CN111774384A - Gas pipeline lubricating oil pumping method - Google Patents
Gas pipeline lubricating oil pumping method Download PDFInfo
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- CN111774384A CN111774384A CN202010666026.5A CN202010666026A CN111774384A CN 111774384 A CN111774384 A CN 111774384A CN 202010666026 A CN202010666026 A CN 202010666026A CN 111774384 A CN111774384 A CN 111774384A
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- lubricating oil
- oil
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/032—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing
- B08B9/035—Cleaning the internal surfaces; Removal of blockages by the mechanical action of a moving fluid, e.g. by flushing by suction
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
- B08B9/027—Cleaning the internal surfaces; Removal of blockages
- B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Pipeline Systems (AREA)
Abstract
The invention relates to the field of pipeline maintenance, in particular to a lubricating oil pumping method for a gas transmission pipeline, which comprises the following steps: s1: the lubricating oil position detection module monitors a lubricating oil deposition signal in the pipeline in real time and determines a lubricating oil deposition position; s2: the lubricating oil pumping module sends a lubricating oil deposition signal to the control terminal system, the control terminal system sends an oil absorption signal to the lubricating oil pumping module, and the electro-hydraulic control system sucks out the lubricating oil; s3: and (5) completely sucking the lubricating oil, closing the electromagnetic valve and finishing oil suction. Compared with the prior art, the method has the following advantages: a method for removing oil retained in a gas pipeline is provided; the automation degree is high, and the efficiency is high; and by adopting the pipeline robot technology, the safety is improved, and the leakage risk is reduced.
Description
Technical Field
The invention relates to the field of pipeline maintenance, in particular to a lubricating oil pumping method for a gas pipeline.
Background
In recent years, in order to meet the requirements, the scale of oil and gas pipe networks in China is continuously enlarged, and the construction and management level of the pipelines is greatly improved. According to the medium-long term oil and gas pipe network planning, the scale of the national long-distance oil and gas pipe network reaches 16.9 km by 2020; by 2025, the scale of a pipe network reaches 24 km, and by 2017, the total mileage of a Chinese oil and gas long-distance pipeline reaches 13.14 km, wherein the total mileage of the natural gas pipeline is about 7.26 km, the total mileage of the crude oil pipeline is about 3.09 km, and the total mileage of a finished oil pipeline is about 2.79 km.
The oil and gas pipe network is a main artery for energy transmission, and has wide application in the aspect of energy strategic layout in China. However, with the increase of the operation time of the pipeline, the pipeline has the problems of corrosion, defects and the like, and the pipeline needs to be detected, evaluated and maintained in time, so that casualties and property loss caused by the breakage of the pipeline are avoided.
The long-distance transmission of natural gas requires pressurization, and a common pressurization device comprises a reciprocating compressor (hereinafter referred to as a compressor) which is lubricated by oil, wherein a part of lubricating oil injected into the compressor enters a scrubbing tank at the inlet of the compressor along with the compressed natural gas through a return pipeline in a compressor skid; one part enters the sump oil collecting tank through the piston rod air seal; the remaining oil then enters the downstream pipeline with the compressed natural gas, up to the sea pipe. The lubricating oil can be condensed and retained in a gas transmission pipeline along with the natural gas transportation process, and a large amount of retained lubricating oil can increase the resistance of the natural gas and seriously affect the safety of natural transportation.
It is necessary to remove the retained lubricating oil to reduce the natural gas conveying resistance, improve the natural gas conveying efficiency and finally ensure the natural gas conveying safety.
The invention patent (application number: CN201610111812.2) discloses a multifunctional liquid accumulation control valve, which generates vortex motion when airflow passes through a vortex flow generator, and improves the liquid carrying capacity of the gas. However, the invention does not fundamentally remove accumulated liquid, and gas carrying liquid is very likely to be accumulated in the next low-lying part; when the device is applied to a long-distance pipeline, the vortex flow pipe needs to be manually converted, so that the efficiency is low; the swirling motion of the device can only drive water mixed in natural gas.
The invention patent (application number: CN201510386095.X) discloses a method for removing accumulated liquid in a low-lying position of a pipeline and monitoring a corrosion inhibitor on line. However, the invention adopts a gas lift mode to remove the accumulated liquid, when the liquid level in the accumulated liquid buffer tank is lower than the air flow nozzle, the liquid is not removed, and the gas rises to easily cause leakage and pollute the environment.
The utility model patent (application number: CN201920883923.4) discloses a device for removing accumulated liquid in a long-distance natural gas pipeline. The device is arranged between pipelines, and the gas inlet and the gas outlet are connected with a natural gas pipeline, so that accumulated liquid is accumulated at the lower part of the liquid discharge pipe. The device can only solve the problem of liquid accumulation of a small section of the long-distance pipeline, the integrity of the pipeline is damaged, and leakage and environmental pollution are more easily caused.
Disclosure of Invention
In order to solve the problem that the prior art is difficult to be suitable for lubricating oil suction, the invention provides a lubricating oil suction method for a gas transmission pipeline.
In order to achieve the above purpose, the present invention is realized by the following scheme:
a method for pumping lubricating oil in a gas pipeline is characterized by comprising the following steps: s1: the lubricating oil position detection module monitors a lubricating oil deposition signal in the pipeline in real time and determines a lubricating oil deposition position; s2: the lubricating oil pumping module sends a lubricating oil deposition signal to the control terminal system, the control terminal system sends an oil absorption signal to the lubricating oil pumping module, and the electro-hydraulic control system sucks out the lubricating oil; s3: and (5) completely sucking the lubricating oil, closing the electromagnetic valve and finishing oil suction.
Further, the step of determining the deposition position of the lubricating oil is as follows: s11: the lubricating oil position detection module calculates the liquid level height; s12: and when the height of the liquid level of the lubricating oil is greater than the calibrated height, the industrial CCD camera takes a picture of the gas transmission pipeline, and secondary correction is carried out on the deposition position of the lubricating oil by using the picture so as to determine that the lubricating oil deposition really exists at the target position.
Further, the step S2 specifically includes the following steps: s21: when the oil deposit exists, the oil pumping module encodes the information and sends the information to the control terminal system; s22: the data processing center of the control terminal system processes the information and then sends an oil absorption signal to the lubricating oil pumping module through the signal transceiver; s23: an electro-hydraulic control system in the lubricating oil suction module controls the power-off normally closed electromagnetic switch valve and the two-position three-way electromagnetic valve to suck out lubricating oil.
Further, in the step S3, the liquid level sensor collects the liquid level of the lubricant in real time before the lubricant is completely sucked out, and transmits the liquid level data to the DSP, and when the liquid level is lower than the set value, the electromagnetic valve is closed, and the oil suction is finished.
Further, the gravity accelerometer a detects an included angle between the oil suction port and the gravity acceleration direction in real time during the process of sucking out the lubricating oil in step S2, and if the included angle between the oil suction port and the gravity acceleration direction is greater than 10 °, the stepping motor B is started to rotate the lubricating oil suction port to the gravity acceleration direction in real time and then suck the oil.
Further, the process of sucking out the lubricating oil can be realized by the following steps: 6-10 oil suction openings are uniformly arranged in the circumferential direction, each oil suction opening is provided with an electromagnetic switch valve, the gravity accelerometer A detects which oil suction opening has the smallest included angle with the gravity acceleration direction in real time, and the corresponding electromagnetic switch valve is opened to suck oil.
Further, in the step S2, the pressure sensor monitors the pressure inside the pipeline in real time, and calculates whether the pressure inside the pipeline can suck out the lubricant oil, if so, opens the power-off normally closed electromagnetic switch valve to energize the two-position three-way electromagnetic valve, and the lubricant oil is sucked out by using the pressure inside the pipeline, and if the pressure inside the pipeline cannot suck out the lubricant oil, the two-position three-way electromagnetic valve is powered off, and the booster pump is started to discharge the lubricant oil by secondary pressurization.
Further, the parameters of the suction pressure and the suction power are set according to the viscosity, the density, the deposition distance and the size of the suction oil pipe.
Compared with the prior art, the invention has the advantages that:
(1) a method is provided for removing oil retained in a gas pipeline.
(2) The automation degree is high, and the efficiency is higher.
(3) And by adopting the pipeline robot technology, the safety is improved, and the leakage risk is reduced.
Drawings
FIG. 1 is a schematic structural view of the pipeline robot of the present invention;
FIG. 2 is a schematic diagram of the system components of the control terminal according to the present invention;
FIG. 3 is a schematic view of an oil pumping module of the present invention;
FIG. 4 is a schematic view of an oil position detection module according to the present invention;
fig. 5 is a schematic view of the oil suction port of the present invention.
Fig. 6 is a second schematic view of the oil suction port structure of the present invention.
FIG. 7 is a flow chart of the present invention for pumping oil.
FIG. 8 is a flow chart of the present invention for determining the location of oil deposits.
In the figure: the system comprises a lubricating oil position detection module 1, a lubricating oil suction module 2, an electro-hydraulic control system 3, a data acquisition and processing system 4, an oil suction port 5, a pipeline robot 6, a control terminal system 7, a memory (A)8, a gravity accelerometer (A)9, a two-position three-way electromagnetic valve 10, a booster pump 11, a one-way valve (A)12, a one-way valve (B)13, a one-way valve (C)14, an umbilical cable 15, a lubricating oil collection device 16, a pipeline 17, an overflow valve 18, an oil suction port system 19, a power-off normally-closed electromagnetic switch valve 20, a pressure sensor 21, a liquid level sensor 22, a power supply module 23, an industrial CCD camera 24, a memory (B)25, a stepping motor (A)26, an ultrasonic liquid level detection sensor 27, a gravity accelerometer (B)28, a one-way valve (D)29, a stepping motor (B) 30.
Detailed Description
In order to clearly understand the technical features and the effects of the present invention, embodiments of the present invention will be described with reference to the accompanying drawings.
The embodiment provides a gas pipeline lubricating oil pumping system which comprises a pipeline robot 6 and a control terminal system 7. As shown in fig. 1, the pipeline robot 6 is provided with a lubricating oil position detection module 1, a lubricating oil suction module 2, an electro-hydraulic control system 3, a data acquisition and processing system 4 and an oil suction port 5; the pipeline robot 6 is used for crawling and is used as a carrier for lubricating oil suction; the total number of the oil suction openings 5 is 6-10, and the oil suction openings are uniformly distributed in the circumferential direction.
As shown in fig. 2, the control terminal system includes a data processing center, a signal transceiver, an input device, a storage unit, and a display module; the signal receiving and transmitting device, the input equipment, the storage unit and the display module are respectively connected with the data processing center, each part is controlled by the control module of the data processing center, and the display module can display the three-dimensional track position coordinates of the pipeline robot in real time.
As shown in fig. 3, the lubricating oil pumping module 2 comprises an electro-hydraulic control system 3 and a data acquisition and processing system 4, wherein the electro-hydraulic control system 3 is composed of a two-position three-way solenoid valve 10, a booster pump 11, a check valve (a)12, a check valve (B)13, a check valve (C)14, a lubricating oil collecting device 16, an overflow valve 18 and a power-off normally closed solenoid switch valve 20; the power-off normally closed electromagnetic switch valve 20 and the two-position three-way electromagnetic valve 10 are independently controlled by a DSP respectively, the power-off normally closed electromagnetic switch valve 20 is connected with the two-position three-way electromagnetic valve 10 in series, two outlets of the two-position three-way electromagnetic valve 10 are connected with a one-way valve (A)12 and a booster pump 11 respectively, the booster pump 11 is connected with a one-way valve (B)13 in series, an overflow valve 18, the one-way valve (A)12 and the one-way valve (B)13 are connected in parallel, the overflow valve 18, the one-way valve (A)12 and the one-way valve (B)13 are connected with a one-way valve. The data acquisition and processing system is composed of a liquid level sensor 22, a pressure sensor 21, a gravity accelerometer (A)9, a memory (A)8, an AD and an AD/DA, wherein the liquid level sensor 22 detects the height of the liquid level of lubricating oil, the pressure sensor 21 detects the pressure in a pipe, and the gravity accelerometer (A)9 detects the gravity direction.
As shown in fig. 4, the lubricating oil position detecting module 1 is composed of a power supply module 23, an industrial CCD camera 24, a memory (B)25, a stepping motor (a)26, an ultrasonic liquid level detecting sensor 27, and a gravity accelerometer (B) 28; the stepping motor (A)26, the ultrasonic liquid level detection sensor 27 and the gravity accelerometer (B)28 are independently controlled by the DSP.
As shown in fig. 5, the oil suction opening 5 and the normally closed electromagnetic switch valve 20 are connected in series only by the one-way valve (D)29 in one-way conduction, the stepping motor (B)30 is arranged outside the oil suction opening 5, and the stepping motor (B)30 rotates the oil suction opening 5 to realize the suction of the lubricant from different oil suction openings 5
As shown in fig. 6, a one-way valve (D)29 and an electromagnetic switch valve 31 are connected in series between the oil suction opening 5 and the power-off normally closed electromagnetic switch valve 20, the electromagnetic switch valve 31 can be independently controlled, and the selection of different oil suction openings 5 for sucking the lubricating oil can be realized by switching on and off the electromagnetic switch valve 31.
As shown in fig. 7 and 8, the working process of the oil pumping system for the gas transmission pipeline comprises the following steps: s1: the lubricating oil position detection module 1 monitors a lubricating oil deposition signal in the pipeline 17 in real time and determines a lubricating oil deposition position; s2: the lubricating oil pumping module 2 sends a lubricating oil deposition signal to the control terminal system 7, the control terminal system 7 sends an oil absorption signal to the lubricating oil pumping module 2, and the electro-hydraulic control system 3 sucks out the lubricating oil; s3: and (5) completely sucking the lubricating oil, closing the electromagnetic valve and finishing oil suction. The step of determining the deposition position of the lubricating oil comprises the following steps: s11: the lubricating oil position detection module 1 calculates the liquid level height; s12: when the height of the liquid level of the lubricating oil is greater than the calibrated height, the industrial CCD camera 24 photographs the gas transmission pipeline, and the position of the deposition of the lubricating oil is secondarily corrected by using the photograph so as to determine that the deposition of the lubricating oil does exist at the target. The step S2 specifically includes the following steps: s21: when there is oil deposit, the oil pumping module 2 encodes the information and sends it to the control terminal system 7; s22: the data processing center of the control terminal system 7 processes the information and then sends an oil absorption signal to the lubricating oil pumping module 2 through the signal transceiver; s23: an electro-hydraulic control system 3 in the lubricating oil pumping module 2 controls the power-off normally closed electromagnetic switch valve 20 and the two-position three-way electromagnetic valve 10 to pump out lubricating oil. In step S3, the liquid level sensor 22 collects the liquid level of the lubricant in real time before the lubricant is completely sucked out, and transmits the liquid level data to the DSP, and when the liquid level is lower than the set value, the electromagnetic valve is closed to end the oil suction. In the step S2, the gravity accelerometer (a)9 detects an angle between the oil suction port 5 and the gravity acceleration direction in real time during the process of sucking out the lubricating oil, and if the angle between the oil suction port 5 and the gravity acceleration direction is greater than 10 °, the stepping motor (B)30 is started to rotate the lubricating oil suction port 5 to the gravity acceleration direction in real time and then suck the lubricating oil. The process of sucking out the lubricant in step S2 may be further implemented by: 6-10 oil suction ports 5 are uniformly arranged in the circumferential direction, each oil suction port 5 is provided with an electromagnetic switch valve 31, a gravity accelerometer A9 detects which oil suction port 5 has the smallest included angle with the gravity acceleration direction in real time, and the corresponding electromagnetic switch valve 31 is opened to suck oil. In the step S2, the pressure sensor 21 monitors the internal pressure of the pipeline 17 in real time, and obtains whether the pressure in the pipeline can suck out the lubricant oil through calculation, if the pressure can suck out the lubricant oil, the power-off normally closed electromagnetic switch valve 20 is opened, the two-position three-way electromagnetic valve 10 is powered on, the lubricant oil is sucked out by using the pressure in the pipeline, if the pressure in the pipeline 17 cannot suck out the lubricant oil, the two-position three-way electromagnetic valve 10 is powered off, the booster pump 11 is started, and the lubricant oil is discharged by secondary pressurization.
As shown in fig. 1-8, the working principle of the oil pumping system for the gas pipeline is as follows: the fuselage of pipeline robot 6 is the carrier of each system of pipeline robot 6, provides interface and mounted position for each system that sets up on the fuselage, and the action of pipeline robot 6 relies on braced system and telescopic machanism to realize, and the alternative action through braced mechanism and telescopic machanism in the braced system realizes advancing or retreating of pipeline robot 6. Controlling input equipment in the terminal system 7 to input traction speed and traction force according to the three-dimensional track of the gas transmission pipeline; and setting parameters of suction pressure and suction power according to the viscosity, density, deposition distance and size of the suction oil pipe. The data processing center encodes the traction speed and the traction force and transmits the data to the pipeline robot 6 in the pipeline through the signal receiving and transmitting device, and the pipeline robot 6 decodes the control signal and controls the proportional reversing valve of the supporting system to reverse according to a certain sequence, so that the action of the pipeline robot 6 is realized. When the pipeline robot 6 moves forward, the gravity accelerometer (B)28 in the lubricating oil position detection module 1 detects an included angle between the oil suction port 5 and the gravity acceleration direction in real time, and if the included angle between the oil suction port 5 and the gravity acceleration direction is larger than 10 degrees, the stepping motor (a)26 is started to rotate the lubricating oil suction port 5 to the gravity acceleration direction in real time. After the lubricating oil deposition exists, the lubricating oil pumping module 2 codes the information and sends the information to the control terminal system 7, the control terminal system 7 decodes the received information and displays the decoded information on the display module, the control terminal system 7 can select to stop the pipeline robot 6 to absorb oil or enable the pipeline robot 6 to continue to move forwards, and after the user selects to stop the pipeline robot 6 to absorb oil, the data processing center performs oil absorption information coding on the pipeline robot 6 and transmits the data to the lubricating oil pumping module 2 through the signal receiving and transmitting device. The pressure sensor 21 monitors the internal pressure of the pipeline 17 in real time, whether the pressure in the pipeline can suck out the lubricating oil or not is obtained through calculation, if the pressure can suck out the lubricating oil, the power-off normally closed electromagnetic switch valve 20 is opened, the two-position three-way electromagnetic valve 10 is powered on, the lubricating oil is sucked out by utilizing the pressure in the pipeline, if the pressure in the pipeline 17 cannot suck out the lubricating oil, the two-position three-way electromagnetic valve 10 is powered off, the booster pump 11 is started, and the lubricating oil is discharged through secondary. And (3) the liquid level sensor 22 collects the liquid level of the lubricating oil in real time before the lubricating oil is completely sucked out, the liquid level data is transmitted to the DSP, and when the height of the liquid level is lower than a set value, the electromagnetic valve is closed to finish oil suction.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the scope of the invention.
Claims (7)
1. A method for pumping lubricating oil in a gas pipeline is characterized by comprising the following steps:
s1: the lubricating oil position detection module (1) monitors a lubricating oil deposition signal inside the pipeline (17) in real time and determines a lubricating oil deposition position;
s2: the lubricating oil pumping module (2) sends a lubricating oil deposition signal to the control terminal system (7), the control terminal system (7) sends an oil absorption signal to the lubricating oil pumping module (2), and the electro-hydraulic control system (3) sucks out the lubricating oil;
s3: and (5) completely sucking the lubricating oil, closing the electromagnetic valve and finishing oil suction.
2. The method for pumping lubricating oil in a gas pipeline according to claim 1, wherein the method comprises the following steps: the step of determining the deposition position of the lubricating oil comprises the following steps:
s11: the lubricating oil position detection module (1) calculates the liquid level height;
s12: when the height of the liquid level of the lubricating oil is larger than the calibrated height, the industrial CCD camera (24) photographs the gas transmission pipeline, and secondary correction is carried out on the deposition position of the lubricating oil by using the photograph so as to determine that the lubricating oil deposition does exist at the target position.
3. The method for pumping lubricating oil in a gas pipeline according to claim 1, wherein the method comprises the following steps: the step S2 specifically includes the following steps:
s21: when the deposition of the lubricating oil exists, the lubricating oil pumping module (2) encodes the information and sends the information to the control terminal system (7);
s22: a data processing center of the control terminal system (7) processes the information and then sends an oil absorption signal to the lubricating oil pumping module (2) through the signal transceiver;
s23: an electro-hydraulic control system (3) in the lubricating oil suction module (2) controls a power-off normally closed electromagnetic switch valve (20) and a two-position three-way electromagnetic valve (10) to suck out lubricating oil.
4. The method for pumping lubricating oil in a gas pipeline according to claim 1, wherein the method comprises the following steps: and in the step S3, the liquid level sensor (22) collects the liquid level of the lubricating oil in real time before the lubricating oil is completely sucked out, the liquid level data is transmitted to the DSP, and when the liquid level is lower than a set value, the electromagnetic valve is closed to finish oil suction.
5. The method for pumping lubricating oil in a gas pipeline according to claim 1, wherein the method comprises the following steps: in the step S2, the gravity accelerometer a (9) detects an angle between the oil suction port (5) and the gravity acceleration direction in real time during the process of sucking out the lubricating oil, and if the angle between the oil suction port and the gravity acceleration direction is larger than 10 degrees, the stepping motor B (30) is started to rotate the lubricating oil suction port (5) to the gravity acceleration direction in real time and then suck the oil.
6. The method for pumping lubricating oil in a gas pipeline according to claim 1, wherein the method comprises the following steps: the method of claim 5 may also be implemented by: the oil suction ports (5) are uniformly arranged in the circumferential direction for 6-10, each oil suction port (5) is provided with an electromagnetic switch valve (31), a gravity accelerometer A (9) detects which oil suction port (5) has the smallest included angle with the gravity acceleration direction in real time, and the corresponding electromagnetic switch valve (31) is opened to suck oil.
7. The method for pumping lubricating oil in a gas pipeline according to claim 1, wherein the method comprises the following steps: in the step S2, the pressure sensor (21) monitors the internal pressure of the pipeline (17) in real time, whether the pressure in the pipeline can suck out the lubricating oil or not is obtained through calculation, if the pressure can suck out the lubricating oil, the power-off normally closed electromagnetic switch valve (20) is opened, the two-position three-way electromagnetic valve (10) is powered on, the lubricating oil is sucked out by the pressure in the pipeline, if the pressure in the pipeline (17) cannot suck out the lubricating oil, the two-position three-way electromagnetic valve (10) is powered off, the booster pump (11) is started, and the lubricating oil is.
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| CN202010666026.5A CN111774384B (en) | 2020-07-12 | 2020-07-12 | Gas pipeline lubricating oil pumping method |
| US17/372,414 US12060973B2 (en) | 2020-07-12 | 2021-07-09 | System and method for pumping lubricant in gas pipeline |
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| CN202010666026.5A CN111774384B (en) | 2020-07-12 | 2020-07-12 | Gas pipeline lubricating oil pumping method |
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