Delay time calculation method and gas turbine control method, and delay time calculation apparatus and control apparatus for gas turbine

Patent metadata

Field	Value
Publication number	US-12196142-B2
Application number	US-202318490361-A
Country	US
Kind code	B2
Filing date	Oct 19, 2023
Priority date	Nov 7, 2022
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

A delay time calculation method includes: a step of calculating a plurality of segment movement delay times respectively indicating times required for the fuel gas to pass through a plurality of segments; a step of calculating a total movement delay time which is a time required for the fuel gas to move through the fuel line from the measurement point to the supply target device, by adding up the plurality of segment movement delay times; and a step of acquiring the delay time based on the total movement delay time. The step of calculating the plurality of segment movement delay times includes acquiring the segment movement delay time based on a correlation between the segment movement delay time acquired in advance and a fuel flow rate supplied to the supply target device, for each of the plurality of segments.

First claim

The invention claimed is:

1. A method for calculating a delay time in a facility including a fuel line for introducing a fuel gas to a supply target device, and a calorimeter for measuring a calorie of the fuel gas obtained from a measurement point of the fuel line,
the delay time indicating a time difference between when the calorie of the fuel gas is measured by the calorimeter and when the fuel gas reaches the supply target device,
the fuel line including a plurality of segments obtained by dividing the fuel line between the measurement point and the supply target device,
the delay time calculation method comprising:
calculating a plurality of segment movement delay times, each segment movement delay time indicating a time required for the fuel gas to pass through a respective segment of the plurality of segments;
calculating a total movement delay time which is a time required for the fuel gas to move through the fuel line from the measurement point to the supply target device, by adding up the plurality of segment movement delay times; and
acquiring the delay time based on the total movement delay time,
wherein the calculating of the plurality of segment movement delay times includes, for each respective segment of the plurality of segments, acquiring the segment movement delay time based on a correlation between the segment movement delay time and a fuel flow rate supplied to the supply target device, the correlation between the segment movement delay time and the fuel flow rate being acquired in advance, and
wherein the acquiring of the delay time includes acquiring the total movement delay time as the delay time, or calculating the delay time by subtracting a time required to measure the calorie of the fuel gas with the calorimeter from the total movement delay time.

2. The method according to claim 1 , further comprising:
correcting a segment movement delay time of the plurality of calculated segment movement delay times with a temperature or a pressure of the fuel gas in the respective segment,
wherein the calculating of the total movement delay time includes calculating the total movement delay time by using the corrected segment movement delay time.

3. The method according to claim 1 ,
wherein the facility includes a heater disposed in the fuel line and configured to heat the fuel gas, and
wherein the plurality of segments include a first segment including a section of the fuel line, which is located upstream of the heater relative to a flow direction of the fuel gas in the fuel line, and a second segment including a section of the fuel line, which is located downstream of the heater relative to the flow direction of the fuel gas.

4. The method according to claim 1 ,
wherein the facility includes a plurality of the supply target devices where the fuel gas is supplied,
wherein the fuel line includes a plurality of branch lines for respectively introducing the fuel gas to the plurality of supply target devices, the plurality of branch lines branching from a branch point in the fuel line,
wherein the measurement point is located upstream of the branch point relative to a flow direction of the fuel gas in the fuel line, and
wherein calculating of the plurality of segment movement delay times includes acquiring a segment movement delay time for a first segment of the plurality of segments based on a correlation between the segment movement delay time for the first segment and a total value of fuel flow rates supplied to the plurality of supply target devices, the first segment being upstream of the branch point in the fuel line, the correlation between the segment movement delay time for the first segment and the total value of fuel flow rates supplied to the plurality of supply target devices being acquired in advance.

5. The method according to claim 1 , comprising:
correcting at least one of the plurality of calculated segment movement delay times or the calculated total movement delay time with a density of the fuel gas.

6. A gas turbine control method, comprising:
controlling a gas turbine including a combustor as the supply target device, by using the delay time calculated by the method according to claim 1 .

7. A calculation apparatus for calculating a delay time in a facility including a fuel line for introducing a fuel gas to a supply target device, and a calorimeter for measuring a calorie of the fuel gas obtained from a measurement point of the fuel line,
the delay time indicating a time difference between when the calorie of the fuel gas is measured by the calorimeter and when the fuel gas reaches the supply target device,
the fuel line including a plurality of segments obtained by dividing the fuel line between the measurement point and the supply target device,
the calculation apparatus for calculating the delay time comprising:
a segment movement delay time calculation unit configured to calculate a plurality of segment movement delay times, each segment movement delay time indicating a time required for the fuel gas to pass through a respective segment of the plurality of segments;
a total movement delay time calculation unit configured to calculate a total movement delay time by adding up the plurality of segment movement delay times; and
a delay time acquisition unit configured to acquire the delay time based on the total movement delay time,
wherein the segment movement delay time calculation unit is configured to acquire, for each respective segment of the plurality of segments, the segment movement delay time based on a correlation between the segment movement delay time and a fuel flow rate supplied to the supply target device, the correlation between the segment movement delay time and the fuel flow rate being acquired in advance, and
wherein the delay time acquisition unit is configured to acquire the total movement delay time as the delay time, or to calculate the delay time by subtracting a time required to measure the calorie of the fuel gas with the calorimeter from the total movement delay time.

8. A control apparatus for a gas turbine, comprising:
the calculation apparatus for calculating the delay time according to claim 7 ; and
a control unit configured to control a gas turbine including a combustor as the supply target device, by using the delay time calculated by the calculation apparatus.

Assignees

• Mitsubishi Heavy Ind Ltd

Inventors

• Hatano Ken

Classifications

• F23N1/002 Primary

  using electronic means (F23N1/04 - F23N1/10 take precedence) · CPC title

• F05D2270/31

  Fuel schedule for stage combustors · CPC title

• F23N2221/10

  Analysing fuel properties, e.g. density, calorific · CPC title

• G01K17/00

  Measuring quantity of heat (measuring temperature by calorimetry G01K3/00 - G01K11/00; specially adapted for measuring thermal properties of materials, e.g. specific heat, heat of combustion G01N) · CPC title

• F02C9/26 Primary

  Control of fuel supply (F02C9/48 takes precedence; fuel valves F02C7/232) · CPC title