Gas turbine control device and gas turbine control method

The gas turbine control device and method address the challenge of fluctuating co-firing ratios by adjusting reference values for interlock control based on combustibility index variations, ensuring effective prevention of flashback in both low and high co-firing ratio regions.

JP7893959B1Active Publication Date: 2026-07-22MITSUBISHI HEAVY IND LTD
View PDF 3 Cites 0 Cited by

Patent Information

Authority / Receiving Office
JP · JP
Patent Type
Patents
Current Assignee / Owner
MITSUBISHI HEAVY IND LTD
Filing Date
2025-11-13
Publication Date
2026-07-22

AI Technical Summary

Technical Problem

Gas turbines using mixed fuels face challenges in maintaining appropriate interlock control when co-firing ratios fluctuate due to disturbances, particularly in high-co-firing ratio regions, as traditional methods based on simple deviation comparisons may not adequately respond to the varying combustibility of mixed fuels.

Method used

A gas turbine control device and method that adjusts reference values for interlock control based on the combustibility index, distinguishing between first and second combustion ratio regions where the combustibility index of the mixed fuel decreases or increases with increasing combustion ratio, using a determination unit to compare the deviation in co-firing ratio with region-specific reference values.

Benefits of technology

Enables appropriate interlock control even in regions with fluctuating co-firing rates, preventing flashback occurrences by dynamically adjusting control thresholds based on the combustibility characteristics of mixed fuels.

✦ Generated by Eureka AI based on patent content.

Smart Images

  • Figure 0007893959000001_ABST
    Figure 0007893959000001_ABST
Patent Text Reader

Abstract

Whether the co-firing ratio is low or high, interlock control is appropriately implemented when the co-firing ratio fluctuates due to the influence of external disturbances. [Solution] This application relates to a gas turbine control device for controlling a gas turbine equipped with a fuel supply system that supplies a first mixed fuel of a first fuel and a second fuel to a first fuel nozzle. The gas turbine control device determines whether or not interlock control of the gas turbine is necessary by comparing the deviation between a target mixing ratio, which is a target value for the mixing ratio of the second fuel in the first mixed fuel, and the mixing ratio of the second fuel in the first mixed fuel, with a reference value. The reference value for determining whether interlock control is necessary differs between the first mixing ratio region, where the combustibility index of the first mixed fuel decreases with increasing mixing ratio, and the second mixing ratio region, where the combustibility index of the first mixed fuel increases with increasing mixing ratio.
Need to check novelty before this filing date? Find Prior Art

Citation Information

Patent Citations

  • System and method for blending and controlling fuel for combustion gas turbine

    JP2010156324A

  • Method and system for preventing combustion instability during transient operation

    JP2012092838A

  • Gas turbine control device, gas turbine control method, and gas turbine control program

    JP7403698B1