CN214473190U - Online monitoring and alarming device for CO content in crankcase of diesel engine of offshore oil platform - Google Patents
Online monitoring and alarming device for CO content in crankcase of diesel engine of offshore oil platform Download PDFInfo
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- CN214473190U CN214473190U CN202120574182.9U CN202120574182U CN214473190U CN 214473190 U CN214473190 U CN 214473190U CN 202120574182 U CN202120574182 U CN 202120574182U CN 214473190 U CN214473190 U CN 214473190U
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Abstract
An on-line monitoring and alarm device of CO content in a diesel engine crankcase of an offshore oil platform is provided with: the air intake pipeline is provided with an electromagnetic valve, wherein the air intake pipeline is also connected with a pair of empty air intake pipelines in parallel, and the empty air intake pipelines are connected with the inlet of the air pump; when the air suction pump operates, one of the electromagnetic valves on the plurality of air inlet pipelines is opened, the other electromagnetic valves are closed, the air suction pump samples the gas of the first air cylinder, the sampled gas enters the gas buffer tank, and the CO concentration of the sampled gas is detected by the CO probe; the CO concentration is output to the PLC through the analog quantity and displayed on a display screen, and if the detection value is higher than the set alarm value, an alarm is reported on the display screen; and repeating the circulation until the detection of the plurality of cylinders is finished. The utility model can not only monitor and alarm the content of CO gas in the crankcase on line; and moreover, the serious equipment damage caused by the air blowby of the air cylinder is avoided.
Description
Technical Field
The utility model belongs to the offshore oil engineering field especially relates to online monitoring and alarm device of CO content in the marine oil platform diesel engine crankcase.
Background
At present, on an offshore oil and gas production platform, a diesel (crude oil) unit network is used for generating more electricity. Due to the high requirement on the stability of the power grid, the requirement on the operation stability of the diesel engine set for networking power generation is also high. And because the diesel oil (crude oil) unit on the offshore oil and gas production platform has longer continuous operation time, the cylinder air leakage phenomenon caused by the problems of piston abrasion, cylinder sleeve scratch, piston ring fracture and the like can occur in the operation process. However, under the condition that no monitoring means exists at present, the problems are difficult to find, the unit often damages operation, and finally, the problems of small problems and large problems can be caused, and serious equipment faults are caused; meanwhile, in the running process of the unit, the flue gas burned in the cylinder continuously enters the crankcase, and the CO gas in the cylinder is continuously gathered together, so that when the concentration of the CO gas exceeds the explosion limit value, an explosion accident can be caused.
At present, a diesel (crude oil) unit is generally detected by a CO content detection means, and the fault of air leakage of an air cylinder is judged by detecting CO gas.
The existing diesel (crude oil) unit generally comprises the following smoke components: soot Particulates (PM), Hydrocarbons (HC), CO, and NOx, among others. In a normal state of the unit, only oil mist steam is generally present in the crankcase, and the content of CO is below 5ppm, but if cylinder blow-by occurs, the content of CO in the crankcase obviously changes, and the concentration of the CO is as high as hundreds or thousands of ppm.
Aiming at the problem of air leakage of the air cylinder, because no reliable detection means exists at present, an operator can hardly find the air leakage in time, if a unit cannot find and process the air leakage of the air cylinder at the first time, the unit continues to operate with faults, the damage of equipment can be aggravated, and serious equipment faults can be caused. Therefore, the monitoring of the CO gas components in the crankcase of the diesel engine is a technical blank in the offshore oil and gas production platform at present, and needs to be filled.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an on-line monitoring and alarm device of CO content in the marine oil platform diesel engine crankcase to solve the technical problem of the on-line monitoring of CO gas content and warning in the diesel generator main engine crankcase on the marine oil platform.
In order to achieve the purpose, the utility model discloses an online monitoring and alarm device of CO content in the marine oil platform diesel engine crankcase's concrete technical scheme as follows:
an on-line monitoring and alarm device of CO content in a diesel engine crankcase of an offshore oil platform is provided with: a plurality of air inlet pipelines are respectively connected in parallel on a crankcase cover plate in the diesel engine, electromagnetic valves are respectively arranged on the air inlet pipelines, wherein,
a plurality of air inlet pipelines are also connected in parallel with one other air inlet pipeline, the air inlet pipelines are gathered into a total air inlet pipeline, and the air inlet pipeline is connected with the inlet of the air pump through the other air inlet pipeline; when the air suction pump operates, one electromagnetic valve of the electromagnetic valves on the plurality of air inlet pipelines is opened, the rest electromagnetic valves are closed, the air suction pump samples the gas of the first air cylinder, the sampled gas enters the gas cache tank through the air exhaust pipeline, and the CO concentration of the sampled gas is detected through the CO probe; and the CO concentration is output to the PLC through the analog quantity, the CO concentration is displayed on a display screen after the signal is processed, and if the detection value is higher than the set alarm value, an alarm is given on the display screen.
Further, the analog quantity is optimally in the range of 4-20 mA.
Further, the electromagnetic valve is an on-off electromagnetic valve.
Further, the crankcase cover plate is positioned at the lower part of each row of cylinders.
Further, the PLC controller is a PLC module.
Further, after the air pump finishes detecting the gas of the first cylinder, the second electromagnetic valve on the first cylinder is closed, meanwhile, the electromagnetic valve on the air inlet pipeline is opened, the fresh air extracted by the air pump sweeps the whole air inlet and outlet pipeline and the gas cache tank, the gas is discharged to a safe area through the emptying pipeline of the gas cache tank, then the electromagnetic valve on the main air inlet pipeline is closed, the third electromagnetic valve is opened, the gas of the following cylinder is continuously detected, and the steps are repeated until the detection is finished, and then the gas is recycled.
The utility model discloses an online monitoring and alarm device of CO content in marine oil platform diesel engine crankcase has following advantage:
1. the utility model can realize the full-automatic functions of on-line monitoring and alarming of CO gas content in the crankcase for medium and large diesel engines of offshore oil platforms, even diesel engines of most industrial uses; the system can monitor and alarm in real time the fault of the air blowby of the air cylinder in the running process of the diesel engine unit; and moreover, early treatment can be found out early, so that major equipment damage caused by air blowby of the air cylinder is avoided, and the monitoring blank in the aspect of large diesel engines in the existing offshore oil and gas production platform is made up.
2. The utility model can not only display the CO concentration in real time and automatically alarm after exceeding the standard, but also realize the full-automatic function without manual operation in the whole process, thereby greatly saving the manpower; meanwhile, the manual operation error is avoided, and the reliability of the device is improved.
3. The utility model has simple structure and good effect; after the device is put into use, a safety guarantee is provided for medium and large diesel engines of offshore platforms, major equipment faults caused by air leakage of cylinders can be effectively avoided, safe and stable operation of diesel engine units is guaranteed, and maintenance cost of equipment is indirectly saved.
Drawings
FIG. 1 is a schematic diagram of a diesel engine on an existing offshore oil platform;
fig. 2 is a schematic structural diagram of the present invention.
The notation in the figure is:
1. a PLC controller; 2. a display screen; 3. an air intake line; 4. an air pump; 5. a gas buffer tank; 6. an exhaust line; 7. a first solenoid valve; 8. a second solenoid valve; 9. a third electromagnetic valve; 10. a fourth solenoid valve; 11. a fifth solenoid valve; 12. a sixth electromagnetic valve; 13. a seventh electromagnetic valve; 14. an eighth solenoid valve; 15. a ninth electromagnetic valve; a1, a first cylinder; A1S, sampling pipeline interface; a8, eighth cylinder.
Detailed Description
In order to understand the utility model discloses a purpose, structure and function better, it is right to tie the figure below the utility model relates to an online monitoring and alarm device of CO content in marine oil platform diesel engine crankcase does further detailed description.
As shown in fig. 1-2, the utility model is provided with: the method comprises the following steps that a plurality of air inlet pipelines (eight in the embodiment) are connected to a crankcase cover plate in the diesel engine in a parallel connection mode respectively, and electromagnetic valves (eight in the embodiment, second electromagnetic valves 8, third electromagnetic valves 9, fourth electromagnetic valves 10, fifth electromagnetic valves 11, sixth electromagnetic valves 12, seventh electromagnetic valves 13, eighth electromagnetic valves 14 and ninth electromagnetic valves 15) are arranged on the air inlet pipelines respectively, wherein the air inlet pipelines are also connected with an empty air inlet pipeline 1 in parallel at the same time, so that the nine air inlet pipelines are combined into an overall air inlet pipeline 1, the air inlet pipelines 1 are also connected with an air inlet pipeline 3 respectively, and the air inlet pipeline 3 is connected with an inlet of an air suction pump 4; when the air pump 4 operates, a plurality of electromagnetic valves on the air inlet pipeline are opened, firstly, the second electromagnetic valve 8 is opened, the rest of the third electromagnetic valves 9-the ninth electromagnetic valves 15 are closed, the air in the first cylinder is sampled by the air pump 4, the sampled air enters the air buffer tank 5 through the exhaust pipeline 6, the CO concentration of the sampled air is detected through the CO probe and is output to the PLC through 4-20mA analog quantity, after the signal is processed, the CO concentration is displayed on the display screen 2(LED) in ppm value, and if the detection value is higher than the set alarm value, the alarm is displayed on the display screen 2.
The analog quantity is selected as follows: 2mA, 3mA, 4mA, 6mA, 8mA, 10mA, 12mA, 14mA, 16mA, 18mA, 20mA, 22mA, 24 mA; the range of 4-20mA is optimal.
After the first cylinder is detected, the second electromagnetic valve 8 on the first cylinder is closed, meanwhile, the electromagnetic valve on the air inlet pipeline 1 is opened, fresh air extracted by the air extraction pump 4 on the air inlet pipeline 3 connected with the air inlet pipeline 1 sweeps the whole air inlet and outlet pipeline and the gas cache tank 5, gas is discharged to a safe region through the emptying pipeline of the gas cache tank 5, then, the electromagnetic valve on the main air inlet pipeline 1 is closed, the third electromagnetic valve 6 is opened, gas of the second cylinder is continuously detected, and the operation is repeated, wherein the eighth cylinder is detected from the first cylinder until the detection is finished, and the operation is recycled. In the process, the switches of the first solenoid valve 7 to the ninth solenoid valve 15 are controlled by the PLC controller 1.
The electromagnetic valve is an on-off electromagnetic valve.
The crankcase cover plate is located at the lower portion of each cylinder row (eight rows in this embodiment).
The PLC controller is a PLC module.
When the device is used, the eight electromagnetic valves (namely, the second electromagnetic valve 8, the third electromagnetic valve 9, the fourth electromagnetic valve 10, the fifth electromagnetic valve 11, the sixth electromagnetic valve 12, the seventh electromagnetic valve 13, the eighth electromagnetic valve 14 and the ninth electromagnetic valve 15) in the device are respectively connected with eight cylinders (namely, the first cylinder A1-the eighth cylinder A8) in the diesel engine, and after the connection, the eight cylinders can be respectively detected one by one (when in detection, the sampling is carried out from the first cylinder A1 to the sampling pipeline interface A1S, and the like in the future); in the process, the switches of the first solenoid valve 7 to the ninth solenoid valve 15 are controlled by the PLC controller 1.
The PLC module, the display screen, the air inlet pipeline, the air suction pump, the gas cache tank and the electromagnetic valve are in the prior art, and the unexplained technology is in the prior art, so that the explanation is omitted.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes or equivalents may be substituted for elements thereof by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of the present application are intended to be covered by the present invention.
Claims (6)
1. The utility model provides an on-line monitoring and alarm device of CO content in marine oil platform diesel engine crankcase which characterized in that is equipped with: a plurality of air inlet pipelines are respectively connected in parallel on a crankcase cover plate in the diesel engine, electromagnetic valves are respectively arranged on the air inlet pipelines, wherein,
a plurality of air inlet pipelines are also connected in parallel with one other air inlet pipeline, the air inlet pipelines are gathered into a total air inlet pipeline, and the air inlet pipeline is connected with the inlet of the air pump through the other air inlet pipeline; when the air suction pump operates, one electromagnetic valve of the electromagnetic valves on the plurality of air inlet pipelines is opened, the rest electromagnetic valves are closed, the air suction pump samples the gas of the first air cylinder, the sampled gas enters the gas cache tank through the air exhaust pipeline, and the CO concentration of the sampled gas is detected through the CO probe; and the CO concentration is output to the PLC through the analog quantity, the CO concentration is displayed on a display screen after the signal is processed, and if the detection value is higher than the set alarm value, an alarm is given on the display screen.
2. The on-line monitoring and warning device of CO content in the crankcase of the offshore oil platform diesel engine according to claim 1, characterized in that the analog quantity is optimal in the range of 4-20 mA.
3. The on-line monitoring and alarming device for CO content in the crankcase of the offshore oil platform diesel engine as claimed in claim 1, wherein the electromagnetic valve is an on-off electromagnetic valve.
4. The on-line monitoring and warning device of CO content in the crankcase of the diesel engine of the offshore oil platform according to claim 1, wherein the crankcase cover plate is positioned at the lower part of each row of cylinders.
5. The on-line monitoring and warning device of CO content in the crankcase of the offshore oil platform diesel engine according to claim 1, wherein the PLC controller is a PLC module.
6. The on-line monitoring and alarming device for CO content in the crankcase of the diesel engine of the offshore oil platform as claimed in claim 1, wherein after the gas detection of the first cylinder by the air pump is completed, the second electromagnetic valve on the first cylinder is closed, meanwhile, the electromagnetic valve on the air inlet pipeline which is empty is opened, the fresh air extracted by the air pump sweeps the whole air inlet and outlet pipeline and the gas buffer tank, the gas is discharged to a safe region through the evacuation pipeline of the gas buffer tank, then, the electromagnetic valve on the main air inlet pipeline is closed, the third electromagnetic valve is opened, the gas detection of the following cylinder is continued, and the steps are repeated until the detection is completed, and then, the circulation is performed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120574182.9U CN214473190U (en) | 2021-03-22 | 2021-03-22 | Online monitoring and alarming device for CO content in crankcase of diesel engine of offshore oil platform |
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| CN202120574182.9U CN214473190U (en) | 2021-03-22 | 2021-03-22 | Online monitoring and alarming device for CO content in crankcase of diesel engine of offshore oil platform |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137153A (en) * | 2021-10-29 | 2022-03-04 | 国网河北省电力有限公司电力科学研究院 | Multi-channel gas distribution and flow distribution device for sulfur hexafluoride detection and use method thereof |
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2021
- 2021-03-22 CN CN202120574182.9U patent/CN214473190U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114137153A (en) * | 2021-10-29 | 2022-03-04 | 国网河北省电力有限公司电力科学研究院 | Multi-channel gas distribution and flow distribution device for sulfur hexafluoride detection and use method thereof |
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