Magyar változat

Cast-iron finned tubes

Special hexagonal and quadrangular cast-iron finned tubes are manufactured by Technológia Mérnöki Iroda Kft, Budapest. The cast-iron elements are 200 mm long and they consist of hexagonal or quadrangular finned parts beaded with clearance fit to a carbon or stainless steel and with high pressure expanded to assure the metal-to-metal contact between the iron cast and the core tube.

Cast-iron finned tubes are employable in the following circumstances:
Heat recovery of high temperature max (700 °C) corrosive and erosive smoke gas, under dew point outlet temperature,
Heat recovery from waste heat of incinerator and dangerous waste burner plants,
In feed water pre-heater of coal, oil and gas burning economisers,
For industrial heating tube registers.

Mean technique parameters:

Coring tube

Material: St. 37.4, St 35.8 I-III, stainless steel

Dimensions: normal steel stainless steel
Ø25 x 2,6 Ø25 x 2
Ø38 x 2,6 Ø38 x 2
Ø57 x 2,6 Ø57 x 2

Cast iron finned tubes:

Core tube (mm) Ø25 Ø38 Ø57 Ø57
Dimension of the fins 60 hexagonal 95 x 95 120 x 145 145 x 145
Pitch of the fins (mm) 11,1 15,4 10 12,5
Number of fins (fin/m) 90 60 100 80
Mass (kg/m) 12 19,5 43 53
Inside heat-transfer surface (m2/m) 0,0625 0,104 0,160 0,160
Surface relation 9,7 10,2 18,7 19,1
Outside heat-transfer surface (m2/m) 0,606 1,06 3 3,05
Pitch of the tubes
In the direction of the gas flow 65 100 150 150
Perpendicular to the direction of the gas flow 75 100 130 150
Overall heat transfer coefficient to the inside surface (W/m2K) by creating heat water by 0,5 m/s water velocity if the flue gas velocity is:
4 m/s 420 440 800 800
5 m/s 480 500 900 900
6 m/s 530 550 990 990
 
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