CN111774384A - A kind of oil suction method of gas pipeline - Google Patents

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

A kind of oil suction method of gas pipeline

technical field

The invention relates to the field of pipeline maintenance, in particular to a lubricating oil suction method for a gas transmission pipeline.

Background technique

In recent years, in order to meet the demand, the scale of my country's oil and gas pipeline network has continued to expand, and the level of pipeline construction and management has been greatly improved. According to the "Medium and Long-Term Oil and Gas Pipeline Network Planning", the national long-distance oil and gas pipeline network scale will reach 169,000 km by 2020; by 2025, the pipeline network scale will reach 240,000 km. It has reached 131,400 km, including about 72,600 km of natural gas pipelines, about 30,900 km of crude oil pipelines, and about 27,900 km of refined oil pipelines.

Oil and gas pipeline network is the main artery of energy transmission, and it has a wide range of applications in my country's energy strategic layout. However, with the increase of pipeline operation time, pipelines have problems such as corrosion and defects, and these pipelines need to be inspected, evaluated and maintained in time to avoid casualties and property losses caused by pipeline ruptures.

The long-distance transmission of natural gas requires pressurization. Common pressurization equipment includes oil-lubricated reciprocating compressors (hereinafter referred to as compressors). Part of the lubricating oil injected into the compressor passes through the return line in the compressor skid to accompany the compressed natural gas. Enter the scrubbing tank at the inlet of the compressor; part of it enters the dirty oil collection tank through the piston rod air seal; the rest of the lubricating oil enters the downstream pipeline with the compressed natural gas to the sea pipeline. During the transportation of natural gas, lubricating oil will condense and stay in the gas pipeline. A large amount of retained lubricating oil will increase the resistance of natural gas and seriously affect the safety of natural transportation.

It is necessary to remove the retained lubricating oil to reduce the resistance of natural gas transportation, improve the efficiency of natural gas transportation, and ultimately ensure the safety of natural gas transportation.

The invention patent (application number: CN201610111812.2) discloses a multifunctional liquid accumulation control valve. When the airflow passes through the vortex flow generator, a vortex motion is generated to improve the liquid carrying capacity of the gas. However, the invention does not fundamentally remove the accumulated liquid, and the gas-carrying liquid is very likely to accumulate in the next low-lying place; when the device is applied to a long-distance pipeline, it needs to manually switch the vortex tube, which is inefficient; the vortex movement of the device only Can drive water mixed into natural gas.

The invention patent (application number: CN201510386095.X) discloses a method and method for removing liquid accumulation in low-lying areas of pipelines and online monitoring of corrosion inhibitors. However, the invention uses gas lift to remove the effusion. When the liquid level in the effusion buffer tank is lower than the airflow nozzle, the liquid will no longer be removed, and the rising of the gas will easily cause leakage and pollute the environment.

The utility model patent (application number: CN201920883923.4) discloses a device for removing liquid accumulation in a long-distance natural gas pipeline. The device is installed between the pipes, and connects the air inlet and outlet with the natural gas pipeline, so that the accumulated liquid accumulates in the lower part of the drain pipe. The device of the invention can only solve the problem of liquid accumulation in a small section of the long-distance pipeline, destroys the integrity of the pipeline, and is more likely to cause leakage and pollute the environment.

SUMMARY OF THE INVENTION

In order to overcome the problem that the prior art is difficult to apply to lubricating oil suction, the present invention proposes a method for sucking lubricating oil in a gas transmission pipeline. The lubricating oil channel is designed to discharge the lubricating oil out of the pipeline, which solves the problem of lubricating oil suction.

In order to achieve the above object, the present invention realizes through the following scheme:

A method for sucking lubricating oil in a gas transmission pipeline, characterized in that it includes the following steps: S1: the lubricating oil position detection module monitors the lubricating oil deposition signal inside the pipeline in real time, and determines the lubricating oil deposition position; S2: the lubricating oil suction module sends the lubricating oil deposition The oil deposition signal is sent to the control terminal system, the control terminal system sends the oil suction signal to the lubricating oil suction module, and the electro-hydraulic control system sucks the lubricating oil; S3: The lubricating oil is completely sucked out, and the solenoid valve is closed to end the oil suction.

Further, the steps of determining the deposition position of the lubricating oil are as follows: S11: the lubricating oil position detection module calculates the liquid level height; S12: when the lubricating oil liquid level height is greater than the calibration height, the industrial CCD camera takes pictures of the gas pipeline, and uses the pictures to detect the height of the gas pipeline. A secondary correction of the oil deposit position is performed to determine that there is indeed an oil deposit at the target.

Further, the step S2 specifically includes the following steps: S21: when there is lubricating oil deposition, the lubricating oil suction module encodes this information and sends it to the control terminal system; S22: the data processing center of the control terminal system processes the information After processing, the oil suction signal is sent to the lubricating oil suction module by the signal transceiver; S23: The 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 the lubricating oil.

Further, in the step S3, the oil level sensor collects the oil level in real time before the lubricating oil is completely sucked out, and transmits the liquid level data to the DSP. When the liquid level height is lower than the set value, the solenoid valve is closed to end the oil absorption.

Further, in the step S2, the gravitational accelerometer A detects the angle between the oil suction port and the direction of gravitational acceleration in real time during the process of sucking out the lubricating oil. The oil suction port rotates to the direction of gravitational acceleration and then sucks oil.

Further, the process of sucking out the lubricating oil can also be realized by the following methods: 6-10 oil suction ports are evenly arranged in the circumferential direction, each oil suction port is provided with an electromagnetic switch valve, and the gravitational accelerometer A detects which oil suction port and the acceleration of gravity are detected in real time. The angle between the directions is the smallest, and the corresponding solenoid valve switch valve is opened to absorb oil.

Further, in the step S2, the pressure sensor monitors the internal pressure of the pipeline in real time, and calculates whether the pressure in the pipeline can suck out the lubricating oil. When power is turned on, the lubricating oil is sucked out by the pressure in the pipe. If the pressure in the pipe cannot suck out the lubricating oil, the two-position three-way solenoid valve is powered off, the booster pump is started, and the lubricating oil is pressurized and discharged for the second time.

Further, the parameters of suction pressure and suction power are set according to the viscosity, density of the lubricating oil, the deposition distance of the lubricating oil, and the size of the suction oil pipe.

Compared with the prior art, the present invention has the following advantages:

(1) A method for removing the lubricating oil retained in the gas pipeline is provided.

(2) High degree of automation and high efficiency.

(3) The use of pipeline robot technology increases safety and reduces the risk of leakage.

Description of drawings

Fig. 1 is the structural representation of the pipeline robot of the present invention;

2 is a schematic diagram of the composition of a control terminal system in the present invention;

Fig. 3 is the schematic diagram of lubricating oil suction module of the present invention;

4 is a schematic diagram of a lubricating oil position detection module of the present invention;

FIG. 5 is one of the structural schematic diagrams of the oil suction port of the present invention.

FIG. 6 is the second schematic diagram of the structure of the oil suction port of the present invention.

Fig. 7 is the flow chart of lubricating oil suction of the present invention.

FIG. 8 is a flow chart of the present invention to determine the location of the oil deposition.

In the figure: lubricating oil position detection module 1, lubricating oil suction module 2, electro-hydraulic control system 3, data acquisition and processing system 4, oil suction port 5, pipeline robot 6, control terminal system 7, memory (A) 8, acceleration of gravity Meter (A) 9, 2/3-way solenoid valve 10, booster pump 11, check valve (A) 12, check valve (B) 13, check valve (C) 14, umbilical cable 15, lubricating oil collection Device 16, pipeline 17, relief valve 18, oil suction port system 19, power off normally closed electromagnetic switch valve 20, pressure sensor 21, liquid level sensor 22, power module 23, industrial CCD camera 24, memory (B) 25, step Feed motor (A) 26 , ultrasonic liquid level detection sensor 27 , gravitational accelerometer (B) 28 , one-way valve (D) 29 , stepping motor (B) 30 , electromagnetic switch valve 31 .

Detailed ways

In order to have a clearer understanding of the technical features, objectives and effects of the present invention, specific embodiments of the present invention will now be described with reference to the accompanying drawings.

This embodiment provides a gas pipeline oil suction system, including a pipeline robot 6 and a control terminal system 7 . As shown in FIG. 1 , the pipeline robot 6 is arranged 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, as a carrier for lubricating oil suction; the oil suction ports 5 have a total of 6-10, which are evenly distributed in the circumferential direction.

As shown in Figure 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 transceiver, input device, storage unit, and display module are respectively connected to 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 trajectory position coordinates of the pipeline robot in real time.

As shown in FIG. 3 , the lubricating oil suction module 2 includes an electro-hydraulic control system 3 and a data acquisition and processing system 4. The electro-hydraulic control system 3 consists of a two-position three-way solenoid valve 10, a booster pump 11, a one-way Valve (A) 12, one-way valve (B) 13, one-way valve (C) 14, lubricating oil collecting device 16, relief valve 18, power-off normally closed electromagnetic switch valve 20; power-off normally closed electromagnetic switch valve 20 and the two-position three-way solenoid valve 10 are independently controlled by DSP, the power-off normally closed electromagnetic switch valve 20 is connected in series with the two-position three-way solenoid valve 10, and the two outlets of the two-position three-way solenoid valve 10 are respectively connected to the one-way valve (A) 12 and booster pump 11, booster pump 11 in series with check valve (B) 13, relief valve 18, check valve (A) 12, check valve (B) 13 in parallel, relief valve 18, check valve (A) 12. One-way valve (B) 13 is connected in series with one-way valve (C) 14, and one-way valve (C) 14 is connected in series with lubricating oil collecting device 16. The data acquisition and processing system is composed of a liquid level sensor 22, a pressure sensor 21, a gravitational accelerometer (A) 9, a memory (A) 8, AD, AD/DA. The liquid level sensor 22 detects the height of the lubricating oil level, and the pressure sensor 21 detects the pressure in the tube, and a gravity accelerometer (A) 9 detects the direction of gravity.

As shown in FIG. 4 , the lubricating oil position detection module 1 consists of a power 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; the stepping motor (A) 26, the ultrasonic liquid level detection sensor 27, and the gravitational accelerometer (B) 28 are independently controlled by DSP.

As shown in FIG. 5 , only a one-way valve (D) 29 is connected in series between the oil suction port 5 and the power-off normally closed electromagnetic switch valve 20, and a stepper motor (B) 30 is provided outside the oil suction port 5. Rotating the oil suction port 5 through the stepper motor (B) 30 realizes the selection of different oil suction ports 5 to suck lubricating oil

As shown in FIG. 6 , a check valve (D) 29 and an electromagnetic switch valve 31 are connected in series between the oil suction port 5 and the power-off normally-closed electromagnetic switch valve 20 . The electromagnetic switch valve 31 can be independently controlled, and the electromagnetic switch valve 31 The on-off is realized by selecting different oil suction ports 5 to suck lubricating oil.

As shown in Figures 7 and 8, a gas pipeline oil suction system, its working process includes the following steps: S1: The oil position detection module 1 monitors the oil deposition signal inside the pipeline 17 in real time, and determines the oil deposition position ; S2: The oil suction module 2 sends the oil deposition signal to the control terminal system 7, the control terminal system 7 sends the oil suction signal to the oil suction module 2, and the electro-hydraulic control system 3 sucks the oil; S3: The oil is completely sucked out , close the solenoid valve and end the oil suction. The steps for determining the position of the lubricating oil deposition are: S11: the lubricating oil position detection module 1 calculates the liquid level height; S12: when the lubricating oil liquid level height is greater than the calibration height, the industrial CCD camera 24 takes pictures of the gas pipeline, and uses the pictures to detect the lubricating oil. A secondary correction of the oil deposit location is performed to determine that there is indeed an oil deposit at the target. The step S2 specifically includes the following steps: S21: when there is lubricating oil deposition, the lubricating oil suction 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. After processing, the oil suction signal is sent to the lubricating oil suction module 2 by the signal transceiver; S23: the electro-hydraulic control system 3 in the lubricating oil suction module 2 controls the power-off normally closed electromagnetic switch valve 20 and the two-position three-way electromagnetic valve 10 Suck out the oil. In the step S3, before the lubricating oil is completely sucked out, the lubricating oil level sensor 22 collects the lubricating oil fluid level in real time, and transmits the fluid level data to the DSP. When the fluid level height is lower than the set value, the solenoid valve is closed to end the oil absorbing. In the step S2, the gravitational accelerometer (A) 9 detects the angle between the oil suction port 5 and the direction of gravitational acceleration in real time, and if the angle between the two is greater than 10°, the stepper motor (B) is started. 30. Rotate the lubricating oil suction port 5 to the direction of gravity acceleration in real time and then absorb the oil. The process of sucking out the lubricating oil in the step S2 can also be realized by the following methods: the oil suction ports 5 are evenly arranged in the circumferential direction of 6-10, each oil suction port 5 is provided with an electromagnetic switch valve 31, and the gravitational accelerometer A9 detects which oil suction port is in real time. The angle between 5 and the direction of gravitational acceleration is the smallest, and the corresponding solenoid valve switch valve 31 is opened to absorb oil. In the step S2, the pressure sensor 21 monitors the internal pressure of the pipeline 17 in real time, and calculates whether the pressure in the pipeline can suck out the lubricating oil. 10 is energized, and the lubricating oil is sucked out by the pressure in the pipe. If the pressure in the pipe 17 cannot suck out the lubricating oil, the two-position three-way solenoid valve 10 is powered off, and the booster pump 11 is started, and the lubricating oil is pressurized and discharged for a second time.

As shown in Figure 1-8, the working principle of a gas pipeline oil suction system: the body of the pipeline robot 6 is the carrier of each system of the pipeline robot 6, providing interfaces and installation positions for each system set on the body , the action of the pipeline robot 6 is realized by the support system and the telescopic mechanism, and the forward or backward of the pipeline robot 6 is realized by the alternate action of the support mechanism and the telescopic mechanism in the support system. According to the three-dimensional trajectory of the gas pipeline, the input device in the control terminal system 7 inputs the traction speed and traction force; according to the oil viscosity, density, oil deposition distance, and the size of the suction pipe, the parameters of suction pressure and suction power are set. The data processing center encodes the traction speed and traction force and transmits the data from the signal transceiver to the pipeline robot 6 in the pipeline. The pipeline robot 6 decodes the control signal and controls the proportional reversing valve of the support system to reverse the direction in a certain order to realize the pipeline. Robot 6 moves. While the pipeline robot 6 moves forward, the gravitational accelerometer (B) 28 in the lubricating oil position detection module 1 detects the angle between the oil suction port 5 and the direction of gravitational acceleration in real time, if the angle between the two is greater than 10° , start the stepper motor (A) 26 to rotate the lubricating oil suction port 5 to the direction of gravitational acceleration in real time. When there is lubricating oil deposition, the lubricating oil suction module 2 encodes this information and sends it to the control terminal system 7, and the control terminal system 7 decodes the received information and displays it on the display module, and the control terminal system 7. You can choose to stop the pipeline robot 6 for oil absorption or let the pipeline robot 6 continue to move forward. After the user chooses to stop the pipeline robot 6 for oil absorption, the data processing center will stop the pipeline robot 6 and carry out oil absorption information encoding and transmit the data from the signal transceiver to the Oil suction module 2. The pressure sensor 21 monitors the internal pressure of the pipeline 17 in real time, and calculates whether the pressure in the pipeline can suck out the lubricating oil. Use the pressure in the pipe to suck out the oil. If the pressure in the pipe 17 cannot suck out the lubricating oil, the two-position three-way solenoid valve 10 is powered off, the booster pump 11 is started, and the lubricating oil is pressurized and discharged for the second time. Before the lubricating oil is completely sucked out, the fluid level sensor 22 collects the lubricating oil fluid level in real time, and transmits the fluid level data to the DSP. When the fluid level is lower than the set value, the solenoid valve is closed to end the oil absorbing.

The above descriptions are only exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention. Equivalent changes and modifications made by any person skilled in the art without departing from the concept and principle of the present invention shall fall within the protection scope of the present 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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