CN114452581B - Fault diagnosis device and method for compressed air foam fire extinguishing system of extra-high voltage converter station - Google Patents
Fault diagnosis device and method for compressed air foam fire extinguishing system of extra-high voltage converter station Download PDFInfo
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- CN114452581B CN114452581B CN202210163157.0A CN202210163157A CN114452581B CN 114452581 B CN114452581 B CN 114452581B CN 202210163157 A CN202210163157 A CN 202210163157A CN 114452581 B CN114452581 B CN 114452581B
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
- A62C37/50—Testing or indicating devices for determining the state of readiness of the equipment
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C3/00—Fire prevention, containment or extinguishing specially adapted for particular objects or places
- A62C3/16—Fire prevention, containment or extinguishing specially adapted for particular objects or places in electrical installations, e.g. cableways
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C31/00—Delivery of fire-extinguishing material
- A62C31/02—Nozzles specially adapted for fire-extinguishing
- A62C31/12—Nozzles specially adapted for fire-extinguishing for delivering foam or atomised foam
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C37/00—Control of fire-fighting equipment
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- A—HUMAN NECESSITIES
- A62—LIFE-SAVING; FIRE-FIGHTING
- A62C—FIRE-FIGHTING
- A62C5/00—Making of fire-extinguishing materials immediately before use
- A62C5/02—Making of fire-extinguishing materials immediately before use of foam
Abstract
The invention provides a fault diagnosis device and a fault diagnosis method for a compressed air foam fire extinguishing system of an extra-high voltage converter station, wherein a foam equivalent test port is used for periodically simulating the cold spraying of the actual working condition in a safe region, so that the compressed air foam generating device is subjected to full-function and full-effect diagnosis; the method is characterized in that an air compressor of a compressed air foam generating device is used as an air source, compressed air is used as a medium, and equivalent automatic diagnosis and identification are carried out on a partition valve, a foam pipe network and a compressed air foam releasing device by monitoring the comparison condition of pressure changes at different positions and a characteristic pressure change curve when a system is intact and the gas flow condition. The invention has the outstanding characteristics of strong operability, high efficiency, low cost, safety and reliability, can be widely applied to large-scale ultra/extra-high voltage converter stations and transformer substations with high voltage and electrification, and obviously improves the reliability of the novel high-efficiency compressed air foam fire extinguishing system.
Description
Technical Field
The invention relates to the technical field of foam fire extinguishing of an extra-high voltage converter station, in particular to a fault diagnosis device and method of a compressed air foam fire extinguishing system of an extra-high voltage converter station.
Background
The large-scale converter transformer of the extra-high voltage converter station has high voltage level, large oil storage capacity, long full-load operation time, strong burst property, complex fire form, multiple uncertain factors and large fire extinguishing difficulty when an explosion and fire accident happens, and the conventional fire extinguishing system cannot meet the requirement. The compressed air foam fire extinguishing system based on positive pressure foaming has the outstanding advantages of high fire extinguishing efficiency, excellent re-ignition resistance and heat insulation protection performance, strong explosion impact resistance and high temperature resistance and the like, can quickly and effectively extinguish the hot oil fire of the large-scale converter transformer of the extra-high voltage converter station under extremely complex conditions, and gradually becomes an important fire extinguishing means of the extra-high voltage converter station at present.
A compressed air foam fire extinguishing system relates to a gas-liquid-foam ternary two-phase accurate mixing technology, is one of fire extinguishing systems with the most elements and the most complex structure, and how to ensure the reliability of the compressed air foam fire extinguishing system in practical application is a problem to be solved urgently in extensive engineering popularization and application. In the prior art, CN202020401612.2, CN202010568325.5 and the like mainly focus on the arrangement and application mode of compressed air foam in an extra-high voltage converter transformer, so that the full coverage and fire extinguishing protection of the compressed air foam on key parts are realized, and the operation and maintenance diagnosis and reliability guarantee problems in actual engineering are not considered. Because the extra-high voltage converter station belongs to a high-voltage live site, particularly the voltage of a large converter transformer is over 800kV, once the converter station is put into operation, foam is forbidden to be sprayed in the whole high-voltage live area, otherwise normal power transmission and transmission are affected, and further the safety of a power grid is affected, foam cannot be sprayed in the transformer area in practical engineering application, or the foam can only be simply sprayed through a bypass port or a fire hydrant port, the characteristic difference with a release device under practical working conditions is large, and the foam flow or performance cannot be really detected. Therefore, the compressed air foam fire extinguishing system can not be started regularly and the compressed air foam can not be sprayed for inspection, the problem of system failure is difficult to find in time, and great hidden danger exists. In addition, under normal conditions, the compressed air foam fire extinguishing system of the extra-high voltage converter station has low use frequency, and is not used for a long time, so that related parts are easy to break down, and if the operation and maintenance are not timely, the fire extinguishing system is easy to lose efficacy, and great hidden dangers exist. At present, no diagnosis technical scheme related to improvement of the operation reliability of a compressed air foam fire extinguishing system and each part of the extra-high voltage converter station is available.
The compressed air foam generating device, the valve, the pipe network and the releasing device are key components which influence the foam performance and determine whether fire can be finally extinguished, and once the compressed air foam generating device cannot be normally started to operate or the foam flow and the performance cannot be expected, the partition valve is not tightly sealed, the pipe network leaks, and the releasing device is blocked or leaks, the compressed air foam spraying coverage and the final fire extinguishing are seriously influenced. Meanwhile, the arrangement modes of the compressed air foam pipe networks in actual engineering are different, a large number of hidden projects exist, manual field direct inspection is inconvenient, and hidden danger problems are difficult to find. Therefore, a scientific automatic diagnosis technology is urgently needed for key components such as a compressed air foam generating device, a valve, a pipe network and the like, and faults which seriously affect the reliability of the compressed air foam fire extinguishing system of the ultrahigh-voltage converter station are timely discovered and eliminated through periodic diagnosis, so that the fire extinguishing system can be really guaranteed to play a role at a key moment.
Disclosure of Invention
In view of the defects of the prior art, the invention provides a fault diagnosis device and a fault diagnosis method for a compressed air foam fire extinguishing system of an extra-high voltage converter station.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a fault diagnosis device for a compressed air foam fire extinguishing system of an extra-high voltage converter station comprises a compressed air foam generating device and a foam pipe network connected with the compressed air foam generating device, wherein the foam pipe network covers a plurality of transformer areas, a partition valve is arranged for each transformer area, the foam pipe network is connected in front of the partition valve, and a compressed air foam releasing device is connected behind the partition valve; the fault diagnosis device comprises a diagnosis valve group, a foam equivalent test port, a plurality of pressure sensors, a plurality of airflow indicating alarms and a data acquisition unit;
the diagnosis valve group comprises a diagnosis valve A arranged on a foam pipeline of the compressed air foam generating device and a diagnosis valve B arranged on a foam pipeline bypass, and the foam equivalent test port is arranged in an uncharged safe area and is communicated with the diagnosis valve B through a pipeline;
a pressure sensor is arranged in front of each partition valve of the foam pipe network, an airflow indicating alarm is arranged behind each partition valve, and the pressure sensor and the airflow indicating alarm are connected with the data acquisition unit through signal control lines or in a wireless mode;
the compressed air foam generating device is characterized in that a compressed air electric control valve is arranged on a compressed air pipeline, and a mixed liquid electric control valve is arranged on a mixed liquid pipeline of water and foam liquid.
Furthermore, the foam equivalent test port is a straight-through circular pipe with a static mixer arranged inside, the inner diameter of the straight-through circular pipe is equal to the equivalent diameter of a compressed air foam release device used in each transformer area at the same time, and the static mixer is used for simulating the mixing and pressure loss of compressed air foam in a long-distance pipeline and realizing the equivalence of the foam mixing and pressure loss in the pipeline.
Further, the static mixer has a length of 0.0005 to 0.005 times a length of the foam pipe from the compressed air foam generating apparatus to the farthest transformer area.
Preferably, the compressed air foam generating device comprises a fire pump, a foam liquid tank, a foam liquid pump, an air compressor and a gas-liquid mixer; the foam liquid of the foam liquid tank is controlled by a foam liquid pump to be mixed with high-pressure water conveyed by a fire pump, and the mixture enters a mixed liquid pipeline and enters a gas-liquid mixer through the mixed liquid pipeline; the air compressor controls compressed air to enter the gas-liquid mixer through a compressed air pipeline; the gas-liquid mixer outputs foam from a foam pipe.
Further, a buffer air tank is arranged between the air compressor and the compressed air pipeline.
The invention also provides a fault diagnosis method for the compressed air foam fire extinguishing system of the extra-high voltage converter station, which comprises the following steps:
s1, regularly simulating actual working condition cold spraying in a safe area by using a foam equivalent test port, and performing full-function and full-effect diagnosis on a compressed air foam generating device; the foam equivalent test port adopts a straight-through type circular pipe internally provided with a static mixer, the inner diameter of the straight-through type circular pipe is equal to the equivalent diameter of a compressed air foam release device simultaneously used in each transformer area, and the static mixer is used in the straight-through type circular pipe to simulate the mixing and pressure loss of compressed air foam in a long-distance pipeline, so that the equivalence of the foam mixing and pressure loss in the pipeline is realized;
and S2, performing equivalent automatic diagnosis and identification on the partition valve, the foam pipe network and the compressed air foam release device by monitoring the comparison condition of pressure changes at different positions and a characteristic pressure change curve when the system is intact and the gas flow condition by using an air compressor of the compressed air foam generation device as an air source and using compressed air as a medium.
Further, the specific test procedure of step S1 includes:
s101, diagnosing the function of a compressed air foam generating device;
a diagnosis valve A is arranged on a foam pipeline of the compressed air foam generating device, a diagnosis valve B is arranged on a bypass of the foam pipeline, and the foam equivalent test port is arranged in an uncharged safe area and is communicated with the diagnosis valve B through a pipeline;
closing the diagnosis valve A, opening the diagnosis valve B, starting the compressed air foam generating device, generating compressed air foam according to actual working conditions, spraying the compressed air foam to an uncharged safe area through a foam equivalent test port, diagnosing and identifying whether the compressed air foam generating device can normally spray the foam or not and judging whether functional faults exist or not; if not, sending a fault alarm signal to remind of maintenance, and if so, continuing the next step;
s102, analyzing the performance of a compressed air foam generating device;
continuously and stably spraying foam to an uncharged safe area for 2min through a foam equivalent test port, recording the flow rate, the mixing ratio, the gas-liquid ratio and the pressure of a foam mixture, testing the foaming times and the 25% liquid separating time by referring to a standard method of GB27897, comparing with design parameters, and diagnosing and identifying whether the compressed air foam generating device can meet the design requirements.
Further, the static mixer length is 0.0005 to 0.005 times the length of the foam pipe from the compressed air foam generating apparatus to the farthest transformer region.
Further, the specific diagnosis process of step S2 includes:
s201, diagnosing performance of a partition valve and a partition valve front pipe network;
a compressed air electric control valve is arranged on a compressed air pipeline of the compressed air foam generating device, and a mixed liquid electric control valve is arranged on a mixed liquid pipeline of water and foam liquid of the compressed air foam generating device; a pressure sensor is arranged in front of each partition valve of the foam pipe network, an airflow indicating alarm is arranged behind each partition valve, and the pressure sensor and the airflow indicating alarm are connected with the data acquisition unit through signal control lines or in a wireless mode;
closing the mixed liquid electric control valve, opening the compressed air electric control valve, closing all partition valves, starting the air compressor to pressurize the foam pipe network, stopping the air compressor after a pressure sensor in front of the partition valves reaches a characteristic pressure, maintaining the pressure for a plurality of minutes, monitoring each airflow indicating alarm in real time, detecting whether the partition valves leak or are not sealed tightly, and alarming to remind maintenance if the airflow indicating alarms alarm exists; acquiring and recording the pressure change curve of the pipe network in front of each partition valve in real time, and if the pressure change curve is inconsistent with the pressure characteristic curve measured under the intact condition of the system and the final pipe network pressure is lower than the characteristic pressure by more than 0.2MPa, sending a pipe network leakage alarm signal to remind of maintenance; if the pressure change curve is consistent with a pressure characteristic curve measured under the condition that the system is intact and the final pressure value of the pipe network is lower than the characteristic pressure value by not more than 0.2MPa, exhausting the gas of the pipe network and continuing the next diagnosis;
s202, diagnosing the performance of the pipe network behind the foam release device and the partition valve;
starting a partition valve of a certain partition, starting an air compressor, continuing to stably supply air for 1min after the pressure of a pipe network in front of the partition valve is stable, acquiring a pressure change curve of the pipe network in front of the partition valve in real time, and if the pressure change curve is inconsistent with a pressure characteristic curve measured under the condition that a system is intact, sending a foam release device and a fault alarm signal of the pipe network behind the partition valve to remind of maintenance; if the pressure profile corresponds to the pressure characteristic curve measured in the intact system, the partition valve is closed and the diagnosis of the next partition valve is continued.
Compared with the prior art, the invention has the following beneficial effects:
(1) According to the invention, the special diagnostic valve group and the equivalent test port are arranged at the foam outlet of the compressed air foam generating device, and the cold spray test is regularly carried out in a designated safe area, so that the full-function and full-effect diagnosis is carried out on the foam generating device, the hidden danger is found in time, the reliability of the fire extinguishing system is obviously improved, and the problem that the operation and maintenance of the foam cannot be carried out in a high-voltage electrified place is solved;
(2) According to the composition and the characteristics of the compressed air foam fire extinguishing system, pure compressed air is used as a medium, all the partition valves are closed, the pressure of a pipe network in front of the partition valves and the characteristic pressure change under the condition of intact system are monitored, contrastively analyzed, the state of an alarm is indicated by combining the airflow behind each partition valve, the sealing performance and the leakage hidden danger of the partition valves and the pipe network in front of the valves are automatically diagnosed and identified, and the compressed air foam fire extinguishing system is safe and reliable, high in efficiency, low in cost, suitable for high-voltage electrified places and free from running and overhauling in a power failure state;
(3) The invention utilizes pure compressed air as a medium, monitors and contrasts and analyzes the pressure of a pipe network in front of each partition valve and the characteristic pressure change under the intact condition of the system by respectively and independently opening each partition valve, automatically diagnoses and identifies the blockage or leakage hidden trouble of the release device and the pipe network behind the valve, simultaneously performs air purging and maintenance on the release device, and removes dust, birds and insects in time, and the like, is safe and reliable, has simple operability and low cost, and is particularly suitable for the operation and maintenance inspection of the compressed air foam release device in a high-voltage electrified place;
(4) The invention utilizes the excellent insulating property of compressed air, takes the compressed air as a medium, realizes full-function full-effect automatic diagnosis and identification of the hidden trouble of the fault of key components such as a compressed air foam generating device, a valve, a pipe network, a releasing device and the like by adopting a special diagnosis valve group, an equivalent test port, a pressure sensor, an airflow indicating alarm, a data acquisition device and an original air compressor of a compressed air foam fire extinguishing system, has the outstanding characteristics of strong operability, high efficiency, low cost, safety and reliability, solves the difficult problems of operation, maintenance and reliability guarantee of the compressed air foam fire extinguishing system of the ultra-high voltage converter station, and is widely suitable for the places of large ultra-high voltage/ultra-high voltage converter stations and transformer substations with high voltage electrification.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention, illustrate embodiments of the invention and together with the description serve to explain the invention and do not constitute a limitation of the invention. In the drawings:
FIG. 1 is a schematic structural diagram of a fault diagnosis device of a compressed air foam fire extinguishing system of an extra-high voltage converter station according to an embodiment of the invention;
FIG. 2 is a schematic structural diagram of a foam equivalent test port according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a compressed air foam generating apparatus according to an embodiment of the present invention;
FIG. 4 is a flow chart of a fault diagnosis method of a compressed air foam fire extinguishing system of an extra-high voltage converter station according to an embodiment of the invention;
FIG. 5 is a graph of the pressure characteristic curve A in an embodiment of the present invention;
fig. 6 is a graph of the pressure characteristic curve B in the embodiment of the present invention.
Wherein:
1. a compressed air foam generating device 1-1, a fire pump 1-2, a foam liquid tank 1-3, a foam liquid valve,
1-4 parts of foam liquid pump, 1-5 parts of foam liquid one-way valve, 1-6 parts of flowmeter, 1-7 parts of mixed liquid electric control valve,
1-8 parts of mixed liquid pipeline, 1-9 parts of gas-liquid mixer, 1-10 parts of air compressor, 1-11 parts of buffer gas tank,
1-12 parts of compressed air electric control valve, 1-13 parts of compressed air one-way valve, 2 parts of foam pipeline, 3 parts of diagnosis valve A,
4. diagnosis valves B,5, a foam equivalent test port, 6, a pressure sensor, 7 and a partition valve,
8. an air flow indicator alarm, 9, a compressed air foam release device, 10, a transformer area,
11. a safety region 12, a data collector; 13. a straight-through circular tube; 14. a static mixer.
Detailed Description
In order to further understand the present invention, the following detailed description will be made with reference to the following examples, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
The fault diagnosis device provided by the invention is applied to a compressed air foam fire extinguishing system of an extra-high voltage converter station, the compressed air foam fire extinguishing system of the extra-high voltage converter station comprises a compressed air foam generating device 1 as shown in figure 1, the compressed air foam generating device 1 is connected with a foam pipe network through a foam pipeline 2, the foam pipe network covers a plurality of transformer areas 10, a partition valve 7 is arranged for each transformer area 10, the front of the partition valve 7 is connected with the foam pipe network, and the rear of the partition valve 7 is connected with a compressed air foam releasing device 9.
The compressed air foam generating device 1 can use a conventional compressed air foam generating device, and the compressed air foam generating device 1 with any structure can be provided with an air compressor and a compressed air pipeline. In the embodiment, the compressed air foam generating device 1 is preferably set to be of a structure as shown in fig. 3 and comprises a fire pump 1-1, a foam liquid tank 1-2, a foam liquid pump 1-4, an air compressor 1-10, a buffer air tank 1-11 and a gas-liquid mixer 1-9; the foam liquid tank 1-2 is connected to a foam liquid pump 1-4 through a foam liquid valve 1-3, the foam liquid pump 1-4 controls foam liquid to pass through a foam liquid pipeline provided with a foam liquid one-way valve 1-5, to be mixed with high-pressure water conveyed by a fire pump 1-1, to enter a mixed liquid pipeline 1-8 provided with a flow meter 1-6, and to enter a gas-liquid mixer 1-9 through the mixed liquid pipeline 1-8; the air compressor 1-10 controls compressed air to enter a compressed air pipeline provided with a compressed air one-way valve 1-13 through a buffer air tank 1-11 and enter an air-liquid mixer 1-9 through the compressed air pipeline; the gas-liquid mixer 1-9 is connected with the foam pipeline 2 and outputs foam.
In this embodiment, the fault diagnosis device includes, as shown in fig. 1, a diagnosis valve set, a foam equivalent test port 5, a plurality of pressure sensors 6, a plurality of airflow indicators 8, and a data acquisition unit 12, where the diagnosis valve set includes a diagnosis valve A3 disposed on a foam pipe 2 and a diagnosis valve B4 disposed on a bypass of the foam pipe 2, the foam equivalent test port 5 is disposed in an uncharged safety region 11 and is communicated with the diagnosis valve B4 through a pipe, one pressure sensor 6 is disposed in front of each partition valve 7, and one airflow indication alarm 8 is disposed behind each partition valve 7, the pressure sensors 6 and the airflow indication alarms 8 are connected with the data acquisition unit 12 through signal control lines or in a wireless manner, the data acquisition unit 12 collects and records signals of the pressure sensors 6 and the airflow indication alarms 8 in real time, diagnoses and analyzes pressure changes and gas flow conditions at various positions, and identifies whether a partition valve, a pipe network, and a compressed air foam release device has a fault through data comparison with a system in a perfect condition;
in this embodiment, the fault diagnosis apparatus further includes a compressed air electric control valve 1-12 disposed on the compressed air pipeline of the compressed air foam generating apparatus 1, and a mixed liquid electric control valve 1-7 disposed on a mixed liquid pipeline 1-8 of water and foam liquid of the compressed air foam generating apparatus 1; the specific position is shown in figure 3; if the adopted compressed air foam generating device 1 already has the compressed air electric control valves 1-12 and the mixed liquid electric control valves 1-7, the compressed air foam generating device can be directly used without being additionally arranged.
The diagnosis valve adopts a ZDR type stainless steel electric control ball valve, and the working pressure is not lower than 1.3MPa.
In the embodiment, the foam equivalent test port 5 is adopted instead of a test port or a fire hydrant port which is conventionally reserved in a common fire extinguishing system, the conventionally reserved test port or the fire hydrant port can only observe whether foam can be generated or not, but can not really perform equivalent test, and the foam equivalent test port 5 can equivalently simulate the cold spraying of actual working conditions and reflect the real foam performance sprayed by a foam releasing device. The foam equivalent test port 5 in this embodiment is as shown in fig. 2, a straight-through circular tube 13 is adopted, a static mixer 14 is arranged inside the straight-through circular tube 13, the inner diameter of the straight-through circular tube 13 is equal to the equivalent diameter of a compressed air foam release device 9 used in each transformer area 10 at the same time, so as to ensure that the foam performance is consistent with the actual working condition, the static mixer 14 can adopt an SL type or SK static mixer, the length of the static mixer is 0.0005-0.005 times of the length of a foam pipeline from a compressed air foam generation device to the farthest transformer area, and the static mixer is used for simulating further mixing and pressure loss of compressed air foam in a long-distance pipeline, so as to realize the equivalence of foam mixing and pressure loss in the pipeline. For example, when the compressed air foam releasing device 9 adopts a compressed air foam spray pipe, the inner diameter of the foam equivalent test port 5 (i.e. the inner diameter of the straight-through circular pipe 13) should be the same as the equivalent diameter of all spray pipe foam outlets of one of the transformer areas 10; when the compressed air foam release device 9 adopts two compressed air foam guns, the inner diameter of the foam equivalent test port 5 (namely the inner diameter of the straight-through type circular tube 13) is the same as the equivalent diameter of the outlets of the two foam guns; when the length of the foam pipeline from the compressed air foam generating device 1 to the farthest transformer area 10 is 300m, an SL-type static mixer is arranged in the foam equivalent test port, the length of the static mixer is 0.15-1.5 m, and the optimal length is 0.2m.
In this embodiment, the diagnosis valve A3 and the diagnosis valve B4 are ZDR type stainless steel electrically controlled ball valves, and the working pressure is not lower than 1.3MPa. Pressure sensor 6 adopts TDS type stainless steel pressure sensor, and operating pressure range 0-1.6Mpa, output 4-20mA signal, be connected with data collection station 12 through signal cable or wireless mode. The airflow indicating alarm 8 adopts an SJZT flange type full-blade gas indicating alarm, can monitor the flowing of a small amount of gas and timely sends out an alarm. The data acquisition unit 12 adopts a DP100 type multi-channel data acquisition unit, and can perform comparison analysis on site, or automatically perform comparison analysis by presetting pressure data under the condition that the system is intact.
Through the specific structure of the fault diagnosis device, the fault diagnosis method for the compressed air foam fire extinguishing system of the extra-high voltage converter station, disclosed by the embodiment of the invention, as shown in fig. 4, comprises the following steps:
(1) And (3) functional diagnosis of the compressed air foam generating device: and closing a diagnosis valve A3 of the diagnosis valve group, opening a diagnosis valve B4 of the diagnosis valve group, starting the compressed air foam generating device 1, generating compressed air foam according to actual working conditions, spraying the compressed air foam to an uncharged safe area through a foam equivalent test port 5, and diagnosing and identifying whether the compressed air foam generating device 1 can normally spray the foam or not and whether functional faults exist or not. If not, sending a fault alarm signal to the far end to remind the maintenance and finish the inspection; if yes, continuing to carry out next inspection;
(2) Performance analysis of the compressed air foam generating device: continuously and stably spraying foam to an uncharged safe area for 2min through a foam equivalent test port 5, recording the flow rate, the mixing ratio, the gas-liquid ratio and the pressure of a foam mixed liquid, testing the foaming times and the 25% liquid separating time by referring to a standard method of GB27897, comparing with design parameters, diagnosing and identifying whether the compressed air foam generating device 1 can meet the design requirements, and cleaning the compressed air foam generating device 1 after the completion to enable the compressed air foam generating device 1 to be in a standby state. If not, sending a fault alarm signal to remind the overhaul and finish the inspection; if yes, continuing to carry out next inspection;
(3) And (3) performance diagnosis of the partition valve and the partition valve front pipe network: closing a mixed liquid electric control valve 1-7 of a compressed air foam generating device 1, opening a compressed air electric control valve 1-12 of the compressed air foam generating device 1 and a diagnosis valve A3 of a diagnosis valve group, closing a diagnosis valve B4 of the diagnosis valve group and all partition valves 7, starting an air compressor 1-10 to pressurize a foam pipe network, stopping the air compressor 1-10 after a pressure sensor 6 in front of the partition valves 7 reaches a characteristic pressure, maintaining the pressure for a plurality of minutes, preferably 10min in the embodiment, monitoring each airflow indicating alarm 8 in real time, identifying whether the partition valves are leaked or not tightly sealed, and sending a partition valve fault alarm signal to remind maintenance if the airflow indicating alarm 8 gives an alarm; acquiring and recording the pressure change curve of the pipe network in front of each partition selector valve in real time, and if the pressure change curve is inconsistent with a pressure characteristic curve A (the pressure change curve measured under the condition that the system is intact) shown in the figure 5 and the final pipe network pressure is lower than the characteristic pressure value by more than 0.2MPa, sending a pipe network leakage alarm signal to remind of maintenance; if the pressure change curve is consistent with a pressure characteristic curve A measured under the condition that the system is intact and the pressure of the final pipe network is lower than the characteristic pressure value by not more than 0.2MPa, exhausting the gas of the pipe network and continuing to perform next inspection;
(4) And (3) diagnosing the performance of the pipe network behind the foam release device and the partition valve: starting a partition valve 7 corresponding to a first transformer, starting an air compressor 1-10, continuing to stably supply air for 1min after the pressure of a pipe network in front of the partition valve 7 corresponding to the first transformer is stable, acquiring a pressure change curve of the pipe network in front of the partition valve in real time, and sending a foam release device of the first transformer and a pipe network fault alarm signal behind the partition valve to remind maintenance if the pressure change curve is inconsistent with a pressure characteristic curve B (the pressure change curve measured when a system is intact) shown in FIG. 6; and if the pressure change curve is consistent with the pressure characteristic curve B, exhausting the gas of the pipe network, and continuing to perform next inspection. And sequentially diagnosing the performances of the foam release devices and the partition valves corresponding to all the other transformers according to the steps.
(5) After all diagnoses are finished, cleaning the compressed air foam generating device 1 to enable the compressed air foam generating device to be in a standby state; evacuating the gas in the pipe network to enable a diagnosis valve A3 of the diagnosis valve group to be in a normally open state, a diagnosis valve B4 of the diagnosis valve group to be in a normally closed state and all partition valves 7 of the diagnosis valve group to be in a normally closed state; a diagnostic complete signal is issued.
In summary, the working principle of the invention is as follows: firstly, a diagnosis valve set and a foam equivalent test port 5 are adopted, and a cold spray test for simulating actual working conditions is carried out at a designated safe area regularly, so that full-function and full-effect diagnosis is carried out on a compressed air foam generating device; secondly, an air compressor of the fire extinguishing system is used as an air source, pure compressed air with good insulating property is used as a medium, equivalent automatic diagnosis and identification are carried out on a partition valve, a pipe network and a release device by monitoring the comparison condition of pressure changes at different positions and a characteristic pressure change curve when the system is intact and the gas flowing condition, faults and hidden dangers existing in key parts of the fire extinguishing system are found in time, and maintenance personnel are prompted to maintain.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. A fault diagnosis device for a compressed air foam fire extinguishing system of an extra-high voltage converter station comprises a compressed air foam generating device and a foam pipe network connected with the compressed air foam generating device, wherein the foam pipe network covers a plurality of transformer areas, a partition valve is arranged for each transformer area, the foam pipe network is connected in front of the partition valve, and a compressed air foam releasing device is connected behind the partition valve;
the device is characterized in that the fault diagnosis device comprises a diagnosis valve bank, a foam equivalent test port, a plurality of pressure sensors, a plurality of airflow indication alarms and a data acquisition unit;
the diagnosis valve group comprises a diagnosis valve A arranged on a foam pipeline of the compressed air foam generating device and a diagnosis valve B arranged on a foam pipeline bypass, and the foam equivalent test port is arranged in an uncharged safe area and is communicated with the diagnosis valve B through a pipeline;
a pressure sensor is arranged in front of each partition valve of the foam pipe network, an airflow indicating alarm is arranged behind each partition valve, and the pressure sensor and the airflow indicating alarm are connected with the data acquisition unit through signal control lines or in a wireless mode;
the compressed air foam generating device is characterized in that a compressed air electric control valve is arranged on a compressed air pipeline, and a mixed liquid electric control valve is arranged on a mixed liquid pipeline of water and foam liquid;
the foam equivalent test port is a straight-through circular pipe with a static mixer arranged inside, the inner diameter of the straight-through circular pipe is equal to the equivalent diameter of a compressed air foam release device used in each transformer area at the same time, and the static mixer is used for simulating the mixing and pressure loss of compressed air foam in a long-distance pipeline and realizing the equivalence of the foam mixing and pressure loss in the pipeline;
the length of the static mixer is 0.0005 to 0.005 times of the length of a foam pipeline from a compressed air foam generating device to the farthest transformer area.
2. The fault diagnosis device for the compressed air foam fire extinguishing system of the extra-high voltage converter station according to claim 1, wherein the compressed air foam generating device comprises a fire pump, a foam liquid tank, a foam liquid pump, an air compressor and a gas-liquid mixer; the foam liquid of the foam liquid tank is controlled by a foam liquid pump and mixed with high-pressure water conveyed by a fire pump to enter a mixed liquid pipeline, and the mixed liquid enters a gas-liquid mixer through the mixed liquid pipeline; the air compressor controls compressed air to enter the gas-liquid mixer through a compressed air pipeline; the gas-liquid mixer outputs foam from a foam pipe.
3. The device for diagnosing the fault of the compressed air foam fire extinguishing system of the extra-high voltage converter station according to claim 2, wherein a buffer gas tank is further arranged between the air compressor and the compressed air pipeline.
4. The method for applying the fault diagnosis device of the compressed air foam fire extinguishing system of the extra-high voltage converter station according to any one of claims 1 to 3, is characterized by comprising the following steps:
s1, periodically simulating cold spraying under actual working conditions in a safe region by using a foam equivalent test port, and performing full-function full-effect diagnosis on a compressed air foam generating device; the foam equivalent test port adopts a straight-through type circular pipe internally provided with a static mixer, the inner diameter of the straight-through type circular pipe is equal to the equivalent diameter of a compressed air foam release device simultaneously used in each transformer area, and the static mixer is used in the straight-through type circular pipe to simulate the mixing and pressure loss of compressed air foam in a long-distance pipeline, so that the equivalence of the foam mixing and pressure loss in the pipeline is realized;
s2, performing equivalent automatic diagnosis and identification on a partition valve, a foam pipe network and a compressed air foam release device by monitoring the comparison condition of pressure changes at different positions and a characteristic pressure change curve when a system is intact and the gas flow condition by using an air compressor of a compressed air foam generation device as an air source and using compressed air as a medium;
the length of the static mixer is 0.0005 to 0.005 time of the length of a foam pipeline from a compressed air foam generating device to the farthest transformer area.
5. The method according to claim 4, wherein the specific test procedure of step S1 comprises:
s101, diagnosing the function of a compressed air foam generating device;
a diagnosis valve A is arranged on a foam pipeline of the compressed air foam generating device, a diagnosis valve B is arranged on a bypass of the foam pipeline, and the foam equivalent test port is arranged in an uncharged safe area and is communicated with the diagnosis valve B through a pipeline;
closing the diagnosis valve A, opening the diagnosis valve B, starting the compressed air foam generating device, generating compressed air foam according to actual working conditions, spraying the compressed air foam to an uncharged safe area through a foam equivalent test port, and diagnosing and identifying whether the compressed air foam generating device can normally spray the foam or not and whether functional faults exist or not; if not, sending a fault alarm signal to remind of maintenance, and if so, continuing the next step;
s102, analyzing the performance of a compressed air foam generating device;
continuously and stably spraying foam to an uncharged safe area for 2min through a foam equivalent test port, recording the flow rate, the mixing ratio, the gas-liquid ratio and the pressure of foam mixed liquid, testing the foaming times and the 25% liquid separating time by referring to a standard method of GB27897, comparing with design parameters, and diagnosing and identifying whether the compressed air foam generating device can meet the design requirements.
6. The method according to claim 4, wherein the specific diagnosis process of step S2 comprises:
s201, diagnosing performance of a partition valve and a partition valve front pipe network;
a compressed air electric control valve is arranged on a compressed air pipeline of the compressed air foam generating device, and a mixed liquid electric control valve is arranged on a mixed liquid pipeline of water and foam liquid of the compressed air foam generating device; a pressure sensor is arranged in front of each partition valve of the foam pipe network, an airflow indicating alarm is arranged behind each partition valve, and the pressure sensor and the airflow indicating alarm are connected with the data acquisition unit through signal control lines or in a wireless mode;
closing the mixed liquid electric control valve, opening the compressed air electric control valve, closing all partition valves, starting the air compressor to pressurize the foam pipe network, stopping the air compressor after a pressure sensor in front of the partition valves reaches a characteristic pressure, maintaining the pressure for a plurality of minutes, monitoring each airflow indicating alarm in real time, detecting whether the partition valves leak or are not sealed tightly, and alarming to remind maintenance if the airflow indicating alarms alarm exists; acquiring and recording the pressure change curve of the pipe network in front of each partition valve in real time, and if the pressure change curve is inconsistent with the measured pressure characteristic curve under the condition that the system is intact and the final pipe network pressure is lower than the characteristic pressure by more than 0.2MPa, sending a pipe network leakage alarm signal to remind maintenance; if the pressure change curve is consistent with a pressure characteristic curve measured under the condition that the system is intact and the final pressure value of the pipe network is lower than the characteristic pressure value by not more than 0.2MPa, exhausting the gas of the pipe network and continuing the next diagnosis;
s202, diagnosing the performance of the pipe network behind the foam release device and the partition valve;
starting a partition valve of a certain partition, starting an air compressor, continuously and stably supplying air for 1min after the pressure of a pipe network in front of the partition valve is stable, acquiring a pressure change curve of the pipe network in front of the partition valve in real time, and if the pressure change curve is inconsistent with a pressure characteristic curve measured under the condition that a system is intact, sending a foam release device and a pipe network behind the partition valve fault alarm signal to remind maintenance; if the pressure profile corresponds to the pressure characteristic curve measured in the intact system, the partition valve is closed and the diagnosis of the next partition valve is continued.
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| CN115025434B (en) * | 2022-05-11 | 2023-01-31 | 国网安徽省电力有限公司电力科学研究院 | Extra-high voltage converter station fire extinguishing system performance detection device |
| CN115025436B (en) * | 2022-05-11 | 2023-01-31 | 国网安徽省电力有限公司电力科学研究院 | Compressed air foam detection system suitable for daily operation and maintenance |
| CN115025435B (en) * | 2022-05-11 | 2023-01-31 | 国网安徽省电力有限公司电力科学研究院 | Compressed air foam detection system applied to three-side firewall building |
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