Analysis of failed superheater tubing from the Mountain Fuel Resources Coal Gasification PDU

Technical Report · Sat Oct 01 04:00:00 EDT 1983

OSTI ID:5166120

Diercks, D R

A sample of failed superheater tubing from the Mountain Fuel Resources Coal Gasification PDU has been analyzed. The sample consisted of a length of 1-1/4 in. Schedule 80 Incoloy 800H pipe circumferentially cracked near a weld to an adjacent 2-1/4Cr-1Mo steel elbow. The failure was attributed to intergranular stress corrosion cracking of the sensitized Incoloy 800H near the weld. The corrosive species responsible for the failure were water-soluble chlorides and sulfates present in the soot and ash deposit on the outside of the tubing. The necessary tensile stresses were provided by the residual stresses present in the region of the dissimilar-metal weld. The results of the failure analyses indicate that further failures of this type can be prevented by avoiding condensation at the outer surface of the superheater, particularly during plant startup. This could be accomplished either by maintaining the superheater at temperatures above about 72/sup 0/C (162/sup 0/F) during startup or by venting the wet combustion product gases produced during startup before they reach the waste heat recovery system. 12 references, 10 figures, 1 table.

• Research Organization: Argonne National Lab., IL (USA)
• DOE Contract Number: W-31109-ENG-38
• OSTI ID: 5166120
• Report Number(s): ANL/FE-83-26; ON: DE84009116
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
ALLOYS
ASHES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
COAL GASIFICATION
COAL GASIFICATION PLANTS
CORROSION
CORROSIVE EFFECTS
DATA
EXPERIMENTAL DATA
FAILURES
FUNCTIONAL MODELS
GASIFICATION
HALIDES
HALOGEN COMPOUNDS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
INCOLOY 800
INCOLOY ALLOYS
INDUSTRIAL PLANTS
INFORMATION
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
NICKEL ALLOYS
NUMERICAL DATA
OXYGEN COMPOUNDS
PIPES
PROCESS DEVELOPMENT UNITS
RESIDUES
SOOT
STRESS CORROSION
SULFATES
SULFUR COMPOUNDS
SUPERHEATERS
THERMOCHEMICAL PROCESSES
TUBES