JP2008140108A - Fire-alarm system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a highly reliable fire-alarm system which can perform emergency-stop even a gas turbine for burning either oil fuel or gas fuel. <P>SOLUTION: The fire-alarm system 2 is provided with a gas leak detection part 3 which operates when gas as the object of detection has set concentration or more; two temperature abnormality detection parts 4 and 5 which operate when the gas as the object of detection has set temperature or more; and a decision part 6 for deciding the state of a gas turbine based on the operations of those detection parts 3 to 5, and for outputting a signal. This decision part 6 outputs a signal for making the gas turbine make an emergency stop when two or more of the detection parts 3 to 5 operate. Thus, even in burning oil fuel from which gas leak is not generated, both the temperat-stop the gas turbine. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fire alarm device for monitoring the state of a gas turbine in order to prevent a gas turbine fire.

  As shown in the schematic diagram of the gas turbine and enclosure in FIG. 6, a plant using a gas turbine GT represented by a thermal power generation plant shields the gas turbine GT and the gas turbine GT and the external environment provided around the gas turbine GT. And a partition wall called an enclosure En. The purpose of this enclosure En is to prevent noise and vibration during the operation of the gas turbine GT from leaking to the outside, and to prevent damage from spreading when a malfunction occurs in the gas turbine GT and a fire or the like occurs. Is provided.

  In addition, in order to monitor the abnormality of the gas turbine GT, a device for monitoring the gas turbine GT may be provided in the internal space shielded by the enclosure En. As an example of the abnormality monitoring device, gas using infrared rays is provided. There is an apparatus for measuring the surface temperature of the rotating shaft of the turbine GT to detect damage to the rotating shaft at an early stage (see Patent Document 1).

  The gas turbine GT rotates the turbine with combustion gas generated by burning fuel, and gas fuel such as natural gas or oil fuel such as heavy oil is used as the fuel. For this reason, a fire alarm device may be provided as an abnormality monitoring device in order to prevent fire due to leakage of gas fuel or abnormal combustion.

  FIG. 7 shows a block diagram of an emergency stop device using a conventional fire alarm device. As shown in FIG. 7, the conventional emergency stop device 100 includes a gas leak detection unit 102 that operates when the detection target gas has a concentration higher than a setting, and a temperature that operates when the temperature exceeds a setting. A fire alarm device 101 including an abnormality detection unit 103, a determination unit 104 that determines a state of the gas turbine based on the operation of the detection units 102 and 103 and emits a signal, and a signal generated by the determination unit 104 An alarm issuing unit 105 for issuing an alarm based on the signal, a carbon dioxide gas injection unit 106 for injecting carbon dioxide gas into the enclosure based on a signal issued by the determination unit 104, and a gas turbine based on a signal issued by the determination unit 104 A gas turbine stopping unit 107 for stopping.

The determination unit 104 in the conventional fire alarm device 101 generates a signal for issuing an alarm when only the gas leak detection unit 102 is operated, or when only the temperature abnormality detection unit 103 is operated. Was supposed to work. Further, when both of these detection units 102 and 103 are operated, it is determined that it is an emergency, and a signal for stopping the gas turbine and a signal for injecting carbon dioxide gas into the enclosure are generated. The gas injection unit 106 and the gas turbine stop unit 107 are operated to prevent a gas turbine fire.
Japanese Patent Laid-Open No. 61-140849

  However, in the conventional fire alarm device 101 shown in FIG. 7, when the gas turbine is operated by burning the oil fuel, no gas leak occurs because the gas fuel is not used, and the gas leak detection unit 102 and the temperature abnormality detection unit 103 did not operate simultaneously. For this reason, when combustion is performed with oil fuel, even if a fire has occurred, a signal for stopping the gas turbine and injecting carbon dioxide gas cannot be generated from the determination unit 104.

  On the other hand, when the temperature abnormality detection unit 103 reacts to deal with this, the determination unit 104 determines that an emergency has occurred and issues a signal for stopping the gas turbine and injecting carbon dioxide gas. Even when the abnormality detection unit 103 malfunctions, it is determined to be an emergency, which reduces the reliability of the fire alarm device 101 and hinders operations such as a plant equipped with a gas turbine.

  Therefore, the present invention solves these problems, and provides a highly reliable fire alarm device that can generate an emergency stop and a signal for injecting carbon dioxide gas even in a gas turbine that burns oil fuel. For the purpose.

  In order to achieve the above object, the present invention includes a detection unit that operates by detecting an abnormality around the gas turbine, determines the state of the gas turbine by confirming the operation of the detection unit, and the determination result. In the fire alarm device that emits a signal for emergency stop of the gas turbine based on the gas leak detection unit that operates when the gas to be detected around the gas turbine has a predetermined concentration or more as the detection unit, and the gas A first temperature abnormality detection unit and a second temperature abnormality detection unit that operate when the ambient temperature of the turbine is equal to or higher than a predetermined temperature, a gas leak detection unit, and a first temperature abnormality detection unit And a determination unit that determines a state of the gas turbine based on the operation of the second temperature abnormality detection unit and emits a signal based on the determination result. A gas leak detector, characterized in that emit a signal to an emergency stop of the gas turbine when the first temperature abnormality detecting unit and the second temperature abnormality detection section, the two or more of the operation.

  In the fire alarm device configured as described above, the determination unit may issue a signal for causing the gas turbine to inject carbon dioxide gas at the same time as issuing a signal for emergency stop of the gas turbine.

  In the fire alarm device configured as described above, the determination unit issues an alarm when at least one of the gas leak detection unit, the first temperature abnormality detection unit, and the second temperature abnormality detection unit is activated. It is also possible to issue a signal to do this.

  Further, in the fire alarm device configured as described above, the gas leak detection unit includes a plurality of gas leak detection elements whose resistance values change according to the concentration of the gas to be detected, and a lead wire that connects the gas leak detection elements in series. And the determination unit may cause a current to flow through the gas leak detection unit and detect a current value flowing through the gas leak detection unit, and may further include a first temperature abnormality detection unit and a second temperature detection unit. The temperature abnormality detection unit includes a plurality of temperature abnormality detection elements whose resistance values change according to the temperature, and conductive wires that connect the plurality of temperature abnormality detection elements in series, and the determination unit includes the first temperature. It is also possible to pass current through each of the abnormality detection unit and the second temperature abnormality detection unit and detect current values flowing through the first temperature abnormality detection unit and the second temperature abnormality detection unit, respectively. It does not.

  With this configuration, the gas concentration detection unit or the first and second temperature abnormality detection units can be changed only by changing the resistance value of any one of the gas leak detection elements or any one of the temperature abnormality detection elements. Can work. Therefore, there is no need to connect each of the gas leak detection element and the temperature abnormality detection element to the determination unit, and the configuration of the gas concentration detection unit and the first and second temperature abnormality detection units can be simplified.

  In the fire alarm device having the above-described configuration, at least one of the first temperature abnormality detection unit and the second temperature abnormality detection unit measures an optical fiber temperature based on an intensity ratio of scattered light to the optical fiber. It does not matter as a total.

  By configuring in this way, temperature abnormalities can be detected in all of the portions where the optical fibers are arranged, and thus a wide range of temperature abnormalities can be monitored. Further, since the thickness of the optical fiber is about several millimeters, the first and second temperature abnormality detection units can be downsized.

  In the fire alarm device configured as described above, an enclosure that shields the gas turbine and the outside world is provided, and the gas leak detection unit, the first temperature abnormality detection unit, and the second temperature abnormality detection unit are formed by the enclosure. The gas leakage detection unit operates when the gas to be detected in the enclosure has a predetermined concentration or more, and is operated in the first temperature abnormality detection unit and the second temperature detection unit. The temperature abnormality detection unit may operate when the temperature in the enclosure is equal to or higher than a predetermined temperature.

  According to the configuration of the present invention, it is determined that there is an emergency when two of the three detection units including the two temperature abnormality detection units and the one gas leakage detection unit are operated, and the gas turbine Since the stop and the injection of carbon dioxide gas are performed, the emergency stop and the injection of carbon dioxide gas can be performed even when oil fuel does not leak due to combustion of oil fuel or the like. Further, in this case, if both of the temperature abnormality detection units do not operate, it is not determined as an emergency, so even if one of the temperature abnormality detection units malfunctions, it is not determined as an emergency and the reliability is high.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS.

  The configuration of the fire alarm device according to the embodiment of the present invention will be described with reference to FIG. FIG. 1 is a block diagram showing a configuration of an emergency stop device using a fire alarm device in an embodiment of the present invention, and corresponds to FIG. 7 showing a conventional example.

  As shown in FIG. 1, an emergency stop device 1 using a fire alarm device 2 according to an embodiment of the present invention includes a gas leak detection unit 3 that operates when a gas to be detected has a concentration higher than a setting, and a setting. A fire alarm device 2 comprising two temperature abnormality detection units 4 and 5 that operate when the temperature is equal to or higher, and a determination unit 6 that makes a determination based on the operation of these detection units and emits a signal, An alarm issuing unit 7 that issues an alarm based on a signal emitted from the determination unit 6, a carbon dioxide gas injection unit 8 that injects carbon dioxide gas into the enclosure based on a signal issued from the determination unit 6, and an emission from the determination unit 6. A gas turbine stop unit 9 that stops the gas turbine based on the signal. The enclosure and the gas turbine are the same as those shown in FIG. 6, and the enclosure En is provided around the gas turbine GT so as to shield the gas turbine GT and the outside world.

  Moreover, operation | movement of the determination part of the fire alarm apparatus in embodiment of this invention is demonstrated using FIG.1 and FIG.2. FIG. 2 is a sequence diagram illustrating a determination operation of the determination unit of the fire alarm device according to the embodiment of the present invention.

  As shown in FIG. 2, the determination unit 6 receives a signal indicating whether or not the three detection units 3 to 5 including the gas leak detection unit 3 and the two temperature abnormality detection units 4 and 5 are in operation. When a signal indicating that at least one of the three detection units 3 to 5 has been operated is input, a signal for issuing an alarm is output from the determination unit 6 and an alarm is issued. In addition, the determination unit 6 also monitors the number of operating detection units. When a signal indicating that two or more detection units from the three detection units 3 to 5 are operated is input to the determination unit 6, the determination unit 6 A signal for stopping the gas turbine and a signal for injecting carbon dioxide gas into the gas turbine are output from the unit 6, and the gas turbine is stopped and carbon dioxide gas is injected into the gas turbine.

  By configuring in this way, even when the gas turbine becomes in an emergency state when burning with oil fuel without using gas fuel, the two temperature abnormality detectors 4 and 5 operate to It is possible to determine the situation and perform emergency stop and carbon dioxide gas injection. Further, in this case, if neither of the temperature abnormality detection units 4 and 5 operates, it is not determined that the gas turbine is in an emergency state. Therefore, the reliability of the fire alarm device 2 can be increased.

  Details of the gas leak detection unit and the temperature abnormality detection unit of the fire alarm device will be described with reference to FIG. FIG. 3 is a schematic view showing a fire alarm device in an embodiment of the present invention.

  First, as shown in FIG. 3, the fire alarm device 2 according to the embodiment of the present invention includes one gas leak detection unit 3, two temperature abnormality detection units 4 and 5, and determination that these three detection units are connected. The gas leak detection unit 3 includes a plurality of gas leak detection elements 3a that operate when the concentration of the gas fuel becomes a predetermined value or more. The plurality of gas leak detection elements 3a are connected in series by a conductive wire 3b, and the end portions of the gas leak detection elements 3a at both ends thereof are respectively connected to the determination unit 6 by a conductive wire 3b. That is, the gas leak detection unit 3 is a loop of one series circuit connected to the determination unit 6.

  Similarly, the two temperature abnormality detection units 4 and 5 form two loops connected to the determination unit 6, respectively, and are connected in series by the conductive wires 4b and 5b, respectively, and become a predetermined temperature or higher. Are provided with a plurality of temperature abnormality detecting elements 4a and 5a.

  Currents are respectively supplied from the determination unit 6 to the loops formed by the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5, respectively. The determination unit 6 monitors the current value of each loop, and when there is an abnormality in the current flowing through each loop, the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 are operated. Confirm. Since the detection elements 3a to 5a are respectively connected in series, if any one of the elements operates, an abnormality occurs in the current value flowing through the loop, and the operation of the determination unit 6 is confirmed.

  As a specific example of the gas leak detection element 3a, for example, a semiconductor element using a metal oxide semiconductor such as tin oxide or zinc oxide can be used. The gas leak detection element provided with this semiconductor element is used by keeping the temperature of the semiconductor element between 300 ° C. and 500 ° C., and by holding at this temperature, oxygen is adsorbed on the surface of the semiconductor element. The resistance value is increased. When the gas leaks from the gas turbine, the leaking gas is flammable and therefore easily combined with oxygen, depriving the oxygen adsorbed on the metal oxide and lowering the resistance value of the metal oxide semiconductor. Therefore, the determination unit 6 confirms that the gas leak detection unit 3 has been operated by increasing the current value of the current flowing through the loop of the gas leak detection unit 3 from a predetermined value.

  On the other hand, as specific examples of the temperature abnormality detection elements 4a and 5a, for example, a thermistor whose resistance value changes with temperature, a thermostat using a bimetal, and a thermal fuse that blows at a certain temperature or more can be used. Since the thermostat and the thermal fuse are disconnected at a certain temperature or higher, when these are used, the current does not flow through the loop of the temperature abnormality detection units 4 and 5, so that the temperature abnormality detection units 4 and 5 Confirmed that it worked.

  Some thermistors have a resistance value that rises and falls as the temperature rises. Some thermistors have a resistance value that suddenly drops when the temperature rises above a certain temperature. When the current value of the current flowing through the loop 5 is reduced, it is detected in the determination unit 6 that the temperature abnormality detection units 4 and 5 are operated, and the current value is increased when the resistance value decreases. Thus, it is confirmed in the determination unit 6 that the temperature abnormality detection units 4 and 5 have been operated.

  Next, an example of arrangement of the gas leak detection unit and the temperature abnormality detection unit inside the enclosure will be described with reference to FIG. FIG. 4 is a schematic perspective view and top view when the fire alarm device according to the embodiment of the present invention is arranged inside the enclosure. The enclosure En, the gas turbine GT, and the rotation axis AR of the gas turbine are indicated by broken lines.

  FIG. 4A shows a case where each of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 is arranged in a plane substantially perpendicular to the rotation axis AR of the gas turbine GT. In this arrangement example, the detection elements 3a to 5a of the respective detection units 3 to 5 are arranged in a plane substantially perpendicular to the rotation axis AR and along the side surface and the top surface inside the enclosure En, and the approximate center of the enclosure En. The gas leak detection unit 3 is disposed in the part, and the two temperature abnormality detection units 4 and 5 are disposed on both sides thereof. Conductive wires 3b to 5b connecting the detection elements 3a to 5a of the respective detection units 3 to 5 are arranged on the side surface and the upper surface inside the enclosure En, and are also arranged on the lower surface. The conducting wires 3b to 5b disposed on the lower surface are disposed in a direction substantially parallel to the rotation axis AR of the gas turbine GT, and project outward from one side surface of the enclosure En that is substantially perpendicular to the rotation axis AR of the gas turbine GT. At the same time, it is connected to the determination unit 6 arranged outside the enclosure En.

  By arranging in this way, it becomes possible to arrange the detection elements 3a to 5a around a place where it is particularly desired to detect an abnormality in the gas turbine GT. Therefore, it is possible to focus on particularly dangerous places of the gas turbine GT, and to detect abnormalities at an early stage.

  FIG. 4B shows a case where each of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 is arranged in a plane substantially parallel to the rotation axis AR of the gas turbine GT. In this arrangement example, the detection elements 3a to 5a of the detection units 3 to 5 are arranged in a direction substantially parallel to the rotation axis AR and arranged on the upper surface inside the enclosure En. At this time, the detection elements forming the central row are the gas leak detection elements 3a, and the detection elements forming the rows at both ends thereof are the temperature abnormality detection elements 4a and 5a, respectively. The conducting wires 3b to 5b connecting these detection elements 3a to 5a are arranged on the upper surface inside the enclosure En and on the side surface of the enclosure En that is substantially perpendicular to the rotation axis AR of the gas turbine GT, and on the lower surface, avoid the gas turbine GT. It is collected on one side of the enclosure En that is substantially perpendicular to the rotation axis AR of the gas turbine GT. And it protrudes to the exterior of the enclosure En from the side surface, and connects to the determination part 6 arrange | positioned outside the enclosure En.

  By arranging in this way, it becomes possible to monitor the state of the entire gas turbine GT from the upper surface of the enclosure En. Therefore, it is possible to detect a gas leak and abnormal heat generation from any location of the gas turbine GT.

  4C, similarly to FIG. 4B, the detection elements 3a to 5a of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 are arranged only on the upper surface inside the enclosure En. FIG. 4B shows a case where the arrangement of the temperature abnormality detection elements 4a and 5a is different. Note that this arrangement example uses a top view different from FIGS. 4A and 4B in order to make the drawing easy to understand.

  As shown in FIG. 4C, the gas leak detection unit 3 is the same as that in FIG. 4B, and is arranged at the center of the upper surface inside the enclosure En so as to be parallel to the rotation axis AR of the gas turbine GT. ing. Furthermore, the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 are connected to the determination unit 6 outside the enclosure En, and the wiring method for the conductive wires 3b to 5b is the same. However, unlike FIG. 4B, this example is arranged so that the detection elements 4a and 5a of the temperature abnormality detection units 4 and 5 are adjacent to each other and the detection elements 4a and 5a detect substantially the same place. Has been. Further, the adjacent temperature abnormality detection elements 4 a and 5 a are alternately arranged on one side and the other side of the gas leak detection unit 3 so as to be along the gas leak detection unit 3. Therefore, when each adjacent temperature abnormality detection element 4a, 5a is connected by conducting wire 4b, 5b, it will become a wave form extended in the direction substantially the same as rotation axis AR of gas turbine GT.

  By arranging in this way, two of the temperature abnormality detection elements 4a and 5a are arranged as a set. Therefore, if only one temperature abnormality detection unit operates, it is determined that there is a high possibility of malfunction. Can do. In addition, when both are operated, emergency stop and carbon dioxide gas injection are performed immediately, and it is possible to react sensitively to local temperature abnormalities.

  In addition, about the example shown to Fig.4 (a) and (b), the row | line | column which each detection element 3a-5a of the gas leak detection part 3 and the temperature abnormality detection parts 4 and 5 forms is substantially parallel, and a gas leak detection element The row 3a is arranged so that the row of temperature abnormality detection elements 4a and 5a is sandwiched, but the arrangement method is not limited to this, and the temperature abnormality detection elements 4a and 5a are respectively arranged as shown in FIG. You may make it adjoin. By arranging in this way, even in the case shown in FIGS. 4A and 4B, it reacts sensitively to local temperature abnormalities as in the case shown in FIG. 4C. Can do.

  Moreover, the arrangement method of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 shown in FIGS. 4A to 4C is an example, and the arrangement method is not limited to this, and the above methods may be combined. It does not matter and it does not matter how it is arranged. Further, the number of the detection elements 3a to 5a of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 may be increased or decreased as compared with the case shown in FIGS.

  3 and 4 show the temperature abnormality detection units 4 and 5 in which the temperature abnormality detection elements 4a and 5a are connected in series, but either one or both of the temperature abnormality detection units 4 and 5 are connected. An optical fiber thermometer may be used. An optical fiber thermometer uses Raman scattering caused by vibration of molecules in the optical fiber when light such as laser light is passed through the optical fiber. The intensity ratio of the scattered light is affected by the temperature of the optical fiber. Utilizes the effect received. Specifically, the temperature is measured by the intensity ratio between Stokes scattered light having a lower frequency than incident light and anti-Stokes scattered light having a higher frequency.

  This optical fiber thermometer receives light in pulses from the end of the optical fiber and analyzes the light that is scattered and returned at various points in the optical fiber, so the temperature distribution of the optical fiber can be examined. it can. Therefore, by using this optical fiber thermometer as the temperature abnormality detection unit of the present invention, it is possible to measure temperature abnormality over a wide range without providing a large number of temperature abnormality detection elements. Further, since the thickness of the optical fiber is about several millimeters, the temperature abnormality detecting unit can be downsized.

  Moreover, as a determination method of a determination part, you may carry out as shown in the flowchart which shows an example of the determination method of the determination part of the fire alarm apparatus in embodiment of this invention of FIG. This determination method will be described below with reference to FIGS.

  First, in this example, when the operation of the fire alarm device 2 is started, the determination unit 6 resets the flags related to the detection units 3 to 5. At this time, the flag relating to the gas leakage detection unit 3 is set to G, the flag relating to the temperature abnormality detection unit 4 is set to Ha, and the flag relating to the temperature abnormality detection unit 5 is set to Hb.

  And after resetting a flag by STEP1, the determination part 6 confirms first whether the gas leak detection part 3 is carrying out the operation | movement which detected the gas leak. When the gas leak detector 3 is operating to detect a gas leak (STEP 2, YES), the flag of the gas leak detector 3 is set to G = 1 (STEP 3). When the gas leak detection unit 3 is not operating (STEP2, NO), the process proceeds to the next operation while keeping the flag G at 0, which is the same as the initial state.

  When the confirmation of the operation of the gas leak detection unit 3 in STEPs 2 and 3 is completed, the operation of the temperature abnormality detection unit 4 is next confirmed. Here, if the temperature abnormality detection unit 4 is operating at a predetermined temperature or higher (STEP 4, YES), the 4 flag Ha = 1 of the temperature abnormality detection unit is set (STEP 5). If the temperature abnormality detection unit 4 is not operating above the predetermined temperature (STEP 4, NO), the process proceeds to the next operation while keeping the flag Ha at 0, which is the same as the initial state.

  Similarly, when the confirmation of the operation of the temperature abnormality detection unit 4 in STEPs 4 and 5 is completed, the operation of the temperature abnormality detection unit 5 is confirmed. When the temperature abnormality detection unit 5 is operating at a predetermined temperature or higher (STEP 6, YES), the flag Hb = 1 of the temperature abnormality detection unit 5 is set (STEP 7). If the temperature abnormality detection unit 5 is not operating above the predetermined temperature (STEP 6, NO), the process proceeds to the next operation while keeping the flag Hb at 0, which is the same as the initial state.

  When the confirmation of the operations of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 in STEPs 2 to 7 is completed, the determination unit 6 integrates the respective results and performs the determination. At this time, the flag total F obtained by adding the flags G, Ha, and Hb of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 is calculated (STEP 8), and the determination is made based on the value of the flag total F. Do. When the flag total F ≧ 2 (STEP 9, YES), a signal for issuing an alarm is issued (STEP 10), and a signal for stopping the gas turbine and a signal for injecting carbon dioxide gas are issued (STEP 11). Then, after issuing these signals, the fire alarm device 2 ends its operation.

  On the other hand, when the flag total F ≧ 2 is not satisfied (STEP 9, NO), it is determined whether or not the flag total F = 1. When the flag total F = 1 (STEP 12, YES), a signal for issuing an alarm is issued (STEP 13), and the operator is confirmed whether or not there is an abnormality in the gas turbine. As a result of actual confirmation by the operator, when it is determined that the gas turbine is in an emergency state (STEP 14, YES), a signal for stopping the gas turbine and a signal for injecting carbon dioxide gas are issued (STEP 11), and a fire alarm is issued. The operation of the device 2 is finished.

  On the other hand, as a result of actually confirming the gas turbine in STEP 14, if it is determined by the operator that there is no emergency (STEP 14, NO), the flags of the detection units 3 to 5 immediately after the start are reset (STEP 1). Subsequently, the operations of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 are confirmed (STEP 2 to 7).

  If the flag total F is not 1 in STEP 12 (STEP 12, NO), that is, if the flag total F = 0 and no abnormality of the gas turbine is detected, the process returns to the confirmation of the operation of the gas leak detector 3 (STEP 2). Subsequently, the operations of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 are confirmed (STEPs 2 to 7).

  Even if the determination unit 6 determines as in this example, when two of the gas leak detection unit 3 and the temperature abnormality detection units 4 and 5 operate, the gas turbine is stopped and carbon dioxide gas is injected. Therefore, even when oiling without causing leakage of gas fuel, it is possible to perform an emergency stop and carbon dioxide gas injection by operating both of the temperature abnormality detection units 4 and 5. In addition, when any one of the detection units 3 to 5 is activated and an alarm is issued, the determination operation is repeated even if the worker stops the alarm, so whether the issued alarm is due to a malfunction. You can check whether.

  The present invention can be used in a fire alarm device that monitors the state of a gas turbine and determines whether there is an emergency. In particular, the present invention is preferably used for a gas turbine that performs oil burning or a dual type gas turbine that uses both oil burning and gas burning.

These are block diagrams of an emergency stop device using a fire alarm device in an embodiment of the present invention. These are the sequence diagrams which show the determination operation | movement of the determination part of the fire alarm apparatus in embodiment of this invention. These are the schematic diagrams which showed the fire alarm apparatus in embodiment of this invention. These are the typical perspective view and top view at the time of arranging the fire alarm device in the embodiment of the present invention inside the enclosure. These are the flowcharts which show an example of the determination method of the determination part of the fire alarm apparatus in embodiment of this invention. FIG. 2 is a schematic diagram of a gas turbine and an enclosure. These are block diagrams of an emergency stop device using a conventional fire alarm device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Emergency stop device 2 Fire alarm device 3 Gas leak detection part 3a Gas leak detection element 3b Conductor 4 Temperature abnormality detection part 4a Temperature abnormality detection element 4b Conductor 5 Temperature abnormality detection part 5a Temperature abnormality detection element 5b Conductor 6 Judgment part 7 Alarm issuing Section 8 Carbon dioxide gas injection section 9 Gas turbine stop section

Claims (6)

A detection unit that operates by detecting an abnormality around the gas turbine is provided, and the state of the gas turbine is determined by checking the operation of the detection unit, and the gas turbine is brought to an emergency stop based on the determination result. In a fire alarm device that emits a signal for
The detection unit operates as a gas leak detection unit that operates when the gas to be detected around the gas turbine has a predetermined concentration or higher, and operates when the temperature around the gas turbine is higher than a predetermined temperature. A first temperature abnormality detection unit and a second temperature abnormality detection unit,
The state of the gas turbine is determined based on the operations of the gas leak detection unit, the first temperature abnormality detection unit, and the second temperature abnormality detection unit, and a signal based on the determination result is generated. A determination unit that emits,
The determination unit causes the gas turbine to stop emergency when two or more of the gas leak detection unit, the first temperature abnormality detection unit, and the second temperature abnormality detection unit are operated. A fire alarm device characterized by emitting a signal.   The fire alarm device according to claim 1, wherein the determination unit issues a signal for causing the gas turbine to inject carbon dioxide gas at the same time as issuing a signal for causing the gas turbine to perform an emergency stop.   The determination unit emits a signal for issuing an alarm when at least one of the gas leak detection unit, the first temperature abnormality detection unit, and the second temperature abnormality detection unit operates. The fire alarm device according to claim 1 or 2, characterized in that.   The gas leak detection unit includes a plurality of gas leak detection elements whose resistance values change according to the concentration of the gas to be detected, and a lead wire that connects the gas leak detection elements in series, and the determination unit The fire alarm device according to any one of claims 1 to 3, wherein a current value flowing through the gas leak detection unit and a current value flowing through the gas leak detection unit are detected.   The first temperature abnormality detection unit and the second temperature abnormality detection unit include a plurality of temperature abnormality detection elements whose resistance values change according to temperature, and a lead wire that connects the plurality of temperature abnormality detection elements in series. And each of the first temperature abnormality detection unit and the second temperature abnormality detection unit causes the current to flow through each of the first temperature abnormality detection unit and the second temperature abnormality detection unit. The fire alarm device according to any one of claims 1 to 4, wherein a current value flowing through the unit is detected.   At least one of the first temperature abnormality detection unit and the second temperature abnormality detection unit is an optical fiber thermometer that measures a temperature based on an intensity ratio of scattered light passing through an optical fiber. The fire alarm device according to any one of claims 1 to 4.

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