Pilot test validation of the Coal Fouling Tendency model
Technical Report
·
OSTI ID:83325
- Massachusetts Institute of Technology, Cambridge, MA (United States); and others
Advances in our understanding of the details of chemical and physical processes of deposit formation in pulverized coal-fired boiler plant have led to the development at MIT of a Coal Fouling Tendency (CFT) computer code. Through utilization of a number of mathematical models and computer sub-codes, The CFT is capable of predicting the relative fouling tendency of coals. The sub-models interpret computer controlled scanning electron microscope analysis data in terms of mineral size and chemical composition distributions; follow the transformation of these mineral property distribution during the combustion of the coal; determine the probability of the resultant fly ash particles impacting on boiler-tube surfaces and of their sticking upon impaction. The sub-models are probabilistic, and take account of the particle-to-particle variation of coal mineral matter and fly ash properties by providing mean values and variances for particle size, chemical composition and viscosity. Results of an independent pilot test to validate the predictions of the CFT code are presented in this publication based on experimental data obtained in the Combustion Research Facility of the ABB-Combustion Engineering, a 3 MW furnace capable of simulating combustion conditions in utility boilers. Using various pulverized coals and coal blends as fuel, measurements were taken of the fly ash deposition on tubes inserted in the flame tunnel. Deposit formations were monitored for periods of several hours in duration on stainless steel tubes. The predictions of the CFT model were tested experimentally on four coals. The measured size and calculated viscosity distributions of fly ash were compared with predictions and good agreement was obtained. CFT predictions were also calculated for fly ash deposition rates over a wide temperature range. Based on these results, the relative fouling tendencies of the tested coals were given and compared with the pilot and field test results.
- Research Organization:
- Electric Power Research Inst., Palo Alto, CA (United States); Reaction Engineering International, Salt Lake City, UT (United States)
- OSTI ID:
- 83325
- Report Number(s):
- EPRI-TR--104982; CONF-9408200--
- Country of Publication:
- United States
- Language:
- English
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