JPS5915639A - Control device of gas turbine engine - Google Patents

Abstract

PURPOSE:To reliably prevent miss ignition and miss fire by providing a timer device allowing an exhaust temperature detection section to detect the exhaust temperature at a relatively short and fixed time after the drive start by a starter, a fuel valve control section stopping the fuel feed when the exhaust temperature lower than a predetermined value is detected, and a starter control section. CONSTITUTION:When the fuel is not burnt normally due to miss fire, under a contact point 4 being kept ON, a contact point 14a is made ON at time t1, at the same time, a relay 25 is energized and a contact point 25a is made OFF, a relay 24 is deenergized, a fuel valve is closed and the fuel feed is stopped. Under such a situation, the engine speed is continuously increased by a starter, and at time t2 when a time limit T1 has elapsed, a timer 11 is operated to make a contact point 11a ON. Thereby, a relay 23 is energized to make a contact point 23a OFF, relays 21, 22 and the timer 11 are deenergized, and a coasting operation is resumed to reduce the engine speed. At the same time, the time limit action of a timer 12 is started, and at time t3 when the time limit T2 has elapsed, a contact point 12a is made OFF, and the relay 23 self-held by a contact point 23c is deenergized.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for a gas turbine engine that exhausts unburned gas in the event of an ignition error during startup.

When starting a gas turbine engine, a starter such as a Masumi motor is connected to the turbine shaft via a clutch.
JL: Fuel is injected into the combustor at the same time as driving starts, or after a slight delay, and the fuel is ignited by a spark plug. Then, the amount of fuel supplied is increased while increasing the rotational speed, and the clutch is disengaged when the rotational speed reaches a speed that allows self-operation, but ignition may fail due to some reason such as a malfunctioning ignition plug or an inappropriate mixture ratio. There is.

If such an ignition error occurs, it goes without saying that it will not be possible to switch to self-operation, but it will also cause unburned gas to fill the combustor, turbine, or exhaust path, creating a dangerous situation. Therefore, we immediately stopped the fuel supply and
The so-called air purge operation for exhausting unburned gas is performed by the starter, and the restart operation is then performed again after the -H turbine is stopped. To avoid this, in conventional gas turbines, ignition errors are detected by installing a flame detector in the combustor and detecting the presence or absence of flame. Note that it has already been proposed to improve safety and reduce the burden on the operator by automatically performing air purge operation (for example, Japanese Patent Application Laid-Open No. 55-51925 and Japanese Patent Application Laid-open No. 55-55-51925). 2907
(See Publication No. 6) By the way, the flame detectors used in these conventional examples include, for example, a phototransistor that detects visible light and infrared rays emitted from flames, which are commercially available under names such as 7 Lame Eye. However, in recent years, as the pressure ratio of gas turbine engines has increased and the turbine inlet temperature has also become higher, the flame detector itself has become
It will be exposed to high temperature and pressure of about 7 kg/ad,
It has become difficult to obtain a flame detector that can withstand such usage conditions, and problems have also arisen in that it lacks reliability.

The present invention V.[, Focusing on these points, there is provided a control device for a gas turbine engine that can reliably detect ignition errors and exhaust unburned gas without using a flame detector as described above. This was made for the purpose of providing an exhaust gas temperature detection section, and a timer device that causes the p1' air lagoon detection section to detect the exhaust temperature after a relatively short fixed period of time from the start of driving by tilting the starter. , a fuel valve control unit that stops fuel supply when an exhaust temperature lower than a set value is detected;
The present invention is characterized by comprising a starter control section that continues driving the starter until the rotational speed reaches a speed sufficient to exhaust unburned gas.

In other words, if there is no ignition error and the ignition is normal, the exhaust temperature will rise immediately, so if the temperature remains low even after a certain period of time has passed from startup, it may be determined that an ignition error has occurred. The fuel supply is stopped and the operation is performed for air purge based on the I'lJ constant, so a flame detector in the combustor is not required.

In addition, the exhaust temperature detection section, timer device, fuel valve control section,
The starter control unit and itself are conventionally equipped with gas turbine engine control devices, and can be controlled as desired by changing these set values and partially changing the combination of control sequences. A control sequence with the following functions can be easily obtained.

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

Figure 1 is a wiring diagram of the control circuit, with contacts (la) (1
1)) is turned on by automatic operation such as at 1:00 during a power outage or by the manual operation button, and automatic operation such as checking engine startup and generating alarms. For example, (2) is the start command switch that is turned off by manual operation, and the rotation speed of the turbine.
t is a speed switch that turns off when it reaches 50% of the reference value, (3) is a stop switch that is turned off by manual operation, (4) is a contact point for an exhaust temperature gauge installed in the exhaust duct, The contact (4) is set to turn off when the temperature is lower, for example, by 50°C than the exhaust gas temperature during idling. (11) is 1 during operation! A timer in which the contact (11a) is turned on at IJ and Tl, (12) is a timer in which the contact (12a) is turned off in operation time T2, 03) is a timer in operation time T3, and 04) is a contact in operation time T4. (
14a) is a timer that turns on. Timer (the contacts not shown in the figure are built into the alarm device not shown.1)
is a starting control relay that operates an ignition device or starter (not shown) through contacts (not shown).
22a) (22b) is a lucky relay that is on, (to) is activated, contact (23a) (23b) is off, contact (2
3c) is a 7-on relay, +24) A fuel valve control relay whose contact (24a) is turned on at the time of Vi production 9, and which operates a fuel t1 valve (not shown) by a contact not shown.
ρω is a relay whose contact (2Sa) is turned off when activated.

FIG. 2 is a diagram showing the relationship between time and rotational speed during a starting operation. With the wiring as shown in FIG. 1, when the start command switch (la) (lb) is turned on at time to,
Relays (21) and t2 (24) are energized to start the engine, the fuel valve is opened, fuel is supplied to the combustion chamber and ignited, and the engine is started. At the same time, contact (22a) (
22b) is turned on, the time-limited operation of timer (11+(141) is started, and after time limit T4, contact (1) is turned on at time t1.
4a) is turned on. The time limit T4 is set to about 4 to 7 seconds, which is relatively short compared to the entire time required for the starting operation.

Here, if the fuel is ignited normally, the contact (14a) turns on and the air temperature rises considerably during running, reaching a temperature that is 50°C lower than the exhaust temperature when idling. , the contact (4) is off and the relay (c) does not operate. When the rotational speed further increases, the speed switch (2) is turned off and self-blade operation is started, and at a speed of 90% of the reference value, the start command is canceled and the switches (la) and (lb) are turned off.
As shown by the chain line, the rotational speed increases to the reference value by 57, and from then on, the relay relay is self-maintained by contact (24a) K and operation continues. The operation when a mistake occurs is as follows.

In other words, when the fuel does not burn properly due to an ignition error, the UL: air temperature does not rise and does not reach a temperature that is 50°C lower than the exhaust temperature at idling, and contact (4) iJ remains on. There is. Therefore, at time t1, the contact point (14
At the same time that a) is turned on, the relay (b) is energized and the contact (25a) is turned off, the relay threshold is de-energized, the fuel valve is closed, and the fuel supply is stopped, but the rotational speed remains unchanged. It continues to rise by the l1IJ machine, and after the time limit T□, at time t2, the timer (1) is activated and the contact (lla) is activated.
turns on. This button energizes the relay (8), turns off the contact (23a), and relays (21) and (5)
Then, the timer (11) becomes de-energized, the motor shifts to coasting operation, and the rotational speed decreases. At the same time, the time limit operation of the timer θ→ is started, and after the time limit T2, the contact (12a) is turned off at time t3, and the relay (b), which was self-held by the contact (23c), is de-energized. Now, each timer relay except timer 0 returns to its initial state, so the above-described starting operation is repeated again. If an ignition error occurs for the second time, the ignition error is detected at time t4 and the fuel valve is closed, and at time t5t, the engine is accelerated and coasting operation begins. After time limit T3, at time t6, the timer The engine is activated, an alarm is issued, and the start command switch (la) (l
b) is turned off, and the series of starting operations ends at time tt.
3 (or br) is the exhaust time, and the total displacement during that time is proportional to the area shown with diagonal lines, so this area is sufficient to fully exhaust the unburned gas. By increasing the size, air purge is performed in case of ignition error. Therefore, in this embodiment, the time period T
1 to a length that allows the required rotational speed to be obtained, and ensure that the area necessary for air purge as described above is secured during the total period of the acceleration period by the starter and the coasting period by time limit T2. . If the time limit Tl is short and the coasting operation is started at time <≦ as shown by the broken line, the required total displacement cannot be obtained without knowing the coasting period.

The time limit Tl and I2 are set in consideration of the capacity of the gas turbine engine, the acceleration performance of the starter, etc., and the time limit T1 is usually selected to be about 37 to 38 seconds. Furthermore, since it is common practice in emergency power generating equipment to try to start it twice, the time limit T3 of the timer (13) is selected to be approximately twice K Tl +T2 as shown in FIG. Further, as in the above embodiment, the rotation speed may be directly detected by a rotation speed detection switch instead of obtaining the rotation speed necessary for transitioning to coasting operation using the operation time limit T1 of the timer. As is clear from the description of the embodiment, the present invention detects an ignition error by detecting the exhaust temperature after a relatively short fixed period of time after the start of driving by the starter, and closes the Km stab valve in the event of an ignition error. and start until it reaches a certain rotation speed! Since the 1iIJ machine continues to be driven, there is no need to install a flame detector in high-temperature, high-pressure environments, improving reliability. Rather than changing set values or combinations, it is easier to achieve the desired purpose, and it can be used as a prime mover for emergency power generation equipment, such as in a pill basement, where damage is likely to be large in the event of an explosion. There is an advantage that a gas turbine engine suitable for installation at a location can be obtained at a low cost.

[Brief explanation of the drawing]

FIG. 1 is a wiring diagram of one embodiment of the present invention, and FIG. 2 is a characteristic diagram showing the relationship between time and rotational speed in the same embodiment. (la) (lb)...Start command switch, (4
)...Exhaust temperature gauge contact, (Ill (12i o3
)CI41-...Timer, (Lla) (12a) (
14a)...Timer contact, (2+1 +22,1(
231e241 N --- Relay, (22a) (23
aX23bX23c) (24a) (25a) - Relay contacts. Patent applicant: Yanmar Diesel Co., Ltd. Representative Patent Attorney: M RoJ Minoru

Claims (1)

[Claims] (+l Exhaust temperature detection section, timer device that causes the exhaust temperature detection section to detect the air temperature after a relatively short fixed period of time from the start of driving by the starter, and a timer device that causes the exhaust temperature detection section to detect the air temperature after a relatively short fixed period of time after the start of driving by the starter, and a fuel PI Control of a gas turbine engine characterized by comprising: a fuel valve control unit that stops the supply of fuel (!-1) and a starter control unit that continues driving by the starter until a rotational speed sufficient to exhaust unburned gas is reached. Device.