A combustible gas leakage monitoring device for a combustion engine

Abstract

The utility model discloses a kind of combustible gas leakage monitoring devices of gas turbine, belong to gas turbine safety technical field, including combustible gas detector in the gas turbine cover shell, DCS cabinet, gas turbine fire control cabinet and TCS cabinet.The utility model cancels the original special alarm controller in fire control cabinet, and the signal of detector is directly sent to DCS system after being switched by terminal row in cabinet;DCS system is responsible for logical operation, and its output signal is fed back to fire cabinet trigger sound-light alarm, and trip signal is output to TCS system in redundant mode, by structure optimization, control core is transferred to DCS with higher reliability, eliminates the single-point failure risk of original centralized controller, simultaneously realizes remote monitoring, significantly improves the security and reliability of system.

Description

Technical Field

[0001] This utility model relates to the field of gas turbine safety protection technology, and more specifically, to a gas turbine combustible gas leakage monitoring device. Background Technology

[0002] Gas turbines, as highly efficient power plants, are widely used in power generation. Their operational safety is paramount, especially preventing fires or explosions caused by flammable gas leaks within the turbine casing. Currently, traditional gas turbine flammable gas leak monitoring generally employs an independent fire protection system. This system typically includes a centralized fire control cabinet containing a dedicated flammable gas alarm controller. Multiple flammable gas detectors installed in the field first send signals to this alarm controller, which processes the signals, performs logical judgments, and then outputs an alarm or trip signal to the gas turbine main control system (TCS).

[0003] This traditional structure has significant safety hazards and functional defects. First, the system redundancy is poor. Multiple detectors (e.g., four) are often connected to the same alarm controller. If the controller itself fails, all its subordinate detectors will be simultaneously flagged as faulty, easily triggering the gas turbine to trip, lacking necessary redundancy backup. Second, power supply reliability is insufficient. Once the main power supply to the fire control cabinet fails, its backup battery has limited endurance. If the main power cannot be restored in time, the system power outage will also cause unplanned shutdowns, posing a significant safety hazard. Finally, monitoring convenience is poor. The real-time concentration values ​​of combustible gas detectors are only displayed on the local fire control cabinet, and operators in the central control room cannot monitor them remotely in real time, hindering early warning and operational management. Therefore, there is an urgent need for a more reliable and conveniently monitored combustible gas leak monitoring device for gas turbines. Utility Model Content

[0004] To address the aforementioned problems in the existing technology, the purpose of this utility model is to provide a gas turbine combustible gas leakage monitoring device, comprising: Multiple combustible gas detectors are fixedly installed inside the gas turbine casing; The distributed control system (DCS) cabinet contains analog input cards and digital output cards. The gas turbine fire control cabinet has a first terminal block inside; The gas turbine control system TCS cabinet has a second terminal block inside. The signal output terminal of the combustible gas detector is connected to the first terminal block inside the gas turbine fire control cabinet via a first signal cable. The first terminal block is connected to the analog input card inside the DCS cabinet via a second signal cable; The digital output card in the DCS cabinet is connected back to the gas turbine fire control cabinet via a third signal cable to drive the audible and visual alarm installed on the gas turbine fire control cabinet. The digital output card in the DCS cabinet is also connected to the second terminal block in the TCS cabinet via a fourth signal cable.

[0005] As a preferred embodiment, the DCS cabinet includes a first cabinet and a second cabinet, with the analog input cards distributed in the first cabinet and the second cabinet, and the digital output cards located in the second cabinet.

[0006] As a preferred embodiment, the digital output card is provided with at least three redundant output channels, which are respectively connected to different access points on the second terminal block inside the TCS cabinet via independent fourth signal cables.

[0007] As a preferred embodiment, the power input terminal of the combustible gas detector is connected to the output terminal of the DC power module installed in the DCS cabinet via a power cable 9.

[0008] As a preferred embodiment, the first signal cable, the second signal cable, the third signal cable, and the fourth signal cable are all shielded twisted-pair cables.

[0009] As a preferred embodiment, the first terminal block is directly used to transfer signals from the combustible gas detector.

[0010] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention eliminates the need for a centralized alarm controller by directly integrating the combustible gas detector signal into the DCS system for logical judgment, fundamentally eliminating the risk of false tripping due to single-point failures and significantly improving the reliability and redundancy of the protection system. Simultaneously, it utilizes the stable and reliable power supply of the DCS system and enables remote real-time monitoring of the leak concentration in the central control room, optimizing operation management and resulting in a safer and more rational overall structure. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the logic framework of this utility model. Detailed Implementation

[0012] The present invention will be further described below with reference to specific embodiments.

[0013] A gas turbine combustible gas leakage monitoring device, comprising: Multiple combustible gas detectors 1 are fixedly installed inside the gas turbine casing; The distributed control system (DCS) cabinet 2 contains analog input cards 21 and digital output cards 22. The gas turbine fire control cabinet 3 has a first terminal block 31 inside; The gas turbine control system TCS cabinet 4 (21CJP41) has a second terminal block 41 inside. The signal output terminal of the combustible gas detector 1 is connected to the first terminal block 31 inside the gas turbine fire control cabinet 3 via the first signal cable 5; The first terminal block 31 is connected to the analog input card 21 in the DCS cabinet 2 via the second signal cable 6; The digital output card 22 inside the DCS cabinet 2 is connected to the gas turbine fire control cabinet 3 via the third signal cable 7, and is used to drive the audible and visual alarm 32 installed on the gas turbine fire control cabinet 3. The digital output card 22 inside the DCS cabinet 2 is also connected to the second terminal block 41 inside the TCS cabinet 4 via the fourth signal cable 8.

[0014] Preferably, the original combustible gas alarm controller inside the gas turbine fire control cabinet is removed, and the first terminal block 31 is directly used to transfer signals from the combustible gas detectors 1. In use, multiple combustible gas detectors 1 first detect the concentration of combustible gas inside the gas turbine casing in real time. When the detected combustible gas concentration exceeds the preset safety threshold, the combustible gas detectors 1 immediately transmit the signal to the first terminal block 31 inside the gas turbine fire control cabinet 3 through the first signal cable 5.

[0015] After receiving the signal, the first terminal block 31 quickly transmits the signal to the analog input card 21 in the DCS cabinet 2 of the distributed control system via the second signal cable 6. The analog input card 21 analyzes and processes the received signal to determine the severity of the combustible gas leak.

[0016] If the judgment result indicates that there is a risk of combustible gas leakage, the digital output card 22 in the DCS cabinet 2 sends a command to the gas turbine fire control cabinet 3 through the third signal cable 7, which drives the audible and visual alarm 32 to emit a strong audible and visual alarm, reminding on-site personnel to take timely countermeasures.

[0017] Meanwhile, the digital output card 22 also transmits signals to the second terminal block 41 in the gas turbine control system TCS cabinet 4 via the fourth signal cable 8. The TCS cabinet 4 adjusts the operating parameters of the gas turbine according to the received signals, such as reducing the gas turbine power and changing the operating mode, in order to reduce the dangers that may be caused by combustible gas leakage and ensure the safe and stable operation of the gas turbine. The high I value and high II value are fed back to the gas turbine fire control system and the TCS control system respectively through the DCS system DO signal transmission method, so as to realize the corresponding audible and visual alarm and combustible gas leakage alarm and protection in the gas turbine fire protection system.

[0018] In a preferred embodiment, the DCS cabinet 2 includes a first cabinet 201 (2DC05) and a second cabinet 202 (2DC06). Analog input cards 21 are distributed in the first cabinet 201 and the second cabinet 202, and digital output cards 22 are located in the second cabinet 202. The first cabinet 201 is mainly responsible for handling relatively conventional analog signal input tasks and performing preliminary analysis and judgment on some common combustible gas leakage-related signals. The second cabinet 202 undertakes a more complex and critical task. It not only contains some analog input cards 21 to handle special or high-precision signals, but its internal digital output cards 22 are also the core of the entire system's command issuance. After receiving the judgment result from the analog input cards 21, it quickly and accurately sends control commands to other devices through the corresponding signal cables, ensuring that the entire gas turbine system can make a timely and effective response when facing the risk of combustible gas leakage.

[0019] In a preferred embodiment, the digital output card 22 is equipped with at least three redundant output channels. These at least three output channels are each connected to different access points on the second terminal block 41 inside the TCS cabinet 4 via independent fourth signal cables 8. This ensures that even if one or two signal cables fail, the digital output card 41 can still send control commands to the TCS cabinet 4 through the remaining normal channels, thereby greatly improving the reliability and stability of the system. Each output channel is equipped with an independent signal processing and transmission module to ensure the accuracy and timeliness of signal transmission. Simultaneously, the second terminal block 41 inside the TCS cabinet 4 also features a corresponding redundancy design, corresponding one-to-one with the output channels of the digital output card to ensure complete signal reception and processing.

[0020] In a preferred embodiment, the power input terminal of the combustible gas detector 1 is connected to the output terminal of the DC power module 23 installed in the DCS cabinet 2 via a power cable 9. The DC power module 23 has overcurrent, overvoltage, and short-circuit protection functions, providing a stable and reliable power supply to the combustible gas detector 1. The power cable 9 employs a shielded design, effectively reducing the impact of external electromagnetic interference on power transmission and ensuring that the combustible gas detector 1 can operate normally in various complex environments. Simultaneously, the DCS cabinet 2 is also equipped with a power monitoring module, which monitors the output voltage and current of the DC power module 23 in real time. If any abnormality is detected, an alarm signal is immediately issued so that timely measures can be taken to ensure the safe operation of the entire system.

[0021] In a preferred embodiment, the first signal cable 5, the second signal cable 6, the third signal cable 7, and the fourth signal cable 8 are all shielded twisted-pair cables. These shielded twisted-pair cables have excellent anti-interference capabilities, effectively resisting interference from external electromagnetic fields and ensuring the stability and accuracy of signals during transmission. Their shielding layer prevents signal leakage and reduces signal attenuation, allowing the signals detected by the combustible gas detector to be transmitted completely and accurately to the TCS cabinet for processing and analysis. Furthermore, the twisted-pair structure further reduces the impact of electromagnetic interference, improves signal transmission quality, and ensures reliable operation of the entire system even in complex environments.

[0022] The contents not described in detail in this specification are existing technologies known to those skilled in the art, and their specifications and models can be selected according to actual conditions.

[0023] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical embodiments described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A gas turbine combustible gas leakage monitoring device, characterized in that, include: Multiple combustible gas detectors (1) are fixedly installed inside the gas turbine casing; The distributed control system (DCS) cabinet (2) is equipped with analog input cards (21) and digital output cards (22). The gas turbine fire control cabinet (3) has a first terminal block (31) inside. The gas turbine control system TCS cabinet (4) has a second terminal block (41) inside. The signal output terminal of the combustible gas detector (1) is connected to the first terminal block (31) inside the gas turbine fire control cabinet (3) via the first signal cable (5). The first terminal block (31) is connected to the analog input card (21) inside the DCS cabinet (2) via the second signal cable (6). The digital output card (22) inside the DCS cabinet (2) is connected back to the gas turbine fire control cabinet (3) via a third signal cable (7) to drive the audible and visual alarm (32) installed on the gas turbine fire control cabinet (3). The digital output card (22) in the DCS cabinet (2) is also connected to the second terminal block (41) in the TCS cabinet (4) via the fourth signal cable (8).

2. The gas turbine combustible gas leakage monitoring device according to claim 1, characterized in that, The DCS cabinet (2) includes a first cabinet (201) and a second cabinet (202). The analog input card (21) is distributed in the first cabinet (201) and the second cabinet (202), and the digital output card (22) is located in the second cabinet (202).

3. The gas turbine combustible gas leakage monitoring device according to claim 1, characterized in that, The digital output card (22) is provided with at least three redundant output channels, which are respectively connected to different access points on the second terminal block (41) inside the TCS cabinet (4) via independent fourth signal cables (8).

4. The gas turbine combustible gas leakage monitoring device according to claim 1, characterized in that, The power input terminal of the combustible gas detector (1) is connected to the output terminal of the DC power module (23) installed in the DCS cabinet (2) via a power cable (9).

5. The gas turbine combustible gas leakage monitoring device according to claim 1, characterized in that, The first signal cable (5), the second signal cable (6), the third signal cable (7) and the fourth signal cable (8) are all shielded twisted pair cables.

6. The gas turbine combustible gas leakage monitoring device according to claim 1, characterized in that, The first terminal block (31) is used directly to transfer signals from the combustible gas detector (1).

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