A gas turbine dangerous gas monitoring system and method

Abstract

The present invention belongs to the technical field of hazardous gas monitoring, and particularly relates to a hazardous gas monitoring system and method for a gas turbine. It includes a gas sampling module; the inlet of the gas sampling module is arranged at the sampling point; the outlet of the gas sampling module is connected to the inlet of the gas analysis module; the outlet of the calibration gas storage module is connected to the inlet of the gas analysis module; the system controller includes a calibration function module and an operation function module; the operation function module is used to keep the passage between the gas sampling module and the gas analysis module open and disconnect the gas path between the calibration gas storage module and the gas analysis module during non-calibration; the calibration function module is used to stop the gas sampling module during calibration, open the gas path between the calibration gas storage module and the gas analysis module, and send a locking signal to lock the protection logic related to gas calibration in the gas turbine control system. It ensures that the safe and stable operation of the unit is not affected during calibration, realizes calibration without shutting down the machine, and reduces the losses caused by shutdown calibration.

Description

Technical Field

[0001] The present invention belongs to the technical field of hazardous gas monitoring, and particularly relates to a hazardous gas monitoring system and method for a gas turbine. Background Art

[0002] Hazardous gases in gas turbines mainly include methane, hydrogen (for gas turbines with hydrogen-cooled generators), etc. Once leakage occurs, it will become a major safety hazard. If not properly handled, safety accidents and equipment damage may occur, resulting in irreparable losses. In addition, the concentration of hazardous gases is also an important parameter for the ventilation control of gas turbines, which involves the operation control of multiple important equipment. Therefore, the safety, reliability, stability, and accuracy of the hazardous gas monitoring system for gas turbines are of great significance for the safe and stable operation of power plants.

[0003] The existing hazardous gas monitoring systems have the following problems:

[0004] Difficult to calibrate regularly: According to national inspection regulations, hazardous gas detectors need to be calibrated regularly. However, during actual production and operation, power plants need to complete specified start-stop and long-term operation tasks, so they need to calibrate during the calibration period (during shutdown).

[0005] Inconvenient for daily maintenance: Hazardous gas detectors are usually installed at positions such as the top air outlet of the turbine room, the top air outlet of the valve group room, the neutral point of the generator, and the upper part of the outgoing line. Most of them are located at high places, requiring climbing and it is difficult to stand normally, making the maintenance difficult.

[0006] Prone to data drift: Generally, hazardous gas detectors are installed inside the turbine room and the valve group room. Running in a high-temperature environment for a long time is likely to cause the measured data of the sensor to drift. Summary of the Invention

[0007] The purpose of the present invention is to provide a hazardous gas monitoring system and method for a gas turbine to solve the technical problems of cumbersome calibration, difficult maintenance, and unstable detection data in the existing hazardous gas monitoring systems.

[0008] To achieve the above purpose, the present invention adopts the following technical solutions:

[0009] In a first aspect, a hazardous gas monitoring system for a gas turbine includes a gas sampling module, a gas analysis module, a system controller, and a calibration gas storage module;

[0010] The gas inlet of the gas sampling module is set at the sampling point;

[0011] The gas outlet of the gas sampling module is connected to the gas inlet of the gas analysis module;

[0012] The gas outlet of the standard gas storage module is connected to the gas inlet of the gas analysis module;

[0013] The system controller is used to control the on-off of the gas path between the gas sampling module and the gas analysis module; control the on-off of the gas path between the gas outlet of the standard gas storage module and the gas analysis module; and send a switch signal to the gas turbine control system before the calibration starts, so that the gas turbine control system locks the protection logic related to the calibration of dangerous gases.

[0014] A further improvement of the present invention is that: the sampling point is arranged at the air outlet between the valve groups.

[0015] A further improvement of the present invention is that: the gas analysis module includes a second filter and a gas sensor. The gas inlet of the gas sensor is connected to the gas outlet of the second filter. The gas inlet of the second filter is connected to the gas outlet of the gas sampling module, and the gas inlet of the second filter is also connected to the gas outlet of the standard gas storage module.

[0016] A further improvement of the present invention is that: the gas sampling module includes a sampling pipeline, a first filter and an air extraction pump;

[0017] One end of the sampling pipeline is arranged at the sampling point, and the other end is connected to the first filter through a first stop valve. The first filter is connected to the air extraction pump through a pressure reducing valve. The gas outlet of the air extraction pump is connected to the gas inlet of the second filter.

[0018] A further improvement of the present invention is that: the standard gas storage module includes a standard gas cylinder and a second gas solenoid valve. The gas outlet of the standard gas cylinder is connected to the gas inlet of the second filter through the second gas solenoid valve.

[0019] A further improvement of the present invention is that: the system controller further includes an alarm function module. The alarm function module is used to compare the gas analysis result of the gas analysis module with the safety threshold. If it is greater than the safety threshold, an alarm is issued, and the gas alarm data is stored.

[0020] A further improvement of the present invention is that: the alarm function module further includes equipment failure alarm and calibration warning. The equipment failure alarm is used to alarm when a hardware failure occurs and store the equipment alarm data;

[0021] The calibration warning is used to issue a warning according to a preset calibration period.

[0022] A further improvement of the present invention is that: the query function module is used to query the gas real-time monitoring data stored by the operation function module, the calibration result data stored by the calibration function module and the alarm data of the alarm function module.

[0023] A further improvement of the present invention lies in that: the gas sampling module, the gas analysis module and the system controller are all installed inside the control cabinet, the standard gas storage module is arranged outside the control cabinet, an operation display panel is provided on the control cabinet door, and the operation display panel is connected to the system controller.

[0024] Second aspect, a method for monitoring dangerous gases of a gas turbine, comprising the following steps:

[0025] During non-calibration time, the system controller controls to keep the passage between the gas sampling module and the gas analysis module, disconnect the gas path between the standard gas storage module and the gas analysis module, the gas sampling module acquires the sampled gas, preprocesses the sampled gas, and feeds the preprocessed sampled gas into the gas analysis module, the gas analysis module analyzes the sampled gas to generate an analysis result and sends it to the system controller, the system controller stores the real-time gas monitoring data and transmits the data to the gas turbine control system;

[0026] Before the start of the calibration process, the system controller issues a switch signal to lock the protection logic related to the dangerous gas calibration in the gas turbine control system;

[0027] When calibrating, the system controller controls the gas sampling module to stop sampling, opens the gas path between the standard gas storage module and the gas analysis module, the standard gas in the standard gas storage module is fed into the gas analysis module, the gas analysis module generates a standard gas analysis result and sends it to the system controller, and the system controller generates calibration result data according to the standard gas analysis result and stores it.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] 1. Before the start of the calibration process, the system controller of the present invention issues a switch signal to lock the protection logic related to the dangerous gas calibration in the gas turbine control system and cut off the gas path between the gas sampling module and the gas analysis module, ensuring that the safe and stable operation of the unit is not affected during calibration, realizing calibration without shutting down the machine, effectively improving work efficiency and reducing the losses caused by shutdown calibration;

[0030] 2. The present invention centrally installs the gas sampling module, the gas analysis module and the system controller, etc. in the local control cabinet, which is convenient for maintenance personnel to check, replace and calibrate, greatly ensuring personnel safety and saving labor input;

[0031] 3. By installing the gas sampling module, the gas analysis module and the system controller outside, the present invention avoids the influence of the harsh operating environment of high temperature on the equipment, reduces equipment loss, reduces interference and improves the reliability of measurement data. Description of the Drawings

[0032] The attached drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0033] Figure 1 is a system block diagram of a gas turbine hazardous gas monitoring system of the present invention;

[0034] Figure 2 is a schematic structural diagram of a gas turbine hazardous gas monitoring system of the present invention.

[0035] In the figure: 1. Valve group room; 2. Sampling pipeline; 3. Control cabinet; 4. System controller; 5. Operation display panel; 6. Gas sensor; 7. First gas solenoid valve; 8. First filter; 9. Pressure reducing valve; 10. Air extraction pump; 11. Standard gas cylinder; 12. Outlet of valve group room; 13. Sampling point; 14. Second filter; 15. Second gas solenoid valve. Detailed implementation manners

[0036] The present invention will be described in detail below with reference to the attached drawings and in combination with embodiments. It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other.

[0037] The following detailed descriptions are all exemplary descriptions, aiming to provide a further detailed description of the present invention. Unless otherwise specified, all technical terms adopted in the present invention have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present invention belongs. The terms used in the present invention are only for the purpose of describing specific implementation manners and are not intended to limit the exemplary implementation manners according to the present invention.

[0038] Embodiment 1

[0039] Such as Figure 1 , a gas turbine hazardous gas monitoring system includes a gas sampling module, a gas analysis module, a system controller, a standard gas storage module, and a signal transmission module;

[0040] The gas inlet of the gas sampling module is arranged at the sampling point 13;

[0041] The gas outlet of the gas sampling module is connected to the gas inlet of the gas analysis module;

[0042] The gas outlet of the standard gas storage module is connected to the gas inlet of the gas analysis module;

[0043] The standard gas storage module is used to store standard gas and supply gas to the gas analysis module during calibration;

[0044] The gas sampling module is used to extract the gas at the sampling point 13, preprocess the gas, and then introduce it into the gas analysis module;

[0045] The gas analysis module includes a gas sensor 6. The pre-treated gas is analyzed for its components by the gas sensor 6, and the analysis results are sent to the system controller 5 through the signal transmission module;

[0046] The analysis results include the gas components and the concentrations of each component.

[0047] The system controller 5 includes an alarm function module, a query function module, a calibration function module, and an operation function module;

[0048] As Figure 2 shown, the signal output terminals of the system controller 5 are respectively connected to the signal input terminals of the alarm, the memory, the first gas solenoid valve 7, and the second gas solenoid valve 15;

[0049] During non-standard timing, the system controller 5 controls the first gas solenoid valve 7 to open and the second gas solenoid valve 15 to close, opens the gas passage between the gas sampling module and the gas sensor group, and disconnects the gas path between the calibration gas storage module and the gas sensor group;

[0050] Before the start of calibration, the system controller 5 controls the second gas solenoid valve 15 to open and the first gas solenoid valve 7 to close, opens the gas passage between the calibration gas storage module and the gas sensor group, and disconnects the gas path between the gas sampling module and the gas sensor group; and sends a switch signal to the gas turbine control system to lock the protection logic related to the calibration of dangerous gases.

[0051] It ensures that the safe and stable operation of the unit is not affected during calibration, and calibration can be carried out without shutting down the machine.

[0052] The alarm function module includes functions such as gas monitoring alarm, equipment failure alarm, and calibration warning.

[0053] The gas monitoring alarm is an alarm for excessive gas concentration. It compares the gas analysis results of the gas analysis module with the safety threshold. If it is greater than the safety threshold, an alarm is issued, and the gas alarm data is stored;

[0054] The equipment failure alarm includes hardware failure alarms such as sensor zero drift, sensor failure, controller failure, and 24V power supply failure, and stores the equipment alarm data;

[0055] The calibration warning issues a warning before approaching the next calibration time node according to the calibration period set by the operation and maintenance personnel, notifying the operation and maintenance personnel that calibration is required;

[0056] The alarm function module is an alarm, and the alarm is connected to the signal terminal of the system controller 5.

[0057] The signal terminal of the system controller 5 is also connected to a memory, which is used to store real-time gas monitoring data, calibration result data measured by the gas sensor group during calibration, and various alarm data.

[0058] The memory is a readable memory.

[0059] The query function module is used to query real-time gas monitoring data, calibration result data, and alarm data of the alarm function module.

[0060] The gas analysis module includes a second filter 14 and a gas sensor 6. The gas inlet of the gas sensor 6 is connected to the gas outlet of the second filter 14. The gas inlet of the second filter 14 is connected to the gas outlet of the gas sampling module and also to the gas outlet of the standard gas storage module.

[0061] The gas sampling module includes a sampling pipeline 2, a first filter 8, and an air extraction pump 10;

[0062] One end of the sampling pipeline 2 is arranged at the sampling point 13, and the other end is connected to the first filter 8 through a first gas solenoid valve 7. The first filter 8 is connected to the air extraction pump 10 through a pressure reducing valve 9. The gas outlet of the air extraction pump 10 is connected to the gas inlet of the second filter 14.

[0063] The standard gas storage module includes a standard gas cylinder 11 and a second gas solenoid valve 15. The gas outlet of the standard gas cylinder 11 is connected to the gas inlet of the second filter 14 through the second gas solenoid valve 15.

[0064] In this embodiment, the gas sampling module, the gas analysis module, and the standard gas storage module form a monitoring gas path. Different numbers of monitoring gas paths are required in different use sites, and at least one monitoring gas path is required. Different monitoring gas paths in the same site do not affect each other.

[0065] Calibration includes zero-point calibration and full-scale calibration.

[0066] Embodiment 2

[0067] Such as Figure 2 , it is an embodiment in which a dangerous gas monitoring system in Embodiment 1 is applied to the valve group room;

[0068] The most likely place for dangerous gas to accumulate in the valve group room 1 is the air outlet 12 of the valve group room. At this position, a sampling point 13 with a certain space and appropriate distance is selected, and the air inlet of the sampling pipeline 2 is arranged at the sampling point 13;

[0069] Gas sampling module, first gas solenoid valve 7, first filter 8, pressure reducing valve 9, and air extraction pump 10. During calibration, the first gas solenoid valve 7 is closed to prevent calibration gas from entering the valve group chamber 1; the first filter 8 filters the gas to prevent contamination of the gas sensor 6; the pressure reducing valve 9 can adjust the gas pressure; the air extraction pump 10 extracts the gas.

[0070] Calibration gas cylinder 11 provides calibration gas during calibration.

[0071] The gas sampling module, gas analysis module, and system controller 5 are all installed inside the control cabinet 3, the calibration gas storage module is arranged outside the control cabinet 3, and the control cabinet 3 door is provided with an operation display panel 5 which is connected to the system controller.

[0072] Through the operation display panel 5, the operation and maintenance personnel can perform operations and view, including parameter setting, switching between calibration mode and operation mode, alarm query, data viewing, regular calibration related operations, etc.

[0073] Parameter setting means setting the calibration period according to production needs and relevant system standards, and setting early warning for calibration expiration. It can be set to alarm once a month, half a month, and one week before calibration expiration, and alarm through methods such as text messages and the alarm list of the gas turbine control system to notify the operation personnel and equipment owner.

[0074] Embodiment 3

[0075] A gas turbine dangerous gas monitoring system includes the following steps:

[0076] During non - calibration, the system controller 5 controls the first gas solenoid valve 7 to open and the second gas solenoid valve 15 to close, keeping the path between the gas sampling module and the gas sensor group open and disconnecting the gas path between the calibration gas storage module and the gas sensor group. The gas sampling module acquires the sampled gas, pre - processes the sampled gas, and passes the pre - processed sampled gas into the gas sensor group. The gas sensor group analyzes the sampled gas to generate an analysis result and sends it to the system controller 5, and the system controller 5 stores the gas real - time monitoring data in the memory.

[0077] Before the start of the calibration process, the system controller issues a switch signal to lock the protection logic related to dangerous gas calibration in the gas turbine control system.

[0078] When calibrating, the system controller 5 controls the first gas solenoid valve 7 to close, the second gas solenoid valve 15 to open, controls the gas sampling module to stop sampling, and opens the gas path between the calibration gas storage module and the gas sensor group. The calibration gas in the calibration gas storage module is passed into the gas sensor group, and the gas sensor group generates a calibration gas analysis result and sends it to the system controller. The system controller generates calibration result data and stores it in the memory.

[0079] As is known by common technical knowledge, the present invention can be implemented by other embodiments that do not depart from its spiritual essence or essential features. Therefore, the above-disclosed embodiments are illustrative in all aspects and are not exclusive. All changes within the scope of the present invention or within the scope equivalent to the present invention are encompassed by the present invention.

[0080] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that modifications or equivalent substitutions can still be made to the specific embodiments of the present invention. Any modification or equivalent substitution that does not depart from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A gas turbine dangerous gas monitoring system, characterized in that, It includes a gas sampling module, a gas analysis module, a system controller (4), and a calibration gas storage module; The gas inlet of the gas sampling module is arranged at the sampling point (13); The gas outlet of the gas sampling module is connected to the gas inlet of the gas analysis module; The gas outlet of the calibration gas storage module is connected to the gas inlet of the gas analysis module; The gas analysis module includes a second filter (14) and a gas sensor (6). The gas inlet of the gas sensor (6) is connected to the gas outlet of the second filter (14). The gas inlet of the second filter (14) is connected to the gas outlet of the gas sampling module, and the gas inlet of the second filter (14) is also connected to the gas outlet of the calibration gas storage module; The gas sampling module includes a sampling pipeline (2), a first filter (8), and a suction pump (10); One end of the sampling pipeline (2) is arranged at the sampling point (13), and the other end is connected to the first filter (8) through a first gas solenoid valve (7). The first filter (8) is connected to the suction pump (10) through a pressure reducing valve (9). The gas outlet of the suction pump (10) is connected to the gas inlet of the second filter (14); The calibration gas storage module includes a calibration gas cylinder (11) and a second gas solenoid valve (15). The gas outlet of the calibration gas cylinder (11) is connected to the gas inlet of the second filter (14) through the second gas solenoid valve (15); The system controller (4) is used to control the on-off of the gas path between the gas sampling module and the gas analysis module; control the on-off of the gas path between the gas outlet of the calibration gas storage module and the gas analysis module; and send a switch signal to the gas turbine control system before the calibration starts, so that the gas turbine control system locks the protection logic related to the calibration of dangerous gases.

2. The gas turbine hazardous gas monitoring system according to claim 1, wherein The sampling point (13) is arranged at the air outlet (12) of the valve group room.

3. A gas turbine hazardous gas monitoring system according to claim 1, wherein, The system controller (4) further includes an alarm function module. The alarm function module is used to compare the gas analysis result of the gas analysis module with the safety threshold. If it is greater than the safety threshold, an alarm is issued, and the gas alarm data is stored.

4. The gas turbine hazardous gas monitoring system according to claim 3, characterized in that, The alarm function module further includes equipment failure alarm and calibration warning. The equipment failure alarm is used to alarm when a hardware failure occurs and store the equipment alarm data; The calibration warning is used to issue a warning according to the preset calibration period.

5. A gas turbine hazardous gas monitoring system according to claim 4, wherein, The system controller (4) further includes a query function module. The query function module is used to query the gas real-time monitoring data stored by the operation function module, the calibration result data stored by the calibration function module, and the alarm data of the alarm function module.

6. The gas turbine hazardous gas monitoring system according to claim 1, characterized in that, The gas sampling module, the gas analysis module, and the system controller (4) are all installed inside the control cabinet (3). The calibration gas storage module is arranged outside the control cabinet (3). The control cabinet (3) door is provided with an operation display panel (5), and the operation display panel (5) is connected to the system controller.

7. A method for monitoring dangerous gases in a gas turbine, based on the gas turbine dangerous gas monitoring system according to any one of claims 1-6, characterized in that, It includes the following steps: During non - calibration, the system controller (4) controls to keep the passage between the gas sampling module and the gas analysis module, and disconnects the gas path between the calibration gas storage module and the gas analysis module. The gas sampling module acquires the sampled gas, pre - processes the sampled gas, and feeds the pre - processed sampled gas into the gas analysis module. The gas analysis module analyzes the sampled gas to generate an analysis result and sends it to the system controller (4). The system controller (4) stores the real - time gas monitoring data and transmits the data to the gas turbine control system; Before the calibration process starts, the system controller (4) issues a switch signal to lock the protection logic related to the calibration of dangerous gases in the gas turbine control system; When calibrating, the system controller (4) controls the gas sampling module to stop sampling, opens the gas path between the calibration gas storage module and the gas analysis module, feeds the calibration gas in the calibration gas storage module into the gas analysis module. The gas analysis module generates a calibration gas analysis result and sends it to the system controller (4). The system controller (4) generates calibration result data according to the calibration gas analysis result and stores it.

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