. These results (higher than in other experiments) are felt to be caused by scale deposit, axial conduction, and roughnesses on the test surface. Physical evidence indicates that the test surface became coated with an appreciable scale deposit when subjected to the initial temperatures in excess of 1500 °F in a steam atmosphere. It has been found (reference [1]) that BWR fuel will normally have scale deposit on the heat transfer surface and thus the qualitative effects of scale deposits in this report are expected to apply in BWR Loss-of-Coolant accident evaluation. An empirical correlation was developed for the data for minimum film boiling temperature differences. The correlation was based on Berenson’s minimum pool film boiling temperature difference correlation in order to provide a technique for extrapolating to different pressures.

Scale deposit removal by means of ultrasonic cavitation

Wear ◽  
2016 ◽  
Vol 356-357 ◽  
pp. 45-52 ◽  
Author(s):  
Boštjan Pečnik ◽  
Marko Hočevar ◽  
Brane Širok ◽  
Benjamin Bizjan
Keyword(s):  
Ultrasonic Cavitation ◽  
Scale Deposit ◽  
Deposit Removal

scholarly journals On precipitation of struvite (MgNH4PO4.6H2O)

2017 ◽  
Vol 1 (2) ◽  
pp. 21-29 ◽  
Author(s):  
Stefanus Muryanto
Keyword(s):  
Effect Of Temperature ◽  
Piping System ◽  
Divalent Metal Ions ◽  
Experimental Conditions ◽  
Common Component ◽  
Molar Ratios ◽  
Foreign Ions ◽  
Scale Deposit ◽  
Struvite Precipitation ◽  
Ph Level

Excessive input of N and P into water bodies causes eutrophication which leads to deterioration of aquatic evironments and has adverse effects naturally and economically. It is therefore urgent to remove N and P from wastewater prior to disposal into inland and coastal waters. Among the various removal methods, controlled struvite precipitation is preferred. Struvite (MgNH4PO4.6H2O) precipitates uncontrollably under the specific conditions producing a scale deposit causing persistent problems in industries and wastewater treatment plants. The scale deposit clogs the piping system and impair plant equipment. On the other hand, thanks to its composition and properties, struvite is a potential fertilizer. In medical field, struvite is a common component of kidney stones. A number of process parameters govern the struvite precipitation. This paper briefly presents these parameters: pH, molar ratios, temperature, mixing, and presence of foreign ions. pH level is considered as the most important variable affecting the precipitation of struvite and the pH level: 9.5 to 10.5 is seen as the optimum. For an effective precipitation the molar ratios of the struvite components, i.e. Mg:N:P should be at least unity. With regard to struvite solubility, the effect of temperature, in the range of 21oC to 49oC, is conflicting, which is probably due to different experimental conditions. Whilst agitation is not regarded as a decisive parameter, the influence of foreign ions, notably divalent metal ions, on struvite morphology and change of crystal phases is significant.

scholarly journals Scale Deposit Inhibitor for Kraft Digester.

1998 ◽  
Vol 52 (4) ◽  
pp. 469-475
Author(s):  
Hitoshi Ito ◽  
Masaru Okamoto
Keyword(s):  
Scale Deposit

scholarly journals Scale Deposit Problems and their Control in ECF Bleach Plants.

2002 ◽  
Vol 56 (4) ◽  
pp. 465-470
Author(s):  
Hirotaka Tanabe
Keyword(s):  
Scale Deposit
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