Oxygen content monitoring pretreatment device for oil gas recovery

Abstract

The utility model relates to the technical field of detection equipment, in particular to an oxygen content monitoring pretreatment device for oil gas recovery, which comprises a cabinet and a cabinet door hinged on the front side of the cabinet, and a sample injection jet pump, a sample filtering tank, an oxygen content detection sensor and a rotor flow meter are arranged in the cabinet. One side of the sample injection jet pump is connected with a nitrogen pressure reducing valve I, the sample injection jet pump is connected with the sample filtering tank through a pipeline, and the sample filtering tank is connected with the oxygen content detection sensor through a pipeline; the oxygen content monitoring pretreatment device for oil and gas recovery can effectively isolate a process pipeline, can increase the operability of daily maintenance of instruments in a cabinet, can filter a sample, ensures that an oxygen content detection sensor is not interfered, improves the measurement precision, and also can prevent the oxygen content detection sensor from being interfered when a fan of a daily device is started to operate. The sampling flow is effectively stabilized due to the influence of phenomena such as negative pressure, suction and pressure fluctuation, so that the measurement environment of the oxygen content detection sensor is more stable.

Description

Technical Field

[0001] The utility model relates to the technical field of detection equipment, in particular to an oxygen content monitoring pretreatment device for oil and gas recovery. Background Art

[0002] After absorption in the absorption tower, the lean oil and gas enter the unit's air blower inlet, where it mixes with air and is then incinerated in the unit's heating furnace. Oil and gas containing a certain concentration of hydrocarbons are prone to explosion during intermediate processing steps such as degassing and absorption. Therefore, multiple monitoring and linkage protection devices should be installed on the lean oil and gas pipeline. Monitoring the oxygen content in the oil and gas can prevent explosions and ensure production safety, which requires the use of oxygen content sensors. Existing oxygen content sensors are typically installed directly on process pipelines, which presents numerous practical problems. The reasons are as follows: 1. Oxygen content sensors are susceptible to interference from moisture, frost, ice, dirt, and dust, leading to false alarms, shortening their service life, and even causing them to fail. 2. The lack of a shut-off device makes maintenance impossible during operation. 3. Negative pressure suction and pulse flow fluctuations can affect the proper oxygen content measurement. 4. Environmental conditions such as temperature, humidity, and airflow can affect the accuracy of oxygen detectors. Utility Model Content

[0003] In response to the shortcomings of the existing technology, the utility model provides an oxygen content monitoring pretreatment device for oil and gas recovery, which solves the technical problems of false alarms, short life, lack of maintenance conditions and poor accuracy caused by the existing oxygen content detection sensor directly installed on the process pipeline.

[0004] In order to solve the above technical problems, the utility model provides the following technical solutions: an oxygen content monitoring and pretreatment device for oil and gas recovery, comprising a cabinet and a cabinet door hinged on the front of the cabinet, wherein a sampling jet pump, a sample filter tank, an oxygen content detection sensor and a rotor flowmeter are installed in the cabinet, a nitrogen pressure reducing valve is connected to one side of the sampling jet pump, and the sampling jet pump is connected to the sample filter tank through a pipeline, the sample filter tank is connected to the oxygen content detection sensor through a pipeline, the oxygen content detection sensor is connected to the rotor flowmeter through a pipeline, the rotor flowmeter is connected to the sampling jet pump through a pipeline, the bottom of the sampling jet pump is connected to a sample inlet pipe and a sample outlet pipe, and a shut-off valve is installed on the sample inlet pipe and the sample outlet pipe, and two sets of fixing components that can be used for installation on oil and gas pipelines are fixed on the back of the cabinet;

[0005] The fixing assembly includes a fixing plate fixed to the back of the cabinet, a double-headed screw is rotatably connected inside the fixing plate, and sliders are spirally connected on the outer walls of the double-headed screw near both ends. The slider is slidably set in a sliding groove opened on the fixing plate, and a semi-arc-shaped splint is fixed on the slider.

[0006] Preferably, a drainage jet pump is also installed in the cabinet, the bottom of the drainage jet pump is connected to a drainage pipe, one side of the drainage jet pump is connected to a nitrogen pressure reducing valve 2, nitrogen pressure reducing valve 1 and nitrogen pressure reducing valve 2 are both connected to the nitrogen inlet pipe through a nitrogen diversion pipe, a needle valve is provided on one side of nitrogen pressure reducing valve 2 and is connected to the nitrogen inlet pipe through a pipeline, and the needle valve is installed at the bottom of the sample filter tank.

[0007] Preferably, one side of the oxygen content detection sensor is connected to a power supply wire, and the power supply wire passes through the outside of the cabinet.

[0008] Preferably, an air heater is installed on one side of the cabinet.

[0009] Preferably, a protective net is installed on the inner side of the cabinet near the air heater.

[0010] Preferably, a heat-insulating interlayer is provided in the side wall of the cabinet.

[0011] By means of the above technical solution, the utility model provides an oxygen content monitoring and pretreatment device for oil and gas recovery, which has at least the following beneficial effects:

[0012] 1. The oxygen content monitoring pretreatment device for oil and gas recovery is equipped with a shut-off valve and a sample filter tank. The oil and gas are isolated and cut off from the pipeline by the valve, which can effectively isolate the process pipeline and increase the operability of daily maintenance of various instruments inside the cabinet. Then, the sample filter tank removes water vapor, dust and other impurities, providing a clean, particulate-free sample to the oxygen content detection sensor. The sample then enters the oxygen content detection sensor for measurement, ensuring that the oxygen content detection sensor is not interfered with and improving its measurement accuracy.

[0013] 2. The oxygen content monitoring pretreatment device for oil and gas recovery is equipped with a sampling jet pump and a nitrogen pressure reducing valve. The sampling flow rate is controlled by the sampling jet pump, avoiding the influence of negative pressure, suction, pressure fluctuations and other phenomena that occur when the fan of the device is started up in daily operation, effectively stabilizing the sampling flow rate and making the measurement environment of the oxygen content detection sensor more stable.

[0014] 3. The oxygen content monitoring and pretreatment device for oil and gas recovery is equipped with a nitrogen pressure reducing valve 2 and a liquid discharge jet pump. The nitrogen pressure reducing valve 2 controls the operation of the liquid discharge jet pump, thereby achieving the discharge of liquid impurities in the sample filter tank.

[0015] 4. The oxygen content monitoring pretreatment device for oil and gas recovery can be installed directly on the pipeline by setting fixed components. It can be modified on the basis of existing pipelines, with the advantages of low modification difficulty and low cost.

[0016] 5. The oxygen content monitoring pretreatment device for oil and gas recovery can avoid the problem of decreased measurement accuracy of the oxygen content detection sensor caused by high temperature, low temperature, high humidity and other phenomena due to the influence of outdoor environmental factors by setting an air heater and a thermal insulation interlayer. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application:

[0018] Figure 1 It is a schematic diagram of the overall three-dimensional structure of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the connection of various instruments inside the cabinet of the utility model;

[0020] Figure 3 This is a schematic diagram of the structure of the fixing assembly of the utility model;

[0021] Figure 4 This is a schematic structural diagram of the cross section of the cabinet of the present invention;

[0022] Reference numerals:

[0023] 1. Cabinet; 2. Cabinet door; 3. Sample injection jet pump; 4. Sample filter tank; 5. Oxygen content detection sensor; 6. Rotor flowmeter; 7. Sample inlet pipe; 8. Sample outlet pipe; 9. Nitrogen pressure reducing valve 1; 10. Needle valve; 11. Discharge jet pump; 12. Nitrogen pressure reducing valve 2; 13. Discharge pipe; 14. Nitrogen diverter pipe; 15. Nitrogen inlet pipe; 16. Power supply wire; 17. Fixing assembly; 171. Fixing plate; 172. Double-head screw; 173. Slider; 174. Clamp; 18. Air heater; 19. Protective net; 20. Insulation interlayer; 21. Shut-off valve. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Oil and gas recovery refers to the collection of oil and gas generated during loading and unloading of ships or production equipment, as well as oil and gas volatilized from storage tanks. Through solvent absorption, adsorption, condensation and other process methods, the oil and gas is converted from gas to liquid. The oil and gas is then burned in a heating furnace or recovered, thereby reducing the pollution caused by the volatilization of the oil and gas and achieving the purpose of recycling.

[0026] Example 1:

[0027] Based on the technical defects of existing technologies such as false alarm, short life, no maintenance conditions and poor accuracy, please refer to Figures 1-4 The utility model provides an oxygen content monitoring and pretreatment device for oil and gas recovery, which can effectively isolate the process pipeline, increase the operability of daily maintenance of various instruments inside the cabinet 1, and measure the oxygen content detection sensor 5 after the oil and gas are filtered, so as to ensure that the oxygen content detection sensor 5 is not interfered with and improve its measurement accuracy. The device includes a cabinet 1 and a cabinet door 2 hinged on the front of the cabinet 1. A sampling jet pump 3, a sample filter tank 4, an oxygen content detection sensor 5 and a rotor flowmeter 6 are installed in the cabinet 1. A nitrogen pressure reducing valve 9 is connected to one side of the sampling jet pump 3, and the sampling jet pump 3 is connected to the sample filter tank 4 through a pipeline. The sample filter tank 4 is connected to the oxygen content detection sensor 5 through a pipeline. The oxygen content detection sensor 5 is connected to the rotor The flowmeter 6 is connected through a pipeline, and the rotor flowmeter 6 is connected to the sampling jet pump 3 through a pipeline. The bottom of the sampling jet pump 3 is connected to a sample inlet pipe 7 and a sample outlet pipe 8. The sample inlet pipe 7 and the sample outlet pipe 8 are both installed with a shut-off valve 21. The back of the cabinet 1 is fixed with two groups of fixing components 17 that can be used to be installed on the oil and gas pipeline; first, the entire cabinet 1 is installed on the oil and gas pipeline through the fixing component 17, and then in daily use, under the action of the sampling jet pump 3, the sample enters the sample filter tank 4 from the sample inlet pipe 7, and after filtration, enters the oxygen content detection sensor 5 for measurement, and after measurement, enters the rotor flowmeter 6 to calculate the flow rate, and then the sample is discharged from the sample outlet pipe 8 through the sampling jet pump 3 again.

[0028] To solve the installation problem of cabinet 1, please refer to Figure 3 The fixing assembly 17 includes a fixing plate 171 fixed to the back of the cabinet 1, and a double-headed screw 172 is rotatably connected inside the fixing plate 171. The outer walls of the double-headed screw 172 near both ends are spirally connected with sliders 173. The slider 173 is slidably set in the slide groove opened on the fixing plate 171, and a semi-arc-shaped clamping plate 174 is fixed on the slider 173; the double-headed screw 172 is rotated and the two sliders 173 are driven to move relative to each other, so that the two clamping plates 174 are close to each other and clamped on the oil and gas pipeline, so that the whole can be directly installed on the oil and gas pipeline, taking up less space and being more convenient to install.

[0029] In order to solve the problem of discharging impurities inside the sample filter tank 4, a drainage jet pump 11 is also installed in the cabinet 1. The bottom of the drainage jet pump 11 is connected to a drainage pipe 13, and one side of the drainage jet pump 11 is connected to a nitrogen pressure reducing valve 2 12. The nitrogen pressure reducing valve 1 9 and the nitrogen pressure reducing valve 2 12 are both connected to the nitrogen inlet pipe 15 through a nitrogen diversion pipe 14. A needle valve 10 is provided on one side of the nitrogen pressure reducing valve 2 12 and is connected to the nitrogen inlet pipe 15 through a pipeline. The needle valve 10 is installed at the bottom of the sample filter tank 4; after opening the needle valve 10, the nitrogen pressure reducing valve 2 12 controls the operation of the drainage jet pump 11, thereby discharging the liquid impurities in the sample filter tank 4 from the drainage pipe 13.

[0030] In order to ensure the normal operation of the oxygen content detection sensor 5, a power supply wire 16 is connected to one side of the oxygen content detection sensor 5. The power supply wire 16 runs through the outside of the cabinet 1; the oxygen content detection sensor 5 can be powered by the power supply wire 16.

[0031] Example 2:

[0032] When the ambient temperature is low, the recovered oil and gas has a high humidity. When low temperature occurs, it will condense and carry liquid. The liquid in the pipeline will cause the sensor to fail to measure, and insulation and heating are required. In order to improve the stability of the instrument operation, an air heater 18 is installed on one side of the cabinet 1, and a protective net 19 is installed on the inside of the cabinet 1 near the air heater 18. When the ambient temperature is low, the air heater 18 can be used to increase the internal temperature of the cabinet 1, thereby ensuring that each instrument can operate stably.

[0033] In order to improve the accuracy of the oxygen content detection sensor 5, a thermal insulation interlayer 20 is provided in the side wall of the cabinet 1; this can avoid the problem that the oxygen content detection sensor 5 fails to measure due to high temperature, low temperature, high humidity and other phenomena caused by outdoor environmental factors.

[0034] It can be seen from the above embodiment that: first, under the action of the fixing component 17, the double-headed screw 172 is rotated and the two sliders 173 are driven to move relative to each other, so that the two clamping plates 174 are close to each other and clamped on the oil and gas pipeline, so that the whole can be directly installed on the oil and gas pipeline. Then, in daily use, under the action of the sampling jet pump 3, the sample enters the sample filter tank 4 from the sample inlet pipe 7, and after filtration, enters the oxygen content detection sensor 5 for measurement. After measurement, it enters the rotor flowmeter 6 to calculate the flow rate, and then the sample is discharged from the sample outlet pipe 8 through the sampling jet pump 3 again.

[0035] It should be noted that the terms "comprises", "includes" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or apparatus that includes a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements that are inherent to such process, method, article or apparatus.

[0036] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An oxygen content monitoring and pretreatment device for oil and gas recovery, comprising a cabinet (1) and a cabinet door (2) hinged to the front of the cabinet (1), characterized in that: The cabinet (1) is equipped with a sample injection jet pump (3), a sample filter tank (4), an oxygen content detection sensor (5) and a rotor flow meter (6); a nitrogen pressure reducing valve (9) is connected to one side of the sample injection jet pump (3); the sample injection jet pump (3) is connected to the sample filter tank (4) through a pipeline; the sample filter tank (4) is connected to the oxygen content detection sensor (5) through a pipeline; the oxygen content detection sensor (5) is connected to the rotor flow meter (6) through a pipeline; the rotor flow meter (6) is connected to the sample injection jet pump (3) through a pipeline; the bottom of the sample injection jet pump (3) is connected to a sample liquid inlet pipe (7) and a sample liquid outlet pipe (8); a cut-off valve (21) is installed on each of the sample liquid inlet pipe (7) and the sample liquid outlet pipe (8); and two sets of fixed components (17) that can be used for installation on oil and gas pipelines are fixed on the back of the cabinet (1); The fixing assembly (17) comprises a fixing plate (171) fixed to the back of the cabinet (1), a double-headed screw (172) being rotatably connected in the fixing plate (171), a slider (173) being spirally connected on the outer wall of the double-headed screw (172) near both ends, the slider (173) being slidably arranged in a slide groove provided on the fixing plate (171), and a semi-arc-shaped clamping plate (174) being fixed on the slider (173).

2. The oxygen content monitoring pretreatment device for oil and gas recovery according to claim 1 is characterized in that: A liquid discharge jet pump (11) is also installed in the cabinet (1). The bottom of the liquid discharge jet pump (11) is connected to a liquid discharge pipe (13). One side of the liquid discharge jet pump (11) is connected to a nitrogen pressure reducing valve (12). The nitrogen pressure reducing valve (9) and the nitrogen pressure reducing valve (12) are both connected to a nitrogen inlet pipe (15) through a nitrogen diverter pipe (14). A needle valve (10) is provided on one side of the nitrogen pressure reducing valve (12) and is connected to the nitrogen inlet pipe (15) through a pipeline. The needle valve (10) is installed at the bottom of the sample filter tank (4).

3. The oxygen content monitoring pretreatment device for oil and gas recovery according to claim 1 is characterized in that: One side of the oxygen content detection sensor (5) is connected to a power supply wire (16), and the power supply wire (16) passes through the outside of the cabinet (1).

4. The oxygen content monitoring pretreatment device for oil and gas recovery according to claim 1 is characterized in that: An air heater (18) is installed on one side of the cabinet (1).

5. The oxygen content monitoring pretreatment device for oil and gas recovery according to claim 4 is characterized in that: A protective net (19) is installed on the inner side of the cabinet (1) near the air heater (18).

6. The oxygen content monitoring and pretreatment device for oil and gas recovery according to claim 1 is characterized in that: A heat-insulating interlayer (20) is provided in the side wall of the cabinet (1).

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