The Paton Welding Journal, 2015, №01



2015 №01 (06)

DOI of Article 10.15407/tpwj2015.01.07

2015 №01 (08)

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The Paton Welding Journal, 2015, #1, 43-48 pages  

PECULIARITIES OF WELDING AND CONTROL IN MANUFACTURE OF HEAT-EXCHANGE MODULES OF EXHAUST-HEAT BOILER OF STEAM-GAS ELECTRIC PLANT OF 150 MW CAPACITY

A.K. Tsaryuk¹, V.P. Elagin¹, E.A. Davydov¹, A.R. Gavrik¹, A.I. Pasechnik², S.A. Polonets², V.G. Dedov³ And V.P. Gorelov³

¹E.O. Paton Electric Welding Institute, NASU. 11 Bozhenko Str., 03680, Kiev, Ukraine. E-mail: office@paton.kiev.ua
²«Donetskenergoremont» Ltd. 1 Umov Str., 83008, Donetsk, Ukraine. E-mail: postmaster@er/donetsk/ua
³Company «Alchevsk Iron & Steel Works». 4 Shmidt Str., 94202, Alchevsk, Lugansk region, Ukraine. E-mail: amk@amk.lg.ua
 
 
Abstract
Manufacture of exhaust-heat boiler of steam-gas plant of 150 MW capacity for Alchevsk Iron & Steel Works allowed using the secondary metallurgical gases as alternative to the nature gas. Its modular design, high closeness of arrangement in heat-exchange blocks of thin-walled small-diameter pipes of heating surfaces decreased the dimensions of the plant and increased its efficiency factor up to 44.6 %. Due to a narrow gap between the pipes the butts of these pipes occurred to be hard-to-reach for welding and control. This caused the increase in the amount of inadmissible defects in welds, and also made the welded joints of pipes almost not suitable for the repair. The making of welded joints on different stands by applying methods of argon-arc and combined welding allowed improving the quality, gave an opportunity to perform repair and to realize their X-ray, ultrasonic and visual-optic control. The manufactured heat-exchange blocks withstood the hydraulic test without appearance of leakage in welded joints, were installed and put into service. 3 Ref., 1 Table, 5 Figures.
 
 
Keywords: secondary gas fuels, steam-gas plant, heat-exchange blocks, piping of heating surfaces, header, arc welding, quality control
 
 
Received:                20.11.14
Published:               28.02.15
 
 
References
1. Falkov, M.I. (2007) Increase in power efficiency of application of by-product fuels on iron industry enterprises. Electron journal EXPO of power service company «Ecological systems», 6. http://www. esco-ecosys.narod.ru/2007_6/art103/.thm
2. Fomina, O. (2014) Application of blast-furnace, converter, coke gases in combined-cycle plants contribute to reduce electric power consumption of national power network on metallurgical works. http://masters.donntu.org/2011/feht/tovshchik/library/article7.htm
3. RTM-1s-89: Guiding technical document. Welding, heat treatment and control of pipe systems of boilers and pipelines in erection and repair of power plant equipment. Moscow: NPO OBT.

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