JPH07180567A - Operation control device for fuel gas compressor - Google Patents

Abstract

PURPOSE:To reduce an auxiliary power for a plant through reduction of a wasteful operation time to zero. CONSTITUTION:Through detection of a pressure in the volume chamber 8 of a fuel gas pressure compressor 7, the boosting given time of a fuel gas compressor is calculated. From a given time starting from the start of the starting of a gas turbine 3 to ignition, the optimum starting timings of the gas turbine 3 and the fuel gas compressor 7 are calculated. Based on the calculating result, a starting command is outputted to the fuel gas compressor 7 and the gas turbine 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic start control device for a gas turbine power plant equipped with a fuel gas compressor,
In particular, it relates to an operation control device for a fuel gas compressor.

[0002]

2. Description of the Related Art FIG. 7 shows a conventional gas turbine power generation facility. Further, FIG. 8 shows a fuel gas pressurization curve. The fuel gas supplied at a constant supply pressure P ₁ is the fuel gas compressor facility 6
And is boosted by the fuel gas compressor 7 to the pressure required for the gas turbine (target gas pressure P _s ) and then enters the volume chamber 8. The volume chamber 8 is provided to prevent pulsation of the fuel gas pressure and to prevent sudden increase in the fuel gas pressure when the load is cut off. The fuel gas that has passed through the volume chamber 8 enters the combustor 4 of the gas turbine equipment 1, is mixed with the air compressed by the compressor 2, and is burned. The gas turbine 3 is driven by the energy obtained from the combustion gas, and rotates the generator 5 to generate electricity.

A gas turbine control device 10 is given a plant start command a. The gas turbine control device 10 gives a start command b to the fuel gas compressor control device 9. The fuel gas compressor control device 9 activates the fuel gas compressor equipment by the control signal d to boost the pressure of the fuel gas. After that, the gas turbine control device 10 starts the gas turbine equipment 1 by the control signal e to generate power.

[0004]

As shown in the fuel gas pressure boosting curve of FIG. 8, it takes time for the fuel gas compressor to start boosting and complete the boosting to the target pressure. On the other hand, since it is necessary to complete the pressure increase of the fuel gas before the ignition of the gas turbine, it is necessary to start the fuel gas compressor in time. Figure 8 shows how the pressure of conventional fuel gas is increased.
Curve 101 of FIG. When the plant start command a is output at time T ₁ , the gas turbine control device 10 outputs the fuel gas compressor start command b to the fuel gas compressor control device 9, and the fuel gas compressor 7 is started.

The fuel gas is supplied at a constant pressure P ₁ , and the fuel gas compressor 7 raises the pressure to a target gas pressure P _s . On the other hand, after (ΔT ₁ −ΔT ₄ ) has elapsed since the fuel gas compressor was started at time T ₁ , the gas turbine control device 10 starts the gas turbine. Here, the time ΔT ₁ required for the fuel gas compressor to pressurize the fuel gas at the supply pressure P ₁ to the target gas pressure P _s is constant, and the gas turbine is ignited after the start command is output to the gas turbine. Until ΔT ₄ is constant. Therefore, in the conventional example, the time from the activation of the fuel gas compressor to the activation of the gas turbine is always constant.

Here, in the case of starting from a completely initial state such as after periodic inspection of the plant or after long-term shutdown, the fuel gas is boosted from the supply pressure P _1. Therefore, when starting by the above method, gas turbine ignition occurs. At times, boosting of the fuel gas pressure is completed. However, at other times, since the residual pressure exists in the volume chamber installed downstream of the fuel gas compressor, the outlet fuel gas pressure of the fuel gas compressor is higher than the supply pressure P ₁ . A curve 102 in FIG. 8 shows a case where the fuel gas is pressurized from the fuel gas compressor outlet pressure P ₂ . In this case, since it is equivalent to starting the compression from the middle of the curve 101, the fuel gas pressurization required time ΔT ₂ becomes shorter than that of the curve 101. Therefore, the pressure of the fuel gas compressor is completed before the ignition of the gas turbine, and ΔT ₃ (= ΔT ₁ −
During ΔT ₂ ), useless standby operation is performed. It is an object of the present invention to eliminate this useless standby operation time and reduce the auxiliary machine power of the plant.

[0007]

According to the present invention, the pressure of the volume chamber and the fuel gas supply pressure are measured, and the time required until the pressure increase by the fuel gas compressor is completed is calculated, thereby waiting for the fuel gas compressor. The gas turbine and the fuel gas compressor are started so as to minimize the operation time.

[0008]

Since the boosting of the fuel gas by the fuel gas compressor is completed at the time of ignition required by the gas turbine, the wasteful standby operation time of the fuel gas compressor is minimized, and the auxiliary machine power can be reduced.

[0009]

FIG. 1 shows the configuration of an embodiment of the present invention. In the present embodiment, an automatic start control device 11 is added to the configuration of the conventional example shown in FIG. 7, the fuel gas boosting force required time by the fuel gas compressor is calculated from the pressure of the volume chamber 8, and the gas turbine control device is calculated. The fuel gas compressor start-up command b and the gas turbine start-up command c are given to the 10 and the fuel gas compressor control device 9 at appropriate times.

When the plant start command a is input, the automatic start control unit 11 obtains the volume chamber pressure f from the volume chamber pressure gauge 30 and boosts it at the time of ignition of the gas turbine from the function of the volume chamber pressure and the fuel gas boosting time shown in FIG. Calculate the fuel gas compressor start-up time when is completed. For example, the pressure in the volume chamber is P ₂
Then, from the curve 105 in FIG. 2, the time required for boosting the fuel gas can be calculated as ΔT ₂ . At this time, the fuel gas pressure is increased according to the curve 104 in FIG. Since the time ΔT ₄ required from the start of the gas turbine to the ignition is constant, the curve 10
Fuel gas compressor pressurization time ΔT ₂ and Δ
Compare T ₄ , start the one that takes time first, and
Start only after ΔT ₂ −ΔT ₄ |.

Since the pressure increase of the fuel gas is always completed when the gas turbine is ignited, it is possible to eliminate unnecessary standby operation time of the fuel gas compressor. In addition to the embodiment described above, FIG.
With the configuration shown in FIG. 5, the circuit can be configured as shown in the block diagram of FIG. This is a fuel gas supply pressure gauge 31
When the fuel gas supply pressure is unstable by adding the fuel gas compressor start required time bias value calculated using the function of FIG. 6 from the fuel gas supply pressure signal g measured by Moreover, the standby operation time of the fuel gas compressor can be eliminated.

[0012]

As described above, according to the present invention, since the boosting by the fuel gas compressor is completed at the time of ignition of the gas turbine, it is possible to eliminate the wasteful standby operation of the fuel gas compressor, and to improve the auxiliary machine operation. We can provide economical plant with less power.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a characteristic diagram of the volume chamber pressure and the pressure rising time according to the present invention.

FIG. 3 is a characteristic diagram of fuel gas pressurization according to an embodiment of the present invention.

FIG. 4 is a block configuration diagram of another embodiment.

FIG. 5 is a control block diagram of another embodiment.

FIG. 6 is a characteristic diagram of the fuel gas supply pressure and the boost required time bias value according to the present invention.

FIG. 7 is a block diagram of a conventional example

FIG. 8 is a characteristic diagram of a conventional fuel gas.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Gas turbine equipment 2 ... Compressor 3 ... Gas turbine 4 ... Combustor 5 ... Generator 6 ... Fuel gas compressor equipment 7 ... Fuel gas compressor 8 ... Volume chamber 9 ... Fuel gas compressor controller 10 ... Gas turbine Controller 11… Automatic start controller 30… Volume chamber pressure gauge

Claims (3)

[Claims] 1. In a gas turbine power plant equipped with a fuel gas compressor for boosting the pressure of fuel supplied to a gas turbine, the volume chamber pressure of the fuel gas compressor is detected to calculate the boosting time required for the fuel gas compressor. From this and the time required from the start of starting the gas turbine to the ignition,
An operation control device for a fuel gas compressor, which calculates optimum start timings of the gas turbine and the fuel gas compressor and gives a start command to the fuel gas compressor and the gas turbine based on the calculated start timing. 2. The fuel gas supply pressure is detected, and a boost value required for boosting the fuel gas compressor is added to the boost time required to accurately measure the fuel gas even when the fuel gas supply pressure is unstable. The operation control device for a fuel gas compressor according to claim 1, wherein the compressor pressure rising time is calculated. 3. A pressure gauge for measuring a volume chamber pressure, a pressure gauge for measuring a fuel gas supply pressure, and a volume chamber pressure and a fuel gas supply pressure for outputting a fuel gas compressor and a gas turbine start command. Comparing the fuel gas compressor start-up required time with the computing unit, the fuel gas compressor boosting required time and the gas turbine start-up required time,
The start command is output to the one with the longer time, and after that,
The operation control device for a fuel gas compressor according to claim 1 or 2, further comprising a circuit that outputs a start command to the remaining one after a lapse of a difference in required time.