Effects of coal cleaning and slag rejection on the mass and composition of slag and seed in an MHD gas flow train

Technical Report · Mon Sep 01 04:00:00 EDT 1980

DOI:https://doi.org/10.2172/6704976· OSTI ID:6704976

As part of the MHD program, DOE is sponsoring efforts to define the design criteria and performance requirements for components downstream of the diffuser in an MHD gas flow train. The objectives of this study are to assess the effects of coal cleaning and combustor slag rejection on the mass flow rate and composition of the slag and seed in an MHD flow train. Included in this assessment is an evaluation of the impacts on the design and material selection for the downstream components. This assessment was done by using equilibrium calculations to define the mass fraction, chemical composition, and properties of the slag carryover as a function of coal type, coal cleaning method, and slag temperature. Until experimental data are available, equilibrium calculations provide the best indication of the environment in the downstream components. From a survey of the literature on physical cleaning of coals, the effect of cleaning on the ash composition of the MHD reference coals was correlated and this information was used to predict the composition of a cleaned MHD coal. Equilibrium calculations of the carryover from a raw and cleaned Montana Rosebud coal were made at selected state points of a specific MHD flow train (the DOE 200 MWe Baseline ETF cycle). In addition, three different levels of slag rejection were considered for the raw coal. Slag rejection was assumed to take place only at the first stage of the combustor. Liquid slag will be present in the radiant boiler and, in practice, some portion of the slag may be removed there. However, for this scoping study, no slag rejection in the radiant boiler was assumed. Results are presented and discussed.

• Research Organization: Gilbert Associates, Inc., Reading, PA (USA)
• DOE Contract Number: AC01-77ET11058
• OSTI ID: 6704976
• Report Number(s): GAI-2176
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010600 -- Coal
Lignite
& Peat-- Properties & Composition
013000 -- Coal
Lignite
& Peat-- Transport
Handling
& Storage
30 DIRECT ENERGY CONVERSION
300101* -- MHD Generators-- Design & Development
ASHES
BOILERS
CHEMICAL COMPOSITION
CLEANING
COAL PREPARATION
COAL-FIRED MHD GENERATORS
COMBINED-CYCLE POWER PLANTS
COMBUSTION PRODUCTS
COMBUSTION PROPERTIES
COMBUSTORS
COMMINUTION
DATA
DATA COMPILATION
DEPOSITS
DESIGN
DIRECT ENERGY CONVERTERS
EQUILIBRIUM
FLOW RATE
HEAT EXCHANGERS
INFORMATION
MATERIALS
MHD CHANNELS
MHD GENERATOR ETF
MHD GENERATORS
MHD POWER PLANTS
NUMERICAL DATA
POWER PLANTS
RECOVERY
RESIDUES
SEED RECOVERY
SEED-SLAG INTERACTIONS
SLAGS
SPENT SEED
TABLES
TEMPERATURE DEPENDENCE
THERMAL POWER PLANTS
VISCOSITY