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US 8,756,938 B2Granted
Gas compressor operating method and gas turbine equipped with gas compressor
AssigneeMitsubishi Heavy Industries, Ltd.
InventorsJun Sasahara, Masamitsu Okuzono
Life of this patent
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Abstract
In a method for operating a gas compressor which compresses gas whose supply conditions change and which is equipped with an intake-flow regulating mechanism, a limit pressure ratio that defines the operational upper limit of the pressure ratio relative to the intake flow rate of the gas compressor or the degree of opening of the intake-flow regulating mechanism to prevent surging in the gas compressor is corrected by multiplying a reference limit pressure ratio calculated from the design conditions of the gas compressor by a first correction factor calculated depending on a detected operating-state value of the gas compressor.
Claims13
A method for operating a gas compressor which compresses gas whose supply conditions change and which is equipped with an intake-flow regulating mechanism, said method comprising:
- determining a reference limit pressure ratio based on design conditions of the gas compressor;
- detecting an operating-state value of the gas compressor;
- determining a first correction factor based on the detected operating-state value;
- deriving a corrected limit pressure ratio by correcting the reference limit pressure ratio using the first correction factor;
- and
- operating the gas compressor using the corrected limit pressure ratio,
- wherein each of the reference limit pressure ratio and the corrected limit pressure ratio defines an operational upper limit of a pressure ratio relative to an intake flow rate of the gas compressor or a degree of opening of the intake-flow regulating mechanism to prevent surging in the gas compressor, and
- wherein the first correction factor is obtained from a correcting rotational speed ratio (α) obtained from the following [Eq. 1], where N0 is a reference rotational speed of the gas compressor, κ0 is a reference specific heat ratio of the intake gas to the gas compressor, R0 is a reference gas constant of the intake gas to the gas compressor, T0 is a reference temperature of the intake gas to the gas compressor, N is an actual rotational speed of the gas compressor, κ is a present specific heat ratio of the intake gas to the gas compressor, R is a present gas constant of the intake gas to the gas compressor, and T is a present temperature of the intake gas to the gas compressor.
- Correcting
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- rotational
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- speed
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- ratio
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- α
- =
- N
-
- κ
- 0
-
- R
- 0
-
- T
- 0
- N
- 0
-
- κ
-
-
- RT
- .
- [
- Eq
- .
-
- 1
- ]
43 more elements
A method for operating a gas compressor which compresses gas whose supply conditions change and which is equipped with an intake-flow regulating mechanism, said method comprising:
- determining a reference limit pressure ratio based on design conditions of the gas compressor;
- detecting an operating-state value of the gas compressor;
- determining a first correction factor based on the detected operating-state value;
- deriving a corrected limit pressure ratio by correcting the reference limit pressure ratio using the first correction factor;
- and
- operating the gas compressor using the corrected limit pressure ratio,
- wherein each of the reference limit pressure ratio and the corrected limit pressure ratio defines an operational upper limit of a pressure ratio relative to an intake flow rate of the gas compressor or a degree of opening of the intake-flow regulating mechanism to prevent surging in the gas compressor,
- wherein the first correction factor is calculated from an intake gas temperature of the gas compressor,
- wherein in the calculation of the first correction factor, a gas constant (R) and a specific heat ratio (κ) of the intake gas to the gas compressor are included, and
- wherein the gas constant (R) and the specific heat ratio (κ) of the intake gas to the gas compressor are calculated from a gas composition measured at the inlet side of the gas compressor.
7 more elements
A method for operating a gas compressor which compresses gas whose supply conditions change and which is equipped with an intake-flow regulating mechanism, said method comprising:
- determining a reference limit pressure ratio based on design conditions of the gas compressor;
- detecting an operating-state value of the gas compressor;
- determining a first correction factor based on the detected operating-state value;
- deriving a corrected limit pressure ratio by correcting the reference limit pressure ratio using the first correction factor;
- and
- operating the gas compressor using the corrected limit pressure ratio,
- wherein each of the reference limit pressure ratio and the corrected limit pressure ratio defines an operational upper limit of a pressure ratio relative to an intake flow rate of the gas compressor or a degree of opening of the intake-flow regulating mechanism to prevent surging in the gas compressor,
- wherein the first correction factor is calculated from an intake gas temperature of the gas compressor,
- wherein in the calculation of the first correction factor, a gas constant (R) and a specific heat ratio (κ) of the intake gas to the gas compressor are included, and
- wherein the gas constant (R) and the specific heat ratio (κ) of the intake gas to the gas compressor are calculated from a gas composition obtained by conversion from a gas density or the amount of gas generated, which is measured at the inlet side of the gas compressor.
7 more elements
A method for operating a gas compressor which compresses gas whose supply conditions change and which is equipped with an intake-flow regulating mechanism, said method comprising:
- determining a reference limit pressure ratio based on design conditions of the gas compressor;
- detecting an operating-state value of the gas compressor;
- determining a first correction factor based on the detected operating-state value;
- deriving a corrected limit pressure ratio by correcting the reference limit pressure ratio using the first correction factor;
- and
- operating the gas compressor using the corrected limit pressure ratio,
- wherein each of the reference limit pressure ratio and the corrected limit pressure ratio defines an operational upper limit of a pressure ratio relative to an intake flow rate of the gas compressor or a degree of opening of the intake-flow regulating mechanism to prevent surging in the gas compressor,
- wherein the first correction factor is calculated from an intake gas temperature of the gas compressor,
- wherein in the calculation of the first correction factor, a gas constant (R) and a specific heat ratio (κ) of the intake gas to the gas compressor are included, and
- wherein if the intake gas to the gas compressor is a gas in which a plurality of gases are mixed, a gas constant (R) and a specific heat ratio (κ) after mixing are obtained from the compositions and flow ratio between the individual gases.
7 more elements
A method for operating a gas compressor which compresses gas whose supply conditions change and which is equipped with an intake-flow regulating mechanism, said method comprising:
- determining a reference limit pressure ratio based on design conditions of the gas compressor;
- detecting an operating-state value of the gas compressor;
- determining a first correction factor based on the detected operating-state value;
- deriving a corrected limit pressure ratio by correcting the reference limit pressure ratio using the first correction factor;
- and
- operating the gas compressor using the corrected limit pressure ratio,
- wherein each of the reference limit pressure ratio and the corrected limit pressure ratio defines an operational upper limit of a pressure ratio relative to an intake flow rate of the gas compressor or a degree of opening of the intake-flow regulating mechanism to prevent surging in the gas compressor, and
- wherein the intake flow rate of the gas compressor is a corrected flow rate Q0 (the unit is volume flow rate) obtained from the following [Eq. 2], where Q is an actual intake flow rate of the gas compressor (the unit is volume flow rate), N0 is a reference rotational speed of the gas compressor, κ0 is a reference specific heat ratio of the intake gas to the gas compressor, R0 is a reference gas constant of the intake gas to the gas compressor, T0 is a reference temperature of the intake gas to the gas compressor, N is an actual rotational speed of the gas compressor, κ is a present specific heat ratio of the intake gas to the gas compressor, R is a present gas constant of the intake gas to the gas compressor, and T is a present temperature of the intake gas to the gas compressor, or a corrected flow rate G0 (the unit is mass flow rate) obtained from the following [Eq. 3], where G is an actual intake flow rate of the gas compressor (the unit is mass flow rate), N0 is a reference rotational speed of the gas compressor, κ0 is a reference specific heat ratio of the intake gas to the gas compressor, R0 is a reference gas constant of the intake gas to the gas compressor, T0 is a reference temperature of the intake gas to the gas compressor, N is an actual rotational speed of the gas compressor, κ is a present specific heat ratio of the intake gas to the gas compressor, R is a present gas constant of the intake gas to the gas compressor, and T is a present temperature of the intake gas to the gas compressor.
- Corrected
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- flow
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- rate
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- Q
- 0
- =
- Q
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- κ
- 0
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- R
- 0
-
- T
- 0
- κ
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-
- RT
- [
- Eq
- .
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- 2
- ]
- Corrected
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- flow
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- rate
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- G
- 0
- =
- G
- ·
- κ
- 0
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- RT
- κ
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- R
- 0
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- T
- 0
- P
- /
- P
- 0
- .
- [
- Eq
- .
-
- 3
- ]
74 more elements
Dependencies are inferred from the claim text.