You need JavaScript to view this

Ash deposition and high temperature corrosion at combustion of aggressive fuels

Abstract

In order to reduce CO{sub 2} emission, ELSAM is investigating the possibilities of using biomass - mainly straw - for combustion in high efficiency power plants. As straw has very high contents of chlorine and potassium, a fuel with high corrosion and ash deposition propensities has been introduced. ELSAM has investigated 3 ultra supercritical boiler concepts for combustion of straw alone or together with coal: (1) PF boilers with a relatively low share of straw, (2) CFB boilers with low to high share of straw and (3) vibrating grate boilers with 100% straw. These investigations has mainly been full-scale tests with straw fed into existing boilers. Corrosion tests have been performed in these boilers using temperature regulated probes and in-plant test tubes in existing superheaters. The corrosion has been determined by detailed measurements of wall thickness reduction and light optical microscopic measurements of the material degradation due to high temperature corrosion. Corrosion mechanisms have been evaluated using SEM/EDX together with thermodynamical considerations based on measurements of the chemical environment in the flue gas. Ash deposition is problematic in CFB boilers and in straw fired boilers, especially in years with high potassium and chlorine content of the straw. This ash deposition  More>>
Authors:
Hede Larsen, O; [1]  Henriksen, N [2] 
  1. I/S Fynsvaerket, Faelleskemikerne, Odense (Denmark)
  2. Elsamprojekt A/S, Faelleskemikerne, Fredericia (Denmark)
Publication Date:
Dec 01, 1996
Product Type:
Conference
Report Number:
NEI-DK-2465; CONF-9609282-
Reference Number:
SCA: 360105; 200202; PA: DK-96:001777; EDB-96:171272; SN: 96001697006
Resource Relation:
Conference: International conference on power plant chemical technology, Kolding (Denmark), 4-6 Sep 1996; Other Information: PBD: 1996; Related Information: Is Part Of Power plant chemical technology; PB: 357 p.
Subject:
36 MATERIALS SCIENCE; 20 FOSSIL-FUELED POWER PLANTS; CORROSION; FLUIDIZED BED BOILERS; STRAW; ASHES; SUPERHEATERS; COMBUSTION KINETICS; POTASSIUM; CHLORINE; MATERIALS TESTING; COAL
OSTI ID:
399384
Research Organizations:
Faelleskemikerne (Denmark)
Country of Origin:
Denmark
Language:
English
Other Identifying Numbers:
Other: ON: DE97714817; TRN: DK9601777
Availability:
OSTI as DE97714817
Submitting Site:
DK
Size:
pp. 7.1-7.18
Announcement Date:

Citation Formats

Hede Larsen, O, and Henriksen, N. Ash deposition and high temperature corrosion at combustion of aggressive fuels. Denmark: N. p., 1996. Web.
Hede Larsen, O, & Henriksen, N. Ash deposition and high temperature corrosion at combustion of aggressive fuels. Denmark.
Hede Larsen, O, and Henriksen, N. 1996. "Ash deposition and high temperature corrosion at combustion of aggressive fuels." Denmark.
@misc{etde_399384,
title = {Ash deposition and high temperature corrosion at combustion of aggressive fuels}
author = {Hede Larsen, O, and Henriksen, N}
abstractNote = {In order to reduce CO{sub 2} emission, ELSAM is investigating the possibilities of using biomass - mainly straw - for combustion in high efficiency power plants. As straw has very high contents of chlorine and potassium, a fuel with high corrosion and ash deposition propensities has been introduced. ELSAM has investigated 3 ultra supercritical boiler concepts for combustion of straw alone or together with coal: (1) PF boilers with a relatively low share of straw, (2) CFB boilers with low to high share of straw and (3) vibrating grate boilers with 100% straw. These investigations has mainly been full-scale tests with straw fed into existing boilers. Corrosion tests have been performed in these boilers using temperature regulated probes and in-plant test tubes in existing superheaters. The corrosion has been determined by detailed measurements of wall thickness reduction and light optical microscopic measurements of the material degradation due to high temperature corrosion. Corrosion mechanisms have been evaluated using SEM/EDX together with thermodynamical considerations based on measurements of the chemical environment in the flue gas. Ash deposition is problematic in CFB boilers and in straw fired boilers, especially in years with high potassium and chlorine content of the straw. This ash deposition also is related to condensation of KCl and can probably only be handled by improved cleaning devices. (EG)}
place = {Denmark}
year = {1996}
month = {Dec}
}