Moving-bed gasification - combined-cycle control study. Volume 1: results and conclusions, Case 1 - air-blown dry-ash operation. Final report

Technical Report · Sun Mar 01 04:00:00 EST 1981

DOI:https://doi.org/10.2172/6860683· OSTI ID:6860683

Ahner, D. J.; Brower, A. S.; Dawes, M. H.; Patel, A. S.

A simulation study has been conducted to investigate the inherent process dynamics and required control strategies for an integrated coal gasification/combined cycle (GCC) power plant to operate successfully under load-changing conditions to meet power system requirements. The simulated GCC plant configuration is similar to the flowsheet developed in earlier EPRI economic studies (RP239), based on an air-blown, dry-ash, moving-bed gasifier of the Lurgi-type. A following GCC plant control study will be based on a Lurgi-type gasifier modified for oxygen-blown, slagging operations such as that being developed by British Gas Corporation. A large ditial computer simulation model of the GCC plant operating on a large utility power system network was developed to examine alternate plant control strategies. Gas turbine-lead and gasifier-lead control modes were evaluated with respect to power system requirements for daily load following, tie-line flow regulation with thermal backup, and frequency regulation. Inherent features of the gasifier led to unique process dynamics for the GCC plant. Sizeable transients were observed during load-changing operations, both in the fuel process and the steam system. However, the plant compensated effectively for such transients with a modified gas turbine-lead control strategy, by making use of fast-responding gas turbine controls and the large inherent volume of the fuel process. The results verify the capability of the GCC plant to operate with the fuel process closely integrated with the combined cycle plant under rapidly changing conditions. Furthermore, a GCC plant control strategy was developed which can successfully meet power sytem requirements within fuel system limitations, allowing an overall plant response rate of four (4) percent per minute.

• Research Organization: General Electric Co., Schenectady, NY (USA)
• OSTI ID: 6860683
• Report Number(s): EPRI-AP-1740(Vol.1)
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010404* -- Coal
Lignite
& Peat-- Gasification
20 FOSSIL-FUELED POWER PLANTS
200100 -- Fossil-Fueled Power Plants-- Power Plants & Power Generation
COAL GASIFICATION
COMBINED-CYCLE POWER PLANTS
COMPARATIVE EVALUATIONS
COMPUTERIZED SIMULATION
CONTROL SYSTEMS
DATA
DIAGRAMS
EXPERIMENTAL DATA
GASIFICATION
INFORMATION
NUMERICAL DATA
POWER PLANTS
SIMULATION
THERMAL POWER PLANTS
THERMOCHEMICAL PROCESSES
TRANSIENTS