Combustion Engineering two-stage, atmospheric-pressure, entrained-flow coal-gasification-process development-unit program. Final report

Technical Report · Tue Feb 01 04:00:00 EST 1983

OSTI ID:6359025

Darling, S L; Koucky, R W; Tanca, M C

A program was conducted to design, construct and operate a two-stage, atmospheric-pressure, entrained-flow, low-Btu coal-gasification-process development unit (PDU) having a capacity of 5 tons/h of coal. The program was jointly sponsored by the US Department of Energy, the Electric Power Research Institute, and Combustion Engineering, Inc. The objectives of the program were: (1) to demonstrate the capability and suitability of the process and equipment to produce a clean-low-Btu gas from coal, and (2) to provide design information for scale-up to commercial-size plants. During the 3-y PDU test program, beginning in June 1978, a series of 12 runs was conducted. Pittsburgh seam coal was fired for 5085 h and clean fuel gas was produced for 3746 h. Product-gas higher heating values above 100 Btu/scf were observed during initial testing when gasifier thick-wall refractory was intact. However, refractory thickness decreased, causing higher vessel heat absorption and hence lower gas temperatures. Lower-than-design gasification kinetics for Pittsburgh seam coal char and higher-than-design vessel heat absorption resulted in lower char-gasification rates and decreased gas-heating values. As a result, when the gasifier was operated at the design feed rate of 10,000 lb/h, char inventory was not in balance and gas-heating values were generally less than 100 Btu/scf (averaging 80 Btu/scf). Several equipment and operating problems were identified, including poor refractory durability, char-feed-system limitations and slag tap blockage. A mathematical model was developed to provide a basis for scale-up to commercial-size gasifiers. The model was calibrated using experimental data from the PDU tests and bench-scale support studies. The major process concepts and gasifier design features were demonstrated in tests at reduced coal feed rates.

• Research Organization: Combustion Engineering, Inc., Windsor, CT (USA)
• DOE Contract Number: AC01-76ET10204
• OSTI ID: 6359025
• Report Number(s): EPRI-AP-2846; ON: DE83009252
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
BENCH-SCALE EXPERIMENTS
CALIBRATION
CALORIFIC VALUE
CARBON COMPOUNDS
CARBON OXYSULFIDE
CE ENTRAINED FUEL PROCESS
CHALCOGENIDES
CHARS
CHEMICAL REACTIONS
COAL GASIFICATION
COMBUSTION PROPERTIES
DATA
DECOMPOSITION
DIAGRAMS
ECONOMIC ANALYSIS
ECONOMICS
ENERGY LOSSES
EXPERIMENTAL DATA
FLOWSHEETS
FLUIDS
FUEL GAS
FUELS
FUNCTIONAL MODELS
GAS FUELS
GASES
GASIFICATION
HEAT LOSSES
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
HYDROLYSIS
INFORMATION
LOSSES
LOW BTU GAS
LYSIS
MATHEMATICAL MODELS
NUMERICAL DATA
PERFORMANCE
PROCESS DEVELOPMENT UNITS
PYROLYSIS PRODUCTS
REFRACTORIES
REMOVAL
SOLVOLYSIS
STRETFORD PROCESS
SULFIDES
SULFUR COMPOUNDS
THERMOCHEMICAL PROCESSES