scholarly journals Evaluation of pitting corrosion of heat exchanger tubes in cooling water by extreme value statistical analysis.

1987 ◽  
Vol 36 (400) ◽  
pp. 72-75 ◽  
Author(s):  
Shin-ichi TAKASAKI ◽  
Takeshi KONTANI
Keyword(s):  
Statistical Analysis ◽  
Heat Exchanger ◽  
Pitting Corrosion ◽  
Cooling Water ◽  
Extreme Value

Prediction and Performance of Compact Latent Heat Recovery Heat Exchanger With Small Diameter Tubes

2007 ◽  
Author(s):  
Masahiro Osakabe
Keyword(s):  
Heat Exchanger ◽  
Power System ◽  
Latent Heat ◽  
Heat Recovery ◽  
Small Diameter ◽  
Cooling Water ◽  
Prediction Method ◽  
Outer Diameter ◽  
Exhaust Gas ◽  
And Performance

The most part of energy losses in power system such as fuel cells is due to the heat released by the exhaust gas to atmosphere. The exhaust gas consists of non-condensable gas and steam with sensible and latent heat. As a lot of latent heat is included in the exhaust gas, its recovery is very important to improve the power system efficiency. Based on the previous basic studies, a thermal hydraulic prediction method for latent heat recovery exchangers was proposed. For the condensation of steam on heat transfer tubes, the modified Sherwood number taking account of the mass absorption effect on the wall was used. Two kinds of compact heat exchanger with staggered banks of bare tubes of 10.5 or 4mm in outer diameter was designed with the prediction method. The more compactness was obtained with the smaller tubes at a designed heat recovery. The thermal hydraulic behavior in the compact heat exchangers was experimentally studied with air-steam mixture gas. In the parametric experiments varying the steam mass concentration, the temperature distributions of cooling water and mixture gas were measured. The experimental results agreed well with the prediction proposed in this study and the more compactness with the smaller tubes was proved.

Experimental Study on Compact External Heat Exchanger for a 4 MWth Circulating Fluidized Bed Combustor

2013 ◽  
Vol 448-453 ◽  
pp. 3259-3269
Author(s):  
Zhi Wei Li ◽  
Hong Zhou He ◽  
Huang Huang Zhuang
Keyword(s):  
Heat Transfer ◽  
Heat Exchanger ◽  
Fluidized Bed ◽  
Heat Transfer Rate ◽  
Transfer Rate ◽  
Cooling Water ◽  
External Heat ◽  
Circulating Ash ◽  
Fluidized Bed Combustor ◽  
External Heat Exchanger

The characteristics of the external heat exchanger (EHE) for a 4 MWth circulation fluidized bed combustor were studied in the present paper. The length, width and height of EHE were 1.5 m, 0.8 m and 9 m, respectively. The circulating ash flow passing the heating surface bed could be controlled by adjusting the fluidizing air flow and the heating transferred from the circulating ash to the cooling water. The ash flow rate passing through the heat transfer bed was from 0.4 to 2.2 kg/s. The ash average temperature was from 500 to 750 °C. And the heat transfer rate between the ash and the cooling water was between 150 and 300 W/(m2·°C). The relationships among the circulating ash temperature, the heat transfer, heat transfer rate, the heat transfer coefficient and the circulating ash flow passing through the heating exchange cell were also presented and could be used for further commercial EHE design.

scholarly journals Serangan Korosi Sumuran pada Tube Heat Exchanger di Kilang Pengolahan Minyak

2019 ◽  
Vol 8 (3) ◽  
pp. 107-114
Author(s):  
Hadi Sunandrio ◽  
Sutarjo
Keyword(s):  
Heat Exchanger ◽  
Pitting Corrosion ◽  
Visual Inspection ◽  
Outer Tube ◽  
Oil Refinery ◽  
Composition Analysis ◽  
Heat Exchanger Tube ◽  
Corrosion Attack ◽  
Tube Heat Exchanger ◽  
Exchanger Tube

Alat penukar panas (Heat Exchanger) adalah suatu alat yang berfungsi untuk menaikkan temperatur. Apabila salah satu komponen dari Heat Exchangertersebut mengalami kerusakan, maka temperatur yang diinginkan tidak akan tercapai. Salah satu dari tube heat exchanger yang ada di Kilang Pengolahan Minyak mengalami kerusakan berupa putus akibat terkorosi. Setelah dilakukan pemeriksaan dan pengujian yang meliputi : pemeriksaan visual, metalografi, uji kekerasan, analisa komposisi kimia, dan analisa EDAX. Maka diketahui bahwatube Heat Exchanger telah mengalami serangan korosi sumuran (pitting corrosion) pada permukaan dalam dan luar tube. Terjadinya serangan korosi sumuran, karena pada permukaan dalam dan luar tube terlapisi oleh deposit yang cukup tebal dan mengandung unsur-unsur Sulphur (S) dan Chlor (Cl) yang dapat memicu timbulnya serangan korosi sumuran (pitting corrosion), hingga tube mengalami penipisan di mana-mana dan putus.Kata kunci : Alat penukar panas, Tube, Endapan, Korosi sumuran, putus.AbstractHeat exchangers is a tool that serves to raise the temperature. If one component of the Heat Exchanger is damaged, then the desired temperature will not be reached. One of the tube heat exchanger that is in Oil Refinery suffered damage in the form of broken due to corroded. After examination and testing that includes visual inspection, metallography, hardness testing, chemical composition analysis, and analysis of EDAX. It is known that the tube Heat Exchanger has suffered attacks pitting corrosion on the surface of the inner and outer tube. Pitting corrosion attack, because the surface of inner and outer tube coated by a deposit that is thick and contains elements of Sulphur (S) and Chlor (Cl) which can lead to pitting corrosion attack, to experience thinning tube where everywhere and brokenKeyword : Heat exchanger, Tube, Deposit, Pitting corrosion, Broken.

Statistical Analysis of Pitting Corrosion Field Data and Their Use for Realistic Reliability Estimations in Non-Piggable Pipeline Systems

CORROSION ◽  
10.5006/1195 ◽  
2014 ◽  
Vol 70 (11) ◽  
pp. 1090-1100 ◽  
Author(s):  
Alma Valor ◽  
Francisco Caleyo ◽  
Lester Alfonso ◽  
Julio Vidal ◽  
José M. Hallen
Keyword(s):  
Statistical Analysis ◽  
Pitting Corrosion ◽  
Field Data ◽  
Pipeline Systems
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