Solvent Refined Coal (SRC) Process. Quarterly technical progress report, April 1980-June 1980. [Thermal response of reactor to inlet temperature changes, multiple steady reaction states and control methods]

Technical Report · Wed Apr 01 00:00:00 EST 1981

OSTI ID:6421551

An estimate of the temperature gain, defined as the change in the reactor outlet temperature for a given change in inlet temperature made with the simplified CSTR model, indicates that the gain is about 4 for both P-99 and the demonstration plant. The estimate of gain is independent of reactor scale, and the value of gain agrees with the gains observed using the more comprehensive partially backmixed reactor model. The value of gain indicates a high level of sensitivity (coupling) between inlet and outlet temperatures. The CSTR model can be used in conjunction with data from the pilot plant to estimate the activation energy (E) for the point rate of hydrogen consumption, a key kinetics parameter which determines the gain. The value of E used in the model (18.8 kcal/gmole) was obtained from curve fits to pilot plant and CSTR data and is reasonable for this type of hydrogenolysis process. Some additional implications are: (1) The predicted temperature response profile shows that, in the absence of quench control, should the average temperature increase, it will continue to increase to a high temperature eventually reaching beyond the range of the model. Similarly, should conditions cause the temperature to drop, it would continue to drop until a lower stable steady state around 788/sup 0/F is reached. This lower steady state, one of low reactivity, is within the validity of the model. (2) A separate analysis not presented here indicates that the order of the hydrogen partial pressure dependence in the reaction rate also influences the stability, multiplicity, and gain at the steady state. This behavior was discussed in an earlier report.

• Research Organization: Pittsburg and Midway Coal Mining Co., Kansas City, MO (USA); Pittsburg and Midway Coal Mining Co., Englewood, CO (USA)
• DOE Contract Number: AC05-76ET10104
• OSTI ID: 6421551
• Report Number(s): DOE/ET/10104-5(Vol.2); ON: DE81026324
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
CHEMICAL REACTORS
TEMPERATURE CONTROL
SRC-II PROCESS
MATHEMATICAL MODELS
ACTIVATION ENERGY
ASHES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
COAL
COAL LIQUEFACTION
COAL LIQUEFACTION PLANTS
COAL LIQUIDS
CONSUMPTION RATES
DEMONSTRATION PLANTS
DESIGN
ENGINEERING
EXPERIMENTAL DATA
HYDROGEN
PROCESS DEVELOPMENT UNITS
RECOMMENDATIONS
STABILITY
YIELDS
CARBONACEOUS MATERIALS
CONTROL
DATA
ELEMENTS
ENERGY
ENERGY SOURCES
FLUIDS
FOSSIL FUELS
FUELS
FUNCTIONAL MODELS
INDUSTRIAL PLANTS
INFORMATION
KINETICS
LIQUEFACTION
LIQUIDS
MATERIALS
NONMETALS
NUMERICAL DATA
REACTION KINETICS
RESIDUES
THERMOCHEMICAL PROCESSES
010405* - Coal
Lignite
& Peat- Hydrogenation & Liquefaction