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Indexed by:期刊论文

Date of Publication:2012-11-01

Journal:APPLIED THERMAL ENGINEERING

Included Journals:SCIE、EI、Scopus

Volume:44

Page Number:57-68

ISSN No.:1359-4311

Key Words:Numerical modelling; Ash deposition; Deposition distribution; CFD model; Ash melting curve

Abstract:Ash related problems such as fouling and slagging are crucial for operation of the heat recovery steam generator (HRSG) of the wastewater incinerator. In this paper, numerical studies of the characteristics of ash particle deposition and distribution under different operating conditions in the HRSG of a wastewater incinerator have been performed using numerical deposition model coupled with gas-solid two phase turbulent flow model. Based on ash melting thermo-analysis and critical moment theory, a numerical deposition model was adopted to predict ash particle sticking and rebounding in the thermal boundary layer, as well as shedding of deposited particles from tube surfaces, using the commercial computational fluid dynamic code FLUENT 6.3.26. Field measurements from an industrial-scale HRSG of the wastewater incinerator in Acrylic Fiber Plant, Sinopec Qilu Petrochemical Corporation Group, China, have been used to validate the model. The predicted results under different operating conditions are in good agreement with the measured data. The results show that ash deposition and distribution have significant particle size and temperature dependence. Strong deposition propensity of large particles on the windward side of tube surfaces should be responsible for the formation of serious fouling deposits near the entrance of the furnace. High temperature will accelerate ash particle deposition in the furnace. (c) 2012 Elsevier Ltd. All rights reserved.