JPH066208Y2 - Control device for catalytic combustion type gas turbine - Google Patents

Description

[Detailed Description of the Invention] [Industrial field of application] This invention is applied to an industrial gas turbine such as a gas turbine for power generation, for example, in order to comply with exhaust gas regulations which are becoming stricter year by year. The present invention relates to a control device for a catalytic combustion type gas turbine in which a catalyst that burns fuel at a low temperature to suppress the generation of NO _X is incorporated into the interior of the reactor.

[Prior Art] This type of catalytic combustion type gas turbine suppresses the generation of NO _X by low temperature combustion with a catalyst as described above. Similar to the gas turbine of (1), in addition to the control of the rotation speed by operating the fuel supply flow rate, control for keeping the temperature of the catalyst constant for stable combustion of the catalyst is required.

In executing the two controls, in the past, the fourth
As shown in the figure, the deviation between the actual rotation speed and the rotation speed setting value is obtained, and the rotation speed control loop that controls the fuel control valve by calculating the control amount from the deviation, the actual catalyst temperature and the catalyst temperature setting value The control method that combines two independent control loops such as a catalyst temperature control loop that controls the air control valve that operates the air supply flow rate to the catalyst by calculating the deviation of It had been.

[Problems to be Solved by the Invention] In the case of the conventional catalytic combustion type gas turbine control device as described above, compared with a normal gas turbine which does not have a catalyst, Since the heat capacity is considerably large, the responsiveness of the rotational speed to the change in the fuel supply flow rate due to the operation of the fuel control valve is poor, and the rotational speed control performance suitable for a gas turbine for power generation etc. that requires high-speed response is to be exhibited. However, there was room for improvement in terms of reliability in control performance.

The present invention has been made in view of the above circumstances, and a catalytic combustion type gas turbine capable of exhibiting excellent responsiveness in rotation speed control performance while maintaining the NO _X reduction effect under appropriate parameters. The purpose is to provide a control device.

[Means for Solving the Problems] In order to achieve the above object, a control device for a catalytic combustion type gas turbine according to the present invention comprises a combustor, a catalyst incorporated in the combustor, and A gas turbine that is rotated by combustion gas, a fuel control valve that adjusts the fuel supply flow rate into the combustor so as to control the number of revolutions of the gas turbine, and a fuel control valve that controls the outlet temperature of the catalyst. In a control device for a catalytic combustion type gas turbine having a bypass valve for adjusting and operating an air supply flow rate to a combustor, the operation of the bypass valve can be used together with the control of the rotational speed of the gas turbine. is there.

[Operation] According to the present invention, the low-temperature air can be directly sent to the gas turbine without passing through the catalyst by operating the bypass valve in parallel with the control of the rotational speed of the gas turbine by operating the fuel control valve. Therefore, the predetermined rotation speed control can be performed with extremely high responsiveness without causing a delay due to the influence of the heat capacity of the catalyst.

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an overall schematic configuration diagram of a catalytic combustion type gas turbine according to the present invention. In FIG. 1, 1 is a combustor,
The catalyst 2 is incorporated inside. Reference numeral 3 is a fuel supply pipe for supplying the fuel F into the combustor 1, and a fuel control valve 4 for adjusting the fuel supply flow rate is inserted therein.

A gas turbine 5 is rotated by a combustion gas G generated by burning the fuel at a low temperature by the catalyst 2, and a load 7 such as a generator is connected to an output shaft 6 of the gas turbine and compression is performed. The machine 8 is coaxially integrated. The number of revolutions of the gas turbine 5 is controlled by adjusting the fuel supply flow rate by the fuel control valve 4.

Reference numeral 9 is a supply passage for the combustion air A1 into the combustor 1.
The nozzle 9a is provided at the end thereof. Reference numeral 10 denotes a bypass valve, which is inserted in a bypass passage 11 formed between the combustion air supply passage 9 and the inlet portion 5a of the gas turbine 5. The catalyst 2 and its outlet temperature are controlled by adjusting the supply flow rate of the combustion air A1, and the rotation speed of the gas turbine 5 is adjusted by adjusting the supply amount of the bypass air A2 to the inlet portion 5a of the gas turbine 5. Is controllable.

Next, the operation of the above configuration will be described with reference to FIGS. 2 and 3.

FIG. 2 is a block diagram of a control system in the control device for the catalytic combustion type gas turbine of the present invention.
The deviation between the set speed and the actual speed is the integral compensation factor (K _NI
/ S). This is the coefficient K _{NP for the} actual speed.
Is added to the calculation result obtained by multiplying the differential of the actual rotation speed by K _ND, and by that result, the fuel control valve 4 is adjusted based on the parameter schedule, and the rotation speed of the gas turbine 5 is changed. Controlled.

On the other hand, the deviation between the temperature set value of the catalyst 2 and the actual catalyst temperature is integrated by the integration element. This is a factor (K
_TI / S), K _TP multiplied by the calculation result and the actual catalyst temperature derivative multiplied by K _TD , and this result is added to the actual rotation speed multiplied by the coefficient K. The result is that the bypass valve 10 is adjusted and operated according to the parameter schedule based on the parameter schedule.
The temperature and the rotation speed of the gas turbine 5 are controlled.

That is, since the low-temperature air immediately after leaving the compressor 8 is sent to the inlet portion 5a of the gas turbine 5 by adjusting the opening degree of the bypass valve 10, the inlet temperature of the gas turbine 5 changes abruptly. By utilizing the property that the rotation speed of the gas turbine 5 changes quickly, it is possible to perform predetermined rotation speed control with extremely high responsiveness.

FIG. 3 shows the result of the response test of the rotation speed and the catalyst temperature by the step change of the fuel control valve 4 and the bypass valve 10. As is clear from the figure, the bypass valve 1
Immediately after 0 is opened, the rotation speed sharply decreases, and thereafter, the rotation speed increases with the passage of time, which is a response characteristic.

[Advantages of the Invention] As described above, according to the present invention, the bypass valve for controlling the rotational speed of the gas turbine, adjusting the fuel supply flow rate, and adjusting the air supply flow rate to the combustor incorporating the catalyst. By using this operation together, it is possible to perform predetermined rotational speed control with extremely high responsiveness without being affected by the control delay due to passage of a catalyst with a large heat capacity. It is possible to exhibit a control performance that can be sufficiently applied to a gas turbine that requires.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of the entire catalytic combustion type gas turbine according to the present invention, FIG. 2 is a block diagram of its control system, and FIG. 3 is a result of a step change test of a fuel control valve and a bypass valve. FIG. 4 and FIG. 4 are explanatory views of a conventional control method. 1 ... Combustor, 2 ... Catalyst, 4 ... Fuel control valve, 5 ... Gas turbine, 10 ... Bypass valve.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yasuhiro Ogawa 1-1 Kawasaki-cho, Akashi-shi, Hyogo Kawasaki Heavy Industries Ltd. Akashi factory (56) References 63-49551 (JP, Y2)

Claims (1)

[Scope of utility model registration request] 1. A combustor, a catalyst incorporated in the combustor, a gas turbine rotated by combustion gas in the catalyst, and a combustor for controlling the rotational speed of the gas turbine. In a catalytic combustion type gas turbine control device including a fuel control valve for adjusting and operating the fuel supply flow rate of A control device for a catalytic combustion type gas turbine, wherein the operation of the bypass valve can be used together with the control of the rotational speed of the gas turbine.