CN113281111B - Safe explosion-proof detection device and system - Google Patents
Safe explosion-proof detection device and system Download PDFInfo
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- CN113281111B CN113281111B CN202110551272.0A CN202110551272A CN113281111B CN 113281111 B CN113281111 B CN 113281111B CN 202110551272 A CN202110551272 A CN 202110551272A CN 113281111 B CN113281111 B CN 113281111B
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- 238000001514 detection method Methods 0.000 title claims abstract description 59
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims abstract description 206
- 239000003595 mist Substances 0.000 claims abstract description 151
- 239000003345 natural gas Substances 0.000 claims abstract description 103
- 239000007789 gas Substances 0.000 claims abstract description 42
- 238000005070 sampling Methods 0.000 claims abstract description 39
- 238000004880 explosion Methods 0.000 claims abstract description 38
- 238000000605 extraction Methods 0.000 claims abstract description 20
- 238000005259 measurement Methods 0.000 claims description 10
- 238000009826 distribution Methods 0.000 claims description 9
- 238000003860 storage Methods 0.000 claims description 9
- 238000004891 communication Methods 0.000 claims description 5
- 238000005086 pumping Methods 0.000 claims description 2
- 239000000523 sample Substances 0.000 claims description 2
- 239000000203 mixture Substances 0.000 abstract description 11
- 239000006185 dispersion Substances 0.000 abstract description 7
- 230000036632 reaction speed Effects 0.000 abstract description 6
- 238000000034 method Methods 0.000 abstract description 3
- 239000003921 oil Substances 0.000 description 120
- 239000000446 fuel Substances 0.000 description 17
- 230000000087 stabilizing effect Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
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- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000002360 explosive Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 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
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/06—Investigating concentration of particle suspensions
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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
- G01N33/0057—Warfare agents or explosives
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- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B21/00—Alarms responsive to a single specified undesired or abnormal condition and not otherwise provided for
- G08B21/02—Alarms for ensuring the safety of persons
- G08B21/12—Alarms for ensuring the safety of persons responsive to undesired emission of substances, e.g. pollution alarms
- G08B21/16—Combustible gas alarms
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/2247—Sampling from a flowing stream of gas
- G01N2001/227—Sampling from a flowing stream of gas separating gas from solid, e.g. filter
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/22—Devices for withdrawing samples in the gaseous state
- G01N1/24—Suction devices
- G01N2001/248—Evacuated containers
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Abstract
The invention provides a safe explosion-proof detection device and a system. The safety explosion-proof detection device comprises an oil mist measuring chamber, an oil mist filter, a natural gas measuring chamber, an air extraction sampling device and a central controller. The invention can monitor and alarm the concentration of the oil mist and gas mixture in the crankcase of the marine engine, can effectively reduce the explosion danger of large ships in the operation process, can independently detect the oil mist concentration of the crankcase of each engine and the natural gas concentration, can also simultaneously detect the mixing ratio of the oil mist concentration and the natural gas concentration in different concentration ranges, and directly judges whether the explosion danger exists according to the gas mixing ratio, so that the explosion-proof reaction speed is higher than that of the traditional natural dispersion sampling, and the operation safety of the ship of a safety explosion-proof detection system can be better ensured after the explosion-proof reaction system is applied.
Description
Technical Field
The invention relates to the technical field of safety explosion-proof devices, in particular to a safety explosion-proof detection device and a safety explosion-proof detection system, which are applied to a marine dual-fuel engine or two engine sets with different fuels and can monitor the concentration of oil mist and gas mixture in a crankcase of the marine engine.
Background
During the operation of the marine diesel engine, the oil mist concentration of the crankcase is one of the main indicators for determining whether the diesel engine is safe, and the oil mist of the crankcase reaches the ignition point due to various faults, so that the explosion of the box body can be caused, and serious consequences can be generated in the aspects of economy and personal safety. Therefore, according to the entry code of steel seagoing vessels, the crankcase should be equipped with an oil mist detection device for high-power or large-cylinder marine diesel engines. However, for dual-fuel engines, because the oil mist component in the crankcase is different from that of the crankcase oil mist component of the traditional diesel engine due to different fuel properties, it is necessary to develop a device for detecting the mixture of oil mist and gas for the dual-fuel engines. The device can detect the oil mist concentration and the natural gas concentration in the crankcase of the dual-fuel engine in real time, is provided with an alarm signal, and controls the host to decelerate or stop when the oil mist concentration or the natural gas concentration exceeds a set value.
The oil mist and gas mixed detection device of the dual-fuel engine is different from a traditional oil mist detector, is not only suitable for oil mist detection of a common marine diesel engine, but also suitable for the dual-fuel engine, can be used for respectively monitoring the concentration of oil mist and the concentration of natural gas, and has greater innovation. However, at present, a safe explosion-proof detection device capable of monitoring and alarming the concentration of the oil mist and gas mixture in the crankcase of the marine engine is lacked.
In view of the above problems, there is an urgent need for a safety explosion-proof detection device and system applied to a marine dual-fuel engine, which provide a better detection measure for the safety explosion-proof of a large-sized ship and further improve the safety and stability of the ship.
Disclosure of Invention
The invention aims to provide a safety explosion-proof detection device and a safety explosion-proof detection system applied to a marine dual-fuel engine, which can be used for solving the technical problem that a safety explosion-proof detection device capable of monitoring and alarming the concentration of oil mist and gas mixed gas (natural gas) in a crankcase of the marine engine is lacked at present.
In order to achieve the purpose, the invention provides a safe explosion-proof detection device which comprises an oil mist measuring chamber, an oil mist filter, a natural gas measuring chamber, an air extraction sampling device and a central controller. The oil mist measuring chamber is communicated with a crankcase of an engine and is connected to the vacuum generator; the oil mist filter is connected to the oil mist measuring chamber; the natural gas measuring chamber is connected to the oil mist filter and to the vacuum generator; the pumping sampling device is connected to the natural gas measuring chamber; the central controller is connected to the oil mist measuring chamber, the natural gas measuring chamber and the air extraction sampling device, and is used for controlling the opening of the air extraction sampling device and judging whether the central controller is located in a combustible gas concentration dangerous area or not according to an oil mist concentration value measured by the oil mist measuring chamber, a natural gas concentration value measured by the natural gas measuring chamber and a mixing ratio of oil mist and natural gas.
In a further development of the invention, the suction sampling device is a vacuum generator.
The vacuum generator adopts compressed air as a power source, and the air extraction sampling device is communicated with the compressed air through a pressure stabilizing valve.
A further development of the invention provides that the oil mist measuring chamber is provided in a plurality, each oil mist measuring chamber being in communication with the crankcase of one of the engines.
A further development of the invention is that a distribution block is provided in the central control unit, one end of the distribution block communicating with one of the oil mist filters and the other end of the distribution block communicating with a plurality of the oil mist measurement chambers.
The invention further improves that the central controller comprises an input unit, a storage unit and a comparison unit; the input unit is connected with the oil mist measuring chamber and the natural gas measuring chamber and is used for acquiring an oil mist concentration value measured by the oil mist measuring chamber and a natural gas concentration value measured by the natural gas measuring chamber in real time; the storage unit stores an oil mist explosion range threshold value, a natural gas explosion range threshold value and a mixing ratio explosion range threshold value of oil mist and natural gas; the comparison unit is connected with the input unit and the storage unit and is used for comparing whether the oil mist concentration value measured by the oil mist measuring chamber is within the oil mist explosion range threshold value or not; the natural gas concentration value is used for comparing whether the natural gas concentration value measured by the natural gas measuring chamber is within the natural gas explosion range threshold value or not; and the system is used for comparing whether the mixing ratio of the oil mist and the natural gas is within the explosion range threshold of the mixing ratio of the oil mist and the natural gas.
The application also provides a safety explosion-proof detection system, which comprises an engine and the safety explosion-proof detection device; the engine comprises a crankcase, and the oil mist measuring chamber is mounted on the crankcase of the engine and is communicated with the crankcase; the safety explosion-proof detection device is used for measuring the oil mist concentration value of the crankcase through the oil mist measuring chamber and measuring the natural gas concentration value through the natural gas measuring chamber.
The invention provides a safe explosion-proof detection device and a safe explosion-proof detection system, which are applied to a marine dual-fuel engine or two engine sets with different fuels, can monitor the concentration of oil mist and gas mixture gas in a crankcase of the marine engine, can effectively reduce the explosion danger of a large-scale ship in the operation process, can independently detect the concentration of the oil mist and the gas mixture in the crankcase of each engine and the concentration of natural gas on the one hand, and can also simultaneously detect the mixture ratio of the oil mist concentration and the natural gas concentration in different concentration ranges, and directly judge whether the explosion danger exists according to the gas mixture ratio, so that the explosion-proof reaction speed is higher than that of the traditional natural dispersion sampling, and the operation safety of the ship of the safe explosion-proof detection system can be better ensured after the safe explosion-proof detection device and the safe explosion-proof detection system are put into use.
Drawings
Fig. 1 is a schematic structural diagram of the safety explosion-proof detection device.
Fig. 2 is a schematic structural diagram of the safety explosion-proof detection system.
Fig. 3 is a schematic diagram of the safety explosion-proof detection device of the present application.
Fig. 4 is a schematic structural diagram of the central controller of the present application.
Description of reference numerals:
a pressure stabilizing valve 1, an air extraction sampling device 2, an oil mist measuring chamber 3,
an oil mist filter 4, a natural gas measuring chamber 5, a central controller 6,
the safety explosion-proof detecting device 10, the engine 20, the crankcase 21,
an alarm indicator lamp 30, a first alarm unit 31, a second alarm unit 32,
a third alarm unit 33, a host control system 40, an input unit 61,
a storage unit 62, a comparison unit 63, an output unit 64,
a safety explosion-proof detection system 100.
Detailed Description
The preferred embodiments of the present invention will be fully described below with reference to the accompanying drawings, so that the technical contents thereof will be more clearly understood. The present invention may be embodied in many different forms of embodiments and its scope is not limited to the embodiments set forth herein.
Referring to fig. 1, the safety explosion-proof detection device 10 provided by the invention is applied to a ship with a safety explosion-proof detection system, is used as an oil mist and gas mixing detection device of a dual-fuel engine, and mainly comprises a pressure stabilizing valve 1, an air extraction sampling device 2, an oil mist measuring chamber 3, an oil mist filter 4, a natural gas measuring chamber 5, a central controller 6 and the like, and has the advantages of simple design, high reliability, strong probe interchangeability and low manufacturing and use finished products.
The oil mist detector is different from the traditional oil mist detector and can only detect the concentration of granular oil mist, and the combustible gas detector is different from the traditional combustible gas detector and can only detect pure gaseous media, and the dual-fuel engine oil mist and gas mixed detection device can simultaneously detect oil mist and gas mixed gas and alarm according to different explosion lower limits in different mixing proportions.
Referring to fig. 1 and 2, the safety and explosion-proof detection device 10 of the present application has a high-sensitivity multi-channel parallel sampling oil mist and gas mixed detection function for a safety and explosion-proof detection system 100. Different from the existing mainstream oil mist detector and combustible gas detector which adopt a natural dispersion or electric drive air extraction sampling mode, the air extraction sampling device 2 adopts compressed air as a power source, preferably a high-power vacuum generator, and carries out air extraction sampling on the crank cases 21 of the engines 20. The air exhaust sampling device 2 adopts a Venturi tube principle, belongs to pure physical structure driving, is more suitable for an environment with a gas leakage risk, has better explosion-proof performance than the traditional electric driving sampling, and has faster reaction speed than the traditional natural dispersion sampling. In order to stabilize the pressure of the compressed air, the front end of the air extraction sampling device 2 is connected with the pressure stabilizing valve 1 and is communicated with the compressed air through the pressure stabilizing valve 1.
Specifically, the safety and explosion-proof detection system 100 comprises an engine 20 and the safety and explosion-proof detection device 10; the engine 20 includes a crankcase 21, and the oil mist measurement chamber 3 is mounted on the crankcase 21 of the engine 20 and communicates with the crankcase 21; the safety explosion-proof detection device 10 is used for measuring the oil mist concentration value of the crankcase 21 through the oil mist measuring chamber 3, and is used for measuring the natural gas concentration value in the air through the natural gas measuring chamber 5.
In the safety explosion-proof detection device 10, the oil mist measuring chamber 3 is communicated with a crankcase 21 of an engine 20 and is connected to the extracted air sampling device 2; the oil mist filter 4 is connected to the oil mist measurement chamber 3; the natural gas measuring chamber 5 is connected to the oil mist filter 4 and to the suction sampling device 2; the central controller 6 is connected to the oil mist measuring chamber 3, the natural gas measuring chamber 5 and the extracted gas sampling device 2, and the central controller 6 is configured to control the opening of the extracted gas sampling device 2 and determine whether the oil mist concentration value is in a dangerous combustible gas concentration area according to the oil mist concentration value measured by the oil mist measuring chamber 3, the natural gas concentration value measured by the natural gas measuring chamber 5 and the mixing ratio of the oil mist and the natural gas. Wherein, in fig. 1, the gas extraction sampling device 2 is located right below the central controller 6, the gas extraction sampling device 2 is connected to the natural gas measuring chamber 5 at the end position of the loop, and can detect the concentration of the natural gas in the gas exhausted by the engine 20, so that one gas extraction sampling device 2 can be used for simultaneously providing the power of the natural gas measuring chamber 5 and the negative pressure of the oil mist filter 4 to filter the oil mist and the moisture in the gas exhausted by the engine 20.
The safety explosion-proof detection system 100 includes natural gas and liquid fuel such as gasoline and diesel. As shown in fig. 3, the safety and explosion-proof detection device 10 can detect the oil mist concentration of the crankcase 21 of each engine 20 and the natural gas concentration, and can detect the mixture ratio of the oil mist concentration and the natural gas concentration in different concentration ranges, and determine whether there is an explosion hazard directly through the gas mixture ratio, so that the explosion-proof reaction speed is faster than that of the conventional natural dispersion sampling, and the operation safety of the ship of the safety and explosion-proof detection system 100 can be better guaranteed after the safety and explosion-proof detection device is put into use.
As shown in fig. 3, the principle of the safety explosion-proof detection device 10 is specifically as follows: on one hand, the air source is adopted as the compressed air as the power source through the air extraction sampling device 2, and the pressure stabilizing valve 1 is communicated with the air source to provide the compressed air after pressure stabilization. The air extraction sampling device 2 adopts a Venturi tube principle, belongs to pure physical structure driving, is more suitable for an environment with gas leakage risk, has better explosion-proof performance than the traditional electric driving sampling, and has faster reaction speed than the traditional natural dispersion sampling; the extraction sampling device 2 is communicated to the natural gas measuring chamber 5 to generate negative pressure adsorption air for the natural gas measuring chamber 5, and the natural gas measuring chamber 5 is used as a natural gas sensor to detect a natural gas concentration value in the air; the central controller 6 is connected to the natural gas measuring chamber 5 and the gas extraction sampling device 2 at the same time, and gives an alarm when the concentration value of the natural gas is within the threshold value of the natural gas explosion range. On the other hand, the oil mist measurement chamber 3 is mounted in communication with a crankcase 21 of the engine 20, and the oil mist measurement chamber 3 serves as an oil mist sensor for measuring an oil mist concentration value in the crankcase 21; the central controller 6 is electrically connected and communicated with the plurality of oil mist measuring chambers 3 at the same time, and gives an alarm when the oil mist concentration value in any one of the oil mist measuring chambers 3 is within the oil mist explosion range threshold value. On the other hand, the central controller 6 detects the natural gas concentration value and the oil mist concentration value at the same time, and also gives an alarm when the mixing ratio of the oil mist and the natural gas is within the explosion range threshold of the mixing ratio of the oil mist and the natural gas.
In this embodiment, the oil mist measuring chamber 3 is provided in plural, and each oil mist measuring chamber 3 is communicated with the crankcase 21 of one of the engines 20. A distribution block (not shown) is integrated in the central controller 6, and the distribution block is a one-to-many adapter structure, one end of the distribution block is communicated with one oil mist filter 4, and the other end of the distribution block is communicated with a plurality of oil mist measurement chambers 3. This makes it possible to filter oil mist and moisture from a plurality of oil mist measuring chambers 3 simultaneously by one oil mist filter 4. Preferably, one oil mist filter 4 is in simultaneous communication with ten or less oil mist measurement chambers 3. After passing through the oil mist measuring chamber 3, the sampled gas is converged into a distribution block, and then the sampled gas enters a natural gas measuring chamber 5 after oil mist and water vapor are filtered out by a filter; the natural gas measuring chamber 5 measures the concentration of natural gas in the sampled gas, converts the concentration value of the natural gas into an electric signal and transmits the electric signal to the central control unit, and the central controller 6 obtains the concentration values of oil mist and natural gas of the sampled gas and then controls the range of the values through calculation.
In more detail, as shown in fig. 4, the central controller 6 includes an input unit 61, a storage unit 62, a comparison unit 63, and an output unit 64; the input unit 61 is connected to the oil mist measuring chamber 3 and the natural gas measuring chamber 5, and is configured to obtain an oil mist concentration value measured by the oil mist measuring chamber 3 and a natural gas concentration value measured by the natural gas measuring chamber 5 in real time; the storage unit 62 stores an oil mist explosion range threshold value, a natural gas explosion range threshold value and a mixing ratio explosion range threshold value of oil mist and natural gas; the comparing unit 63 is connected to the input unit 61 and the storage unit 62, and is configured to compare whether the oil mist concentration value measured by the oil mist measuring chamber 3 is within the oil mist explosion range threshold value; and is used for comparing whether the natural gas concentration value measured by the natural gas measuring chamber 5 is within the natural gas explosion range threshold value; and for comparing whether the mixing ratio of oil mist and natural gas is within an explosive range threshold of the mixing ratio of oil mist and natural gas; the output unit 64 is connected with the comparison unit 63; when the oil mist concentration value measured by the oil mist measuring chamber 3 is within the oil mist explosion range threshold value, the output unit 64 outputs a first alarm signal; when the natural gas concentration value measured by the natural gas measuring chamber 5 is within the natural gas explosion range threshold value, the output unit 64 outputs a second alarm signal; when the mixing ratio of the oil mist and the natural gas is within the explosion range threshold value of the mixing ratio of the oil mist and the natural gas, the output unit 64 outputs a third alarm signal.
As shown in fig. 2, the safety explosion-proof detection system 100 further comprises an alarm indicator lamp 30, wherein the alarm indicator lamp 30 is connected to the central controller 6; when the central controller 6 determines that the oil mist concentration value, the natural gas concentration value and the mixing ratio of the oil mist and the natural gas are in a dangerous combustible gas concentration area, the central controller 6 outputs an alarm signal to the alarm indicator lamp 30 to perform pre-alarm or main alarm.
As shown in fig. 2, the alarm indicator lamp 30 includes a first alarm unit 31, a second alarm unit 32, and a third alarm unit 33; when the central controller 6 determines that the oil mist concentration value measured by the oil mist measuring chamber 3 is within the oil mist explosion range threshold value, a first alarm signal is output to the alarm indicator lamp 30, and a first alarm unit 31 of the alarm indicator lamp 30 is turned on; when the central controller 6 determines that the natural gas concentration value measured by the natural gas measuring chamber 5 is within the natural gas explosion range threshold value, a second alarm signal is output to the alarm indicator lamp 30, and a second alarm unit 32 of the alarm indicator lamp 30 is turned on; when the central controller 6 determines that the mixing ratio of the oil mist to the natural gas is within the explosion range threshold of the mixing ratio of the oil mist to the natural gas, a third alarm signal is output to the alarm indicator lamp 30, and the third alarm unit 33 of the alarm indicator lamp 30 is turned on.
As shown in fig. 2, the safety explosion-proof detection system 100 further comprises a host control system 40, and the alarm indicator lamp 30 is connected to the host control system 40; when the central controller outputs a first alarm signal to the first alarm unit 31 of the alarm indicator lamp 30 for pre-alarming, the host control system 40 controls the engine 20 to decelerate; when the central controller outputs a second alarm signal to the second alarm unit 32 of the alarm indicator lamp 30 for pre-alarming, the host control system 40 controls the engine 20 to decelerate; when the central controller outputs a third alarm signal to the third alarm unit 33 of the alarm indicator lamp 30 for a main alarm, the main engine control system 40 controls the engine 20 to stop.
The invention provides a safe explosion-proof detection device and a safe explosion-proof detection system, which are applied to a marine dual-fuel engine or two engine sets with different fuels, can monitor and alarm the concentration of oil mist and gas mixture gas in a crankcase of the marine engine, can effectively reduce the explosion danger of a large-sized ship in the operation process, can independently detect the concentration of the oil mist and the concentration of natural gas in the crankcase of each engine and also can simultaneously detect the mixing ratio of the concentration of the oil mist and the concentration of the natural gas in different concentration ranges, and directly judge whether the explosion danger exists according to the gas mixing ratio, so that the explosion-proof reaction speed is higher than that of the traditional natural dispersion sampling, and the operation safety of the ship of the safe explosion-proof detection system can be better ensured after the safe explosion-proof detection device is put into application.
The above description is only a preferred embodiment of the present invention to make it clear for those skilled in the art how to practice the present invention, and these embodiments do not limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the principles of the invention, and such modifications and enhancements are intended to be included within the scope of the invention.
Claims (7)
1. A safety explosion-proof detection device, comprising:
the oil mist measuring chamber is communicated with a crankcase of the engine;
an oil mist filter connected to the oil mist measurement chamber;
a natural gas measurement chamber connected to the oil mist filter;
the pumping sampling device is connected to the natural gas measuring chamber; and
and the central controller is connected to the oil mist measuring chamber, the natural gas measuring chamber and the air extraction sampling device, and is used for controlling the opening of the air extraction sampling device and judging whether the central controller is positioned in a combustible gas concentration dangerous area or not according to the oil mist concentration value measured by the oil mist measuring chamber, the natural gas concentration value measured by the natural gas measuring chamber and the mixing ratio of the oil mist and the natural gas.
2. A safety explosion proof detection device according to claim 1 wherein said suction sampling means is a vacuum generator.
3. A safety explosion-proof detection device as claimed in claim 2 wherein said vacuum generator uses compressed air as a power source and said suction sampling means is in communication with the compressed air through a pressure maintaining valve.
4. A safety explosion proof detection device according to claim 1 wherein a plurality of said oil mist measuring chambers are provided, each of said oil mist measuring chambers being in communication with a crankcase of one of said engines.
5. The safety explosion protection probe device of claim 4, further comprising:
a distribution block having one end communicating with one of the oil mist filters and the other end communicating with the plurality of oil mist measurement chambers.
6. A safety explosion-proof detection device as set forth in claim 1, wherein said central controller includes:
the input unit is connected with the oil mist measuring chamber and the natural gas measuring chamber and is used for acquiring an oil mist concentration value measured by the oil mist measuring chamber and a natural gas concentration value measured by the natural gas measuring chamber in real time;
the storage unit is used for storing an oil mist explosion range threshold value, a natural gas explosion range threshold value and a mixing ratio explosion range threshold value of oil mist and natural gas;
the comparison unit is connected with the input unit and the storage unit and is used for comparing whether the oil mist concentration value measured by the oil mist measuring chamber is within the oil mist explosion range threshold value or not; and the natural gas concentration value is used for comparing whether the natural gas concentration value measured by the natural gas measuring chamber is within the natural gas explosion range threshold value; and comparing whether the mixing ratio of the oil mist and the natural gas is within an explosion range threshold value of the mixing ratio of the oil mist and the natural gas.
7. A safety explosion-proof detection system comprising an engine and the safety explosion-proof detection apparatus of claim 1; the engine comprises a crankcase, and the oil mist measuring chamber is mounted on the crankcase of the engine and is communicated with the crankcase; the safety explosion-proof detection device is used for measuring the oil mist concentration value of the crankcase through the oil mist measuring chamber and measuring the natural gas concentration value through the natural gas measuring chamber.
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| CN113281111B true CN113281111B (en) | 2022-09-23 |
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| JPS61111451A (en) * | 1984-11-05 | 1986-05-29 | Toyota Central Res & Dev Lab Inc | Oil mist detection device |
| US7509798B2 (en) * | 2004-10-27 | 2009-03-31 | Maganas Thomas C | Methods and systems for safely operating a diesel engine in a methane-rich environment |
| CN201428532Y (en) * | 2009-05-31 | 2010-03-24 | 徐扬 | Oil-saving device |
| JP2017506717A (en) * | 2014-02-21 | 2017-03-09 | ボルボトラックコーポレーション | Method for removing leaked crankcase fluid from crankcase and crankcase ventilation system |
| CN205246514U (en) * | 2015-12-23 | 2016-05-18 | 中国船舶重工集团公司第七一一研究所 | Distributing type diesel engine crankcase oil mist concentration monitoring alarm device |
| US10995683B2 (en) * | 2018-04-30 | 2021-05-04 | Woodward, Inc. | Acoustic knock detection in dual-fuel engines |
| CN111721679A (en) * | 2019-03-21 | 2020-09-29 | 中国船舶重工集团公司第七一一研究所 | Multi-channel oil mist concentration detection device for diesel engine |
| CN215005369U (en) * | 2021-05-20 | 2021-12-03 | 中国船舶重工集团公司第七一一研究所 | Safe explosion-proof detection device and system |
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