Reheater tubes shields

[wayuu1981]

we want to add tube shields to the reheater tube-panels of a 160 MW coal fired utility, C-E desing.

We are planning to install the shields covering 180 degrees from the tube, on the firt tube of each panel for abrasive protection, and all tubes exposed directly to the sootblowers steam flow within 2.5 ft.

Would it be enough protection to longer the RH tube's live? what kind of material and thickness will be adecuate for this job? considering the reheated steam temperature is 1000 F, and the tubes are 2" diameter, 0.135"-0.180" thick.

Javier Guevara E.
Projects, Mechanical Engineer
TERMOGUAJIRA - GECELCA S.A. E.S.P.

 

[metengr]

Yes. Normal tube shields in this location of the boiler are 310 stainless steel, 20 gage in thickness. Do not tack weld both ends, use a strap on one end and tack weld or plug weld the opposite end.

 

[wayuu1981]

I've found some information about tube shields already installed in Boiler 1 for sootblower area and they are SUS310, 4mm (5/32") Thick. I inspected them today and I found they are in a good shape but the installed on the first tube of primary reheater that are buckled. Should we need a different material for these tubes particularly? are the shields installed too thick? they are the same installed by mitsubishi 20 years ago.

Based on your response we will select the shields for soot blower area on boiler 2 and for ash abrasion protection in both units.

Javier Guevara E.
Projects, Mechanical Engineer
TERMOGUAJIRA - GECELCA S.A. E.S.P.