CN113030387A - Device for measuring content of methane discharged by gas turbine - Google Patents
Device for measuring content of methane discharged by gas turbine Download PDFInfo
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- CN113030387A CN113030387A CN202110264588.1A CN202110264588A CN113030387A CN 113030387 A CN113030387 A CN 113030387A CN 202110264588 A CN202110264588 A CN 202110264588A CN 113030387 A CN113030387 A CN 113030387A
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000005259 measurement Methods 0.000 claims abstract description 70
- 238000001914 filtration Methods 0.000 claims description 20
- 230000001105 regulatory effect Effects 0.000 claims description 20
- TXKMVPPZCYKFAC-UHFFFAOYSA-N disulfur monoxide Inorganic materials O=S=S TXKMVPPZCYKFAC-UHFFFAOYSA-N 0.000 claims description 13
- XTQHKBHJIVJGKJ-UHFFFAOYSA-N sulfur monoxide Chemical compound S=O XTQHKBHJIVJGKJ-UHFFFAOYSA-N 0.000 claims description 13
- 230000001276 controlling effect Effects 0.000 claims description 11
- 230000004888 barrier function Effects 0.000 claims description 10
- 239000013618 particulate matter Substances 0.000 claims description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000013022 venting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 6
- 239000007789 gas Substances 0.000 description 133
- 238000002485 combustion reaction Methods 0.000 description 5
- 238000004880 explosion Methods 0.000 description 5
- 238000010926 purge Methods 0.000 description 3
- 239000012535 impurity Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- 241001584775 Tunga penetrans Species 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000012790 confirmation Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/0004—Gaseous mixtures, e.g. polluted air
- G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
- G01N33/0027—General constructional details of gas analysers, e.g. portable test equipment concerning the detector
- G01N33/0036—General constructional details of gas analysers, e.g. portable test equipment concerning the detector specially adapted to detect a particular component
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- Combustion & Propulsion (AREA)
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- Analytical Chemistry (AREA)
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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Pathology (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a device for measuring the content of methane exhausted by a gas turbine, which comprises a control system, an exhaust measurement passage, an air measurement branch and an online calibration measurement branch, wherein the specific numerical value of the content of the methane exhausted by the gas turbine can be obtained by matching the control system with the exhaust measurement passage, so that whether the gas turbine has an ignition condition or not is judged by utilizing the numerical value, and reliable data support is provided for the safe operation of the gas turbine. The measurement of the device can be calibrated by calibrating the measurement branch on line, and the accuracy of the measurement result is ensured. The air measurement branch can be used for converting exhaust measurement into air measurement after the exhaust measurement is finished, and damage to each part in the device due to frequent starting and stopping is avoided. The method can obtain the specific numerical value of the content of the methane exhausted by the gas turbine, so that whether the gas turbine has the ignition condition or not is judged by utilizing the numerical value, and reliable data support is provided for the safe operation of the gas turbine.
Description
Technical Field
The invention relates to the field of gas turbine gas measuring devices, in particular to a device for measuring the content of methane in exhaust gas of a gas turbine.
Background
The gas turbine is an internal combustion type power machine which takes continuously flowing gas as a working medium to drive an impeller to rotate at a high speed and converts the energy of fuel into useful work, and is a rotary impeller type heat engine. When the gas turbine operates, the air entering the combustion chamber is mixed with natural gas and then combusted, high-temperature and high-pressure gas formed after combustion enters the turbine to expand to do work, and the high-temperature gas after doing work is discharged through the gas turbine exhaust section. However, the exhaust gas components of a gas turbine may have methane that is not sufficiently combusted, and if the methane and oxygen form a mixture in a certain ratio to reach an explosion limit, combustion or explosion may occur at the time of ignition of the combustion engine.
In the prior art, the method of high-speed barring and purging is generally adopted to discharge the tail gas remained at the exhaust section of the gas turbine before the gas turbine is ignited, so that the methane concentration remained at the exhaust section of the gas turbine is prevented from reaching the explosion limit when the gas turbine is ignited, and potential safety hazards are brought to the gas turbine. However, in this way of reducing the methane content in the exhaust section by means of high-speed jigger purging for a certain period of time, since the purging time is determined by the free volume of the gas passage, it is still impossible to confirm the specific methane content value in the exhaust section of the gas turbine, and there is still a certain risk in the ignition of the gas turbine.
Disclosure of Invention
The invention aims to overcome the problems in the prior art and provides a device for measuring the content of methane in the exhaust gas of a gas turbine.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
an apparatus for measuring the methane content of a gas turbine exhaust, comprising: comprises a control system, an exhaust measuring passage, an air measuring branch and an on-line calibration measuring branch, wherein,
the exhaust measurement channel comprises an exhaust section gas inlet, a water removal filter, a gas exhaust explosion-proof flow switch, a filtering assembly, a flow regulating assembly, a vacuum pump, a sensor and a vent outlet which are connected in sequence;
the air measurement branch comprises an air inlet, an air flow explosion-proof switch and a switching electromagnetic valve, wherein one end of the air flow explosion-proof switch is connected with the air inlet, and the other end of the air flow explosion-proof switch is connected between the gas exhaust explosion-proof flow switch and the filtering assembly through the switching electromagnetic valve;
the on-line calibration measurement branch comprises a calibration gas cylinder, a calibration pressure reducing valve and a calibration electromagnetic valve, the calibration gas cylinder is connected between the filtering component and the flow regulating component through the calibration electromagnetic valve, and the calibration pressure reducing valve is arranged between the calibration gas cylinder and the calibration electromagnetic valve;
the control system is respectively connected with the gas exhaust explosion-proof flow switch, the air flow explosion-proof switch, the switching electromagnetic valve, the calibration electromagnetic valve, the vacuum pump and the sensor, and is used for receiving signals of the gas exhaust explosion-proof flow switch, the air flow explosion-proof switch and the sensor and controlling the switching electromagnetic valve, the calibration electromagnetic valve, the vacuum pump and the sensor.
In the device, before the gas turbine is ignited, the control system controls the switching electromagnetic valve and the calibration electromagnetic valve to communicate the exhaust measurement passage, so that the measurement of the content of the exhaust methane of the gas turbine is realized; after the gas turbine is ignited, the control system controls the switching electromagnetic valve and the calibration electromagnetic valve to enable the air inlet to be communicated with the emptying outlet, and measurement of air content is achieved; after the gas turbine is ignited or when the unit is in a stop state, the control system controls the switching electromagnetic valve and the calibration electromagnetic valve to enable the calibration gas cylinder to be communicated with the emptying outlet, and therefore measurement of calibration gas is achieved.
The control system comprises an analog quantity input interface, a digital quantity input interface I, a digital quantity input interface II, a digital quantity input interface III, a digital quantity input interface IV, a digital quantity output interface I, a digital quantity output interface II, a digital quantity output interface III and a digital quantity output interface IV, wherein the analog quantity input interface is used for receiving a methane content signal measured by a sensor, the digital quantity input interface IV is used for receiving an alarm signal sent by the sensor, the digital quantity input interface IV is used for receiving a fault signal sent by the sensor, the digital quantity output interface IV is used for sending a calibration instruction to the sensor, the digital quantity input interface IV is used for receiving a calibration signal sent by the sensor, the digital quantity input interface IV is used for receiving a trigger signal of an air flow explosion-proof switch, and the digital quantity input interface IV is used for receiving a trigger signal of a gas exhaust explosion-proof flow switch, the first digital output interface is used for controlling the action of the switching electromagnetic valve, the second digital output interface is used for controlling the action of the calibration electromagnetic valve, and the third digital output interface is used for controlling the start and stop of the vacuum pump and the sensor.
An analog quantity signal safety barrier is arranged between the analog quantity input interface and the sensor, digital quantity input safety barriers are arranged between the digital quantity input interface I, the digital quantity input interface II, the digital quantity input interface III and the sensor, and a digital quantity output safety barrier is arranged between the digital quantity output interface IV and the sensor.
The filtering component comprises a sulfur oxide filter and a particulate matter filter, and the sulfur oxide filter and the particulate matter filter are sequentially connected between the gas exhaust explosion-proof flow switch and the flow regulating component.
The flow regulating assembly comprises a flow regulating valve and a flow indicator, and the flow regulating valve and the flow indicator are sequentially connected between the filtering assembly and the vacuum pump.
The dewatering filter is externally connected with a drainage port through a pipeline, and a drainage hand valve is arranged on the pipeline.
The device is provided with a cabinet body, and an exhaust measurement passage, an air measurement branch and an online calibration measurement branch are all fixed in the cabinet body.
The cabinet body is internally provided with a heater and a heating switch for controlling the heater.
The invention has the advantages that:
1. the measuring device comprises a control system, an exhaust measuring passage, an air measuring branch and an online calibration measuring branch. The control system is matched with the exhaust measurement channel to obtain a specific numerical value of the content of the methane in the exhaust gas of the gas turbine, so that whether the gas turbine has an ignition condition or not is judged by using the numerical value, and reliable data support is provided for safe operation of the gas turbine. The measurement of the device can be calibrated by calibrating the measurement branch on line, and the accuracy of the measurement result is ensured. The air measurement branch can be used for converting exhaust measurement into air measurement after the exhaust measurement is finished, and damage to each part in the device due to frequent starting and stopping is avoided.
2. The switching electromagnetic valve is configured, and the switching electromagnetic valve is used for realizing the measurement of gas extraction from the gas turbine exhaust through the exhaust measurement passage before ignition and switching to the air measurement branch for air measurement after ignition, thereby being beneficial to prolonging the service life of the sensor.
3 the switching electromagnetic valve and the calibration electromagnetic valve are in a safe design and are in a non-electrified state for a long time, so that the service life of the electromagnetic valve is prolonged.
4. The invention respectively arranges the flow switches in the exhaust measuring passage and the air measuring branch, and after the electromagnetic valve is switched to act, whether the switching is successful can be judged through the flow switches. By this increase confirmation condition, the reliability of the apparatus is improved.
5. According to the invention, the water removal filter, the sulfur oxide filter and the particulate filter are arranged in the exhaust measurement channel, and impurities in the gas can be filtered through the filters, so that the measurement accuracy of the sensor is improved.
6. The switching electromagnetic valve, the online calibration electromagnetic valve, the vacuum pump and the sensor are all controlled by the control system, so that the automation degree of the whole device is higher.
7. According to the invention, the isolation safety barrier is arranged between the signal and the control system, so that the safety coefficient of the device is higher.
8. The invention adds the heater, so that the device can be suitable for cold regions, and the application range of the device is enlarged.
Drawings
FIG. 1 is a schematic diagram of the present invention.
Labeled as: 1. a water removal filter, 2, a gas exhaust explosion-proof flow switch, 3, an air flow explosion-proof switch, 4, a switching electromagnetic valve, 5, a sulfur oxide filter, 6, a particulate filter, 7, a calibration electromagnetic valve, 8, a flow regulating valve, 9, a flow indicator, 10, a vacuum pump, 11, a sensor, 12, an analog quantity signal safety grid, 13, a digital quantity input safety grid, 14, a digital quantity output safety grid, 15, a heater, 16, a heating switch, 17, a calibration pressure reducing valve, 18, a calibration gas cylinder, 19, a gas turbine, 20, an analog quantity input interface, 21, a first digital quantity input interface, 22, a second digital quantity input interface, 23, a third digital quantity input interface, 24, a fourth digital quantity output interface, 25, a fourth digital quantity input interface, 26, a fifth digital quantity input interface, 27, a first digital quantity output interface, 28 and a second digital quantity output interface, 29. a third digital output interface, 30 and a drainage manual valve.
Detailed Description
Example 1
The invention discloses a measuring device for measuring the methane content in the gas at the exhaust section of a gas turbine 19, which specifically comprises a control system, an exhaust measuring passage, an air measuring branch and an online calibration measuring branch. In actual use, the method only needs to measure before the ignition of the gas turbine 19, so that when the gas turbine is ignited, residual methane does not exist in the exhaust section of the gas turbine 19, and the measured value of the methane is an important criterion for judging whether the gas turbine 19 is ignited or not, so that the safe operation of a unit is ensured. Wherein the exhaust gas measurement path is used to measure the exhaust gas prior to ignition of the gas turbine 19. After the gas turbine 19 is ignited, the sensor 11 cannot bear high-temperature gas at the exhaust section of the gas turbine 19, so that the exhaust measurement path needs to be switched to the air measurement branch, and frequent start and stop of the sensor 11 and other components are avoided. After the gas turbine 19 is ignited or when the unit is in a shutdown state, which may cause inaccurate measurement results, the online calibration measurement branch needs to be switched to for recalibration, so as to improve the measurement accuracy. Specifically, the structure, position and connection relationship of each component are as follows:
the exhaust gas measurement access is only communicated before the ignition of the gas turbine 19, and comprises an exhaust section gas inlet, a water removal filter 1, a gas exhaust explosion-proof flow switch 2, a filtering component, a flow regulation component, a vacuum pump 10, a sensor 11 and an emptying outlet, wherein the exhaust section gas inlet, the water removal filter 1, the gas exhaust explosion-proof flow switch 2, the filtering component, the flow regulation component, the vacuum pump 10, the sensor 11 and the emptying outlet are sequentially connected, and the exhaust section gas inlet acquires gas exhausted by the gas turbine 19 through an exhaust sampling interface arranged on the gas turbine 19. Wherein the water removal filter 1 and the filter assembly are used for filtering impurities and moisture in the gas to improve the measurement accuracy of the sensor 11 and to prolong the service life of the sensor 11. The dewatering filter 1 is externally connected with a drainage port through a pipeline, a drainage manual valve 30 is arranged on the pipeline, the drainage manual valve 30 is opened for drainage in a maintenance period according to an observation window of the dewatering filter 1, and the drainage manual valve 30 is closed after drainage is finished. The flow regulating assembly is used for regulating the flow of the sample gas of the sensor 11, and the vacuum pump 10 realizes the transmission of the sample gas. The sensor 11 sends signals such as methane content, alarm, fault and the like to the control system.
Further, the filtering component comprises a sulfur oxide filter 5 and a particulate matter filter 6, and the sulfur oxide filter 5 and the particulate matter filter 6 are sequentially connected between the gas exhaust explosion-proof flow switch 2 and the flow regulating component. When the gas passes through the sulfur oxide filter 5 and the particulate filter 6 in this order, the sulfur oxide and the particulate in the gas are removed.
Further, the flow control subassembly includes flow control valve 8 and flow indicator 9, and flow control valve 8 and flow indicator 9 connect gradually between filter assembly and vacuum pump 10, and both cooperations are used for adjusting the sample gas flow that gets into sensor 11 to carry out accurate measurement to the sample gas.
The air measurement branch is communicated only after the gas turbine 19 is ignited and comprises an air inlet, an air flow explosion-proof switch 3 and a switching electromagnetic valve 4, one end of the air flow explosion-proof switch 3 is connected with the air inlet, and the other end of the air flow explosion-proof switch is connected between the gas exhaust explosion-proof flow switch 2 and the filtering assembly through the switching electromagnetic valve 4. When the methane content in the exhaust gas is measured before the gas turbine 19 is ignited, the gas exhaust explosion-proof flow switch 2 in the exhaust gas measuring passage is communicated with the filter assembly, and the air inlet is not communicated with the filter assembly under the action of the switching electromagnetic valve 4. After the gas turbine 19 is ignited, the exhaust gas measurement channel is switched to the air measurement branch by the switching solenoid valve 4. After switching, the air inlet is communicated with the filtering component, and the gas exhaust explosion-proof flow switch 2 is not communicated with the filtering component.
Further, through the cooperation of the gas exhaust explosion-proof flow switch 2 and the air flow explosion-proof switch 3, whether the switching of the switching electromagnetic valve 4 is successful or not can be judged, so that the problem of equipment damage caused by unsuccessful switching is avoided.
The on-line calibration measurement branch comprises a calibration gas cylinder 18, a calibration pressure reducing valve 17 and a calibration electromagnetic valve 7, the calibration gas cylinder 18 is connected between the filtering component and the flow regulating component through the calibration electromagnetic valve 7, and the calibration pressure reducing valve 17 is arranged between the calibration gas cylinder 18 and the calibration electromagnetic valve 7. When calibration is needed, the control system sends an instruction to the sensor 11, and the sensor 11 feeds back a signal in the process of calibration to the control system when calibration is needed. When the methane content in the exhaust gas is measured before the gas turbine 19 is ignited, the flow regulating component in the exhaust gas measuring passage is communicated with the filtering component and is not communicated with the calibration gas cylinder 18 under the action of the calibration electromagnetic valve 7. After the gas turbine 19 is ignited or when the unit is in a shutdown state and needs to be calibrated, the exhaust measurement passage needs to be switched to an online calibration measurement branch through the calibration electromagnetic valve 7, and after the switching, the flow regulation assembly is communicated with the calibration gas cylinder 18 and is not communicated with the filtering assembly.
The control system is respectively connected with the gas exhaust explosion-proof flow switch 2, the air flow explosion-proof switch 3, the switching electromagnetic valve 4, the calibration electromagnetic valve 7, the vacuum pump 10 and the sensor 11, and is used for receiving signals of the gas exhaust explosion-proof flow switch 2, the air flow explosion-proof switch 3 and the sensor 11 and controlling the switching electromagnetic valve 4, the calibration electromagnetic valve 7, the vacuum pump 10 and the sensor 11.
Before the gas turbine 19 is ignited, the control system controls the switching electromagnetic valve 4 and the calibration electromagnetic valve 7 to communicate the exhaust measurement passage, so that the measurement of the content of the exhaust methane of the gas turbine 19 is realized. After the gas turbine 19 is ignited, the control system controls the switching solenoid valve 4 and the calibration solenoid valve 7 to enable the air inlet to be communicated with the emptying outlet, and therefore air content measurement is achieved. After the gas turbine 19 is ignited or the unit is in a stop state, the control system controls the switching electromagnetic valve 4 and the calibration electromagnetic valve 7 to enable the calibration gas cylinder 18 to be communicated with an emptying outlet, and therefore measurement of calibration gas is achieved.
The control system shares the control system of the gas turbine 19 and comprises an analog quantity input interface 20, a digital quantity input interface I21, a digital quantity input interface II 22, a digital quantity input interface III 23, a digital quantity input interface IV 25, a digital quantity input interface V26, a digital quantity output interface I27, a digital quantity output interface II 28, a digital quantity output interface III 29 and a digital quantity output interface IV 24. The system comprises an analog quantity input interface 20, a digital quantity input interface 21, a digital quantity input interface 25, a digital quantity output interface five 26, a digital quantity output interface three 27, a digital quantity output interface three 29 and a digital quantity output interface three 28, wherein the analog quantity input interface 20 is used for receiving a methane content signal measured by a sensor 11, the digital quantity input interface one 21 is used for receiving an alarm signal sent by the sensor 11, the digital quantity input interface two 22 is used for receiving a fault signal sent by the sensor 11, the digital quantity output interface four 24 is used for sending a calibration instruction to the sensor 11, the digital quantity input interface three 23 is used for receiving a calibration signal sent by the sensor 11, the digital quantity input interface four 25 is used for receiving a trigger signal of an air flow explosion-proof switch 3, the digital quantity input interface five 26 is used for receiving a trigger signal of a gas exhaust explosion-proof flow switch 2, the digital.
Further, an analog quantity signal safety barrier 12 is arranged between the analog quantity input interface 20 and the sensor 11, digital quantity input safety barriers 13 are arranged between the digital quantity input interface I21, the digital quantity input interface II 22, the digital quantity input interface III 23 and the sensor 11, and a digital quantity output safety barrier 14 is arranged between the digital quantity output interface IV 24 and the sensor 11.
In the invention, the gas exhaust explosion-proof flow switch 2, the air flow explosion-proof switch 3, the switching electromagnetic valve 4, the calibration electromagnetic valve 7, the vacuum pump 10 and the sensor 11 are all explosion-proof products; the power supplies of the switching electromagnetic valve 4, the calibration electromagnetic valve 7, the vacuum pump 10 and the sensor 11 adopt redundant 24VDC and are controlled by a control system, and the whole measuring device is safe and stable and has high automation degree.
The implementation principle of the invention is as follows:
as shown in FIG. 1, a sampling interface is arranged on the exhaust section of the gas turbine 19, a measuring device is connected through an instrument tube, and the device is provided with an exhaust section gas inlet, an air inlet, a drain port and a measured gas emptying outlet.
When measuring the gas in the exhaust section of the gas turbine 19 before the ignition of the gas turbine 19: the drainage manual valve 30 is closed, the control system enables the switching electromagnetic valve 4 to be electrified through the first digital quantity output interface 27, and the B, C port in the switching electromagnetic valve 4 is conducted. The control system enables the calibration electromagnetic valve 7 to be de-energized through the second digital quantity output interface 28, and an A, B port in the calibration electromagnetic valve 7 is conducted. The control system starts the operation of the vacuum pump 10 and the operation of the sensor 11 through the digital output interface three 29. Gas at the exhaust section of the gas turbine 19 is dewatered through the dewatering filter 1 under the action of the vacuum pump 10, when flow passes through the gas exhaust anti-explosion flow switch 2, the gas exhaust anti-explosion flow switch 2 triggers a signal, and the control system receives the signal through the digital quantity input interface five 26 to know that the gas turbine 19 is currently in exhaust measurement, and the switching electromagnetic valve 4 is normally operated. The exhaust gas is filtered by a sulfur oxide filter 5 and a particulate matter filter 6 to remove sulfur oxide and particulate matters, then enters a sensor 11 after sequentially passing through a calibration electromagnetic valve 7, a manual regulating valve, a flow indicator 9 and a vacuum pump 10, and is discharged from an exhaust outlet of the device after being measured by the sensor 11. By adjusting the values of the manual regulating valve and the flow indicator 9, the appropriate flow required by the sensor 11 is adjusted. The sensor 11 analyzes the relevant data of the gas turbine 19 exhaust and sends the methane content, the alarm and the fault signal to the control system through an analog input interface 20, a digital input interface I21 and a digital input interface II 22 respectively. The control system uses the methane content and the alarm as judgment conditions for judging whether the gas turbine 19 is ignited or not, and uses the fault as judgment conditions for judging whether the sensor 11 works normally or not.
When switching to measurement air after the gas turbine 19 is fired: the control system enables the switching electromagnetic valve 4 to be de-energized through the first digital quantity output interface 27, and the A, B port of the switching electromagnetic valve 4 is conducted. The control system continuously loses power of the calibration electromagnet 7 through the second digital quantity output interface 28 and keeps the A, B port conducted. The control system keeps the vacuum pump 10 and the sensor 11 running through the digital quantity output interface three 29. When the flow passes, the air flow explosion-proof switch 3 triggers a signal, and the control system receives the signal to know that the air flow is currently measured, so that the switching of the electromagnetic valve 4 is normal in action and the switching is successful. Air enters the sensor 11 after sequentially passing through the sulfur oxide filter 5, the particulate filter 6, the calibration electromagnetic valve 7, the manual regulating valve, the flow indicator 9 and the vacuum pump 10 under the action of the vacuum pump 10, and is discharged from an air outlet of the device after being measured by the sensor 11. The sensor 11 analyzes the relevant data in the air and sends the methane content, the alarm and the fault signal to the control system. The control system takes the methane content, the alarm and the fault as the judgment conditions for judging whether the sensor 11 works normally, and the signals are used for equipment maintenance.
After the ignition of the gas turbine 19 or when the unit is switched to the online calibration in a shutdown state: the calibration gas is stored in a calibration gas cylinder 18, and a suitable calibration pressure is set by a calibration pressure reducing valve 17. During calibration, the switching solenoid valve 4 is in a power-off state, and the A, B port in the switching solenoid valve 4 is conducted. The control system enables the calibration electromagnetic valve 7 to be electrified through the second digital output interface 28, the port B, C is conducted, the air flow explosion-proof switch 3 and the gas exhaust explosion-proof flow switch 2 do not trigger signals, and the control system does not receive the signals through the fourth digital input interface 25 and the fifth digital input interface 26 and serves as a judgment condition for being in a calibration mode. The control system keeps the vacuum pump 10 and the sensor 11 running. The control system sends a "calibration" command to the sensor 11 through the digital quantity output interface four 24, the sensor 11 starts calibration, and sends "calibration in" to the control system. And if the methane content of the measurement result of the sensor 11 is consistent with the calibration gas parameter, the calibration is finished. The system needs calibration when running for the first time, then periodically calibrates according to the running condition, and the calibration gas passes through the sensor 11 and is discharged through the vent outlet.
Example 2
This example is substantially the same as example 1, with the main differences: the device is provided with a cabinet body, and an exhaust measurement passage, an air measurement branch and an online calibration measurement branch are all fixed in the cabinet body. In addition, in order to facilitate the present invention to be applicable to cold regions, a heater 15 and a heating switch 16 are further provided in the cabinet. The power supply to the heater 15 is 220VAC, controlled by the heating switch 16. The temperature of the heater 15 is adjustable, the space in the cabinet can be heated through the heater 15, and the device is prevented from being incapable of working normally due to cold.
While the invention has been described with reference to specific embodiments, any feature disclosed in this specification may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise; all of the disclosed features, or all of the method or process steps, may be combined in any combination, except mutually exclusive features and/or steps.
Claims (9)
1. An apparatus for measuring the methane content of a gas turbine exhaust, comprising: comprises a control system, an exhaust measuring passage, an air measuring branch and an on-line calibration measuring branch, wherein,
the exhaust measurement channel comprises an exhaust section gas inlet, a water removal filter (1), a gas exhaust explosion-proof flow switch (2), a filtering assembly, a flow regulation assembly, a vacuum pump (10), a sensor (11) and a venting outlet which are connected in sequence;
the air measurement branch comprises an air inlet, an air flow explosion-proof switch (3) and a switching electromagnetic valve (4), one end of the air flow explosion-proof switch (3) is connected with the air inlet, and the other end of the air flow explosion-proof switch is connected between the gas exhaust explosion-proof flow switch (2) and the filtering assembly through the switching electromagnetic valve (4);
the on-line calibration measurement branch comprises a calibration gas cylinder (18), a calibration pressure reducing valve (17) and a calibration electromagnetic valve (7), the calibration gas cylinder (18) is connected between the filtering component and the flow regulating component through the calibration electromagnetic valve (7), and the calibration pressure reducing valve (17) is arranged between the calibration gas cylinder (18) and the calibration electromagnetic valve (7);
the control system is respectively connected with the gas exhaust explosion-proof flow switch (2), the air flow explosion-proof switch (3), the switching electromagnetic valve (4), the calibration electromagnetic valve (7), the vacuum pump (10) and the sensor (11), and is used for receiving signals of the gas exhaust explosion-proof flow switch (2), the air flow explosion-proof switch (3) and the sensor (11) and controlling the switching electromagnetic valve (4), the calibration electromagnetic valve (7), the vacuum pump (10) and the sensor (11).
2. The apparatus of claim 1, wherein the apparatus is configured to measure the methane content of the gas turbine exhaust: before the gas turbine (19) is ignited, the control system controls the switching electromagnetic valve (4) and the calibration electromagnetic valve (7) to communicate the exhaust measurement passage, so that the measurement of the content of the exhaust methane of the gas turbine (19) is realized; after the gas turbine (19) is ignited, the control system controls the switching electromagnetic valve (4) and the calibration electromagnetic valve (7) to enable the air inlet to be communicated with the emptying outlet, so that the measurement of the air content is realized; after the gas turbine (19) is ignited or when the unit is in a stop state, the control system controls the switching electromagnetic valve (4) and the calibration electromagnetic valve (7) to enable the calibration gas cylinder (18) to be communicated with the emptying outlet, and therefore measurement of calibration gas is achieved.
3. The apparatus for measuring the methane content of a gas turbine exhaust according to claim 1 or 2, wherein: the control system comprises an analog quantity input interface (20), a digital quantity input interface I (21), a digital quantity input interface II (22), a digital quantity input interface III (23), a digital quantity input interface IV (25), a digital quantity input interface IV (26), a digital quantity output interface I (27), a digital quantity output interface II (28), a digital quantity output interface III (29) and a digital quantity output interface IV (24), wherein the analog quantity input interface I (20) is used for receiving a methane content signal measured by a sensor (11), the digital quantity input interface I (21) is used for receiving an alarm signal sent by the sensor (11), the digital quantity input interface II (22) is used for receiving a fault signal sent by the sensor (11), the digital quantity output interface IV (24) is used for sending a calibration instruction to the sensor (11), and the digital quantity input interface III (23) is used for receiving a calibration signal sent by the sensor (11), the digital quantity input interface IV (25) is used for receiving a trigger signal of the air flow explosion-proof switch (3), the digital quantity input interface V (26) is used for receiving a trigger signal of the gas exhaust explosion-proof flow switch (2), the digital quantity output interface I (27) is used for controlling the action of the switching electromagnetic valve (4), the digital quantity output interface II (28) is used for controlling the action of the calibration electromagnetic valve (7), and the digital quantity output interface III (29) is used for controlling the start and stop of the vacuum pump (10) and the sensor (11).
4. The apparatus of claim 3, wherein the apparatus further comprises: an analog quantity signal safety barrier (12) is arranged between the analog quantity input interface (20) and the sensor (11), digital quantity input safety barriers (13) are arranged between the digital quantity input interface I (21), the digital quantity input interface II (22), the digital quantity input interface III (23) and the sensor (11), and a digital quantity output safety barrier (14) is arranged between the digital quantity output interface IV (24) and the sensor (11).
5. The apparatus of claim 1, wherein the apparatus is configured to measure the methane content of the gas turbine exhaust: the filtering component comprises a sulfur oxide filter (5) and a particulate matter filter (6), and the sulfur oxide filter (5) and the particulate matter filter (6) are sequentially connected between the gas exhaust explosion-proof flow switch (2) and the flow regulating component.
6. The apparatus of claim 1, wherein the apparatus is configured to measure the methane content of the gas turbine exhaust: the flow regulating assembly comprises a flow regulating valve (8) and a flow indicator (9), and the flow regulating valve (8) and the flow indicator (9) are sequentially connected between the filtering assembly and the vacuum pump (10).
7. The apparatus of claim 1, wherein the apparatus is configured to measure the methane content of the gas turbine exhaust: the dewatering filter (1) is externally connected with a drain port through a pipeline, and a drain manual valve (30) is arranged on the pipeline.
8. An apparatus for measuring the methane content of a gas turbine exhaust according to any one of claims 1, 2, 4, 5, 6 or 7, wherein: the device is provided with a cabinet body, and an exhaust measurement passage, an air measurement branch and an online calibration measurement branch are all fixed in the cabinet body.
9. The apparatus of claim 8, wherein the apparatus further comprises: the cabinet body is internally provided with a heater (15) and a heating switch (16) for controlling the heater (15).
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| CN202110264588.1A CN113030387A (en) | 2021-03-11 | 2021-03-11 | Device for measuring content of methane discharged by gas turbine |
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| CN202110264588.1A CN113030387A (en) | 2021-03-11 | 2021-03-11 | Device for measuring content of methane discharged by gas turbine |
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