Large tank air exhaust and pressurization separation type compression conveying device

Abstract

The utility model discloses a large tank air exhaust and pressurization separation type compression conveying device. The system comprises a gas inlet separation unit, a compression conveying unit connected with a gas phase pipeline of the gas inlet separation unit, a pressurization separation unit connected with a gas phase pipeline of the compression conveying unit, and a quick discharge emptying unit connected with gas phase pipelines of the gas inlet separation unit, the compression conveying unit and the pressurization separation unit (300), and the two-stage gas supply unit is connected with the gas phase pipelines of the gas inlet separation unit and the pressurization separation unit. According to the large tank air exhaust and pressurization separation type compression conveying device, air inlet separation, compression conveying and pressurization separation are combined, two times of air-liquid separation and compression conveying under pressure are achieved, the conveying distance is long, and safety and reliability are achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of oil and gas recovery in oil fields, and in particular relates to a large tank vacuuming, pressurizing, separating and compressing conveying device. Background Art

[0002] With the continuous deepening of oil field development and increasingly stringent environmental protection requirements, the problem of oil and gas volatilization has become increasingly prominent: during oil field production operations, large oil storage tanks usually volatilize a large amount of oil and gas, which not only contain valuable hydrocarbon components, but may also contain harmful gases such as hydrogen sulfide.

[0003] Traditional oil and gas processing methods pose challenges such as resource waste and environmental pollution. For example, long-term operation of activated carbon adsorption affects the adsorption efficiency due to the saturation of the activated carbon and other adsorbents, requiring regular replacement or regeneration, which is costly. Membrane separation methods are relatively expensive, and the selection and replacement of membrane materials require a high level of expertise.

[0004] It is of great significance to use oil and gas recovery technology to recover and treat these volatile gases. Therefore, it is particularly urgent and important to seek better and more optimal oil and gas recovery technologies and processes to solve the above problems or optimize existing technologies. Summary of the Invention

[0005] Purpose of the invention: In order to overcome the deficiencies in the prior art, the utility model provides a large tank vacuum pressurization separation type compression and conveying device.

[0006] Technical solution: The utility model provides a large-tank vacuum pressurized separation type compression and conveying device, which includes an air intake separation unit, a compression and conveying unit connected to the gas phase pipeline of the air intake separation unit, a pressurized separation unit connected to the gas phase pipeline of the compression and conveying unit, an emergency air discharge unit connected to the gas phase pipelines of the air intake separation unit, the compression and conveying unit and the pressurized separation unit, and a two-stage air supply unit connected to the gas phase pipelines of the air intake separation unit and the pressurized separation unit.

[0007] Preferably, the air intake separation unit includes an air intake shut-off valve, an air intake separation tank connected to the air outlet end of the air intake shut-off valve, an inlet discharge valve connected to the liquid outlet end of the air intake separation tank, and an infusion pump connected to the outlet end of the inlet discharge valve.

[0008] Further preferably, it further includes an air intake flame arrester; the air intake end of the air intake flame arrester is connected to the air outlet end of the air intake shut-off valve, and the air outlet end of the air intake flame arrester is connected to the gas inlet of the air intake separation tank;

[0009] The gas inlet of the large tank of the device is connected to the inlet end of the air intake cut-off valve;

[0010] An intake pressure transmitter is provided on the pipeline connecting the large tank exhaust gas inlet and the intake shut-off valve inlet end; an oxygen content detector is provided on the pipeline connecting the outlet of the intake flame arrester and the gas inlet of the intake separation tank.

[0011] Preferably, the gas phase pipeline of the compression and delivery unit includes an air intake filter, a loading valve connected to the outlet end of the air intake filter, a gas compressor connected to the outlet end of the loading valve, an oil-gas separator connected to the outlet end of the gas compressor, an oil-gas one-way valve connected to the first air outlet end of the oil-gas separator, a reflux cut-off valve connected to the second air outlet end of the oil-gas separator, and an air-cooled heat exchanger connected to the outlet end of the oil-gas one-way valve;

[0012] The other end of the reflux cut-off valve is communicated with the inlet end of the loading valve.

[0013] More preferably, it also includes a hand valve;

[0014] The opening of the manual valve is adjustable;

[0015] One end of the hand valve is communicated with the inlet end of the loading valve, and the other end of the hand valve is communicated with the outlet end of the loading valve;

[0016] The ratio of the diameter of the hand valve to the diameter of the loading valve is 1:8-10.

[0017] Preferably, the outlet end of the air-cooled heat exchanger is connected to the inlet end of the air outlet separation tank (301); and the inlet end of the air intake filter is connected to the first air outlet end of the air intake separation tank (104).

[0018] Further preferably, an oil temperature transmitter is provided on the pipeline connecting the gas compressor outlet and the oil-gas separator inlet.

[0019] Further preferably, an air-cooled temperature transmitter and an outlet air pressure transmitter are provided on the outlet pipeline of the air-cooled heat exchanger.

[0020] Further preferably, a liquid level transmitter is provided at the liquid storage portion at the lower portion of the oil-gas separator.

[0021] Preferably, the oil phase pipeline of the compression and delivery unit includes an oil-gas separator, an oil-cooling heat exchanger connected to the oil outlet end of the oil-gas separator, an oil filter connected to the outlet end of the oil-cooling heat exchanger, and an oil shut-off valve connected to the outlet end of the oil filter; the other end of the oil shut-off valve is connected to the oil return port of the gas compressor.

[0022] Preferably, the pressurized separation unit includes a gas outlet separation tank, a gas outlet flame arrester connected to the first gas outlet end of the gas outlet separation tank, a gas outlet cut-off valve connected to the outlet end of the gas outlet flame arrester, and an outlet drain valve connected to the liquid outlet end of the gas outlet separation tank;

[0023] The outlet end of the gas shut-off valve is connected to the user-end pipe network; the other end of the outlet drain valve is connected to the drain outlet.

[0024] Further preferably, the emergency discharge unit includes an emergency discharge valve, an oil safety valve and a gas safety valve;

[0025] The inlet end of the emergency vent valve is connected to the second outlet end of the air inlet separation tank;

[0026] The inlet end of the oil safety valve is connected to the third outlet end of the oil-gas separator;

[0027] The inlet end of the gas separation safety valve is connected to the second gas outlet end of the gas separation tank;

[0028] The outlet end of the emergency vent valve, the outlet end of the oil safety valve and the outlet end of the gas safety valve are all connected to the emergency discharge pipe.

[0029] Further preferably, the two-stage air supply unit includes a primary air supply regulating valve, a secondary air supply regulating valve, and an air supply cut-off valve connected to the inlet end of the secondary air supply regulating valve;

[0030] The inlet end of the gas supply shut-off valve is connected to the natural gas pipeline;

[0031] The outlet of the secondary air supply regulating valve is connected to the inlet of the air intake shut-off valve;

[0032] The outlet of the first-stage air supply regulating valve is connected to the inlet of the air intake shut-off valve;

[0033] The inlet end of the first-stage air supply regulating valve is connected to the third air outlet end of the air outlet separation tank.

[0034] More preferably, the first-stage air supply regulating valve and the second-stage air supply regulating valve are both interlockedly controlled with an air intake pressure transmitter provided on a pipeline connected to an inlet end of the air intake shut-off valve.

[0035] Beneficial effects: The large tank vacuum pressurization separation compression and conveying device provided by the utility model has the following advantages over the prior art:

[0036] (1) The large tank vacuum pressurized separation type compression conveying device provided by the utility model can realize two gas-liquid separation and compressed pressure conveying by combining air intake separation, compression conveying and pressurized separation. Not only is the conveying distance long, which can be up to several thousand meters, but the device / system is also safe and reliable in normal temperature conveying; and thinner conveying pipelines can be configured to effectively save the cost of the device / system equipment.

[0037] (2) In the large tank vacuum pressurization separation type compression and conveying device provided by the utility model, a two-stage air supply unit connected to the gas phase pipeline of the air intake separation unit and the pressurization separation unit can realize the all-weather stable operation of the device / system, which greatly improves the stability and reliability of the operation of the device / system.

[0038] (3) The large tank vacuum pressurization separation compression and conveying device provided by the utility model is equipped with a three-stage emergency discharge system, which eliminates the risk of overpressure and has high safety.

[0039] Overall, the structure and construction provided by this utility model combine pressurized separation recovery with compressed delivery, effectively overcoming resistance during fluid delivery, enabling faster and longer-distance transmission of oil and gas, significantly improving oil and gas recovery efficiency, and effectively reducing both equipment and maintenance costs. Furthermore, the pressurized gas output by the large-tank vacuum, pressurized separation, compressed delivery device provided by this utility model can be directly fed into the pipeline network, achieving environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a schematic structural diagram of one of the large tank vacuum pressurization separation type compression and conveying devices provided in this embodiment.

[0041] In the figure, 100-intake separation unit, 200-compression and delivery unit, 300-pressurization separation unit, 400-emergency air discharge unit, 500-two-stage air supply unit;

[0042] 101-intake shut-off valve, 102-intake flame arrester, 103-oxygen content detector, 104-intake separation tank, 105-infusion pump, 106-intake pressure transmitter, 107-inlet drain valve;

[0043] 201-Inlet filter, 202-Loading valve, 203-Gas compressor, 204-Oil-gas separator, 205-Oil-gas check valve, 206F-Air cooling fan, 206H-Air cooling heat exchanger, 207-Temperature transmitter, 208-Outlet pressure transmitter, 209F-Oil cooling fan, 209H-Oil cooling heat exchanger, 210-Liquid level transmitter, 211-Oil filter, 212-Oil shut-off valve, 213-Oil temperature transmitter, 214-Return shut-off valve, 215-Hand valve;

[0044] 301-gas outlet separation tank, 302-gas outlet flame arrester, 303-gas outlet shut-off valve, 304-outlet drain valve;

[0045] 401-Emergency vent valve, 402-Oil safety valve, 403-Gas safety valve;

[0046] 501-first-stage air supply regulating valve, 502-second-stage air supply regulating valve, 503-air supply cut-off valve. DETAILED DESCRIPTION

[0047] The present invention will be further described in detail below with reference to the embodiments and drawings. The following embodiments do not limit the present invention.

[0048] This embodiment provides a large tank vacuum pressurization separation type compression and conveying device, such as Figure 1 As shown, it includes an air intake separation unit 100, a compression and conveying unit 200 connected to the gas phase pipeline of the air intake separation unit 100, a pressurized separation unit 300 connected to the gas phase pipeline of the compression and conveying unit 200, an emergency air discharge unit 400 connected to the gas phase pipelines of the air intake separation unit 100, the compression and conveying unit 200 and the pressurized separation unit 300, and a two-stage air supply unit 500 connected to the gas phase pipelines of the air intake separation unit 100 and the pressurized separation unit 300.

[0049] like Figure 1 As shown, the emergency air discharge unit 400 includes an oil safety valve 402 and a gas safety valve 403.

[0050] like Figure 1 As shown, the two-stage air supply unit 500 includes a first-stage air supply regulating valve 501 and a second-stage air supply regulating valve 502 .

[0051] In this embodiment, specifically, the air intake separation unit 100 includes an air intake shut-off valve 101, an air intake separation tank 104 connected to the air outlet end of the air intake shut-off valve 101, an inlet discharge valve 107 connected to the liquid outlet end of the air intake separation tank 104, and an infusion pump 105 connected to the outlet end of the inlet discharge valve 107;

[0052] The system further includes an air intake flame arrester 102; the air intake end of the air intake flame arrester 102 is connected to the air outlet end of the air intake shut-off valve 101, and the air outlet end of the air intake flame arrester 102 is connected to the gas inlet (i.e., the air intake end) of the air intake separation tank 104. In other words, the air intake flame arrester 102 is further provided between the air outlet end of the air intake shut-off valve 101 and the gas inlet of the air intake separation tank 104.

[0053] It can also be said that: the air intake separation unit 100 includes an air intake shut-off valve 101, an air intake flame arrester 102 connected to the air outlet end of the air intake shut-off valve 101, an air intake separation tank 104 connected to the air outlet end of the air intake flame arrester 102, an inlet drain valve 107 connected to the liquid outlet end of the air intake separation tank 104, and an infusion pump 105 connected to the outlet end of the inlet drain valve 107.

[0054] In this embodiment, the gas inlet of the large tank of the device is connected to the inlet end of the air intake cut-off valve 101;

[0055] An intake pressure transmitter 106 is provided on the pipeline connecting the gas inlet of the large tank and the inlet end of the intake shut-off valve 101; an oxygen content detector 103 is provided on the pipeline connecting the outlet of the intake flame arrester 102 and the gas inlet of the intake separation tank 104.

[0056] In this embodiment, specifically, the gas phase pipeline of the compression and delivery unit 200 includes an air intake filter 201, a loading valve 202 connected to the outlet end of the air intake filter 201, a gas compressor 203 connected to the outlet end of the loading valve 202, an oil-gas separator 204 connected to the outlet end of the gas compressor 203, an oil-gas check valve 205 connected to a first air outlet end of the oil-gas separator 204, a reflux cut-off valve 214 connected to a second air outlet end of the oil-gas separator 204, and an air-cooled heat exchanger 206H connected to the outlet end of the oil-gas check valve 205;

[0057] The other end of the backflow cutoff valve 214 is connected to the inlet of the loading valve 202. Alternatively, the other end of the backflow cutoff valve 214 is connected to the inlet of the loading valve 202 and the outlet of the air intake filter 201 (i.e., the gas outlet). Gas is output from the other end of the backflow cutoff valve 214 and / or the outlet of the air intake filter 201 to the inlet of the loading valve 202.

[0058] In this embodiment, the outlet end of the air-cooled heat exchanger 206H is connected to the inlet end of the air outlet separation tank 301 ; the inlet end of the air intake filter 201 is connected to the first air outlet end of the air intake separation tank 104 .

[0059] In some preferred embodiments, an oil temperature transmitter 213 is provided on the pipeline connecting the outlet of the gas compressor 203 and the inlet of the oil-gas separator 204. In some preferred embodiments, an air-cooled temperature transmitter 207 and an outlet pressure transmitter 208 are provided on the outlet pipeline of the air-cooled heat exchanger 206H.

[0060] In certain preferred embodiments, a liquid level transmitter 210 is provided at the liquid storage portion (also referred to as the liquid storage portion) at the lower portion of the oil-gas separator 204 .

[0061] In this embodiment, specifically, the oil phase pipeline of the compression and delivery unit 200 includes an oil-gas separator 204, an oil-cooling heat exchanger 209H connected to the oil outlet end of the oil-gas separator 204, an oil filter 211 connected to the outlet end of the oil-cooling heat exchanger 209H, and an oil shut-off valve 212 connected to the outlet end of the oil filter 211; the other end of the oil shut-off valve 212 is connected to the oil return port (also called the oil phase pipeline inlet) of the gas compressor 203.

[0062] In this embodiment, specifically, the pressurized separation unit 300 includes a gas outlet separation tank 301, a gas outlet flame arrester 302 connected to the first gas outlet end of the gas outlet separation tank 301, a gas outlet shut-off valve 303 connected to the outlet end of the gas outlet flame arrester 302, and an outlet liquid discharge valve 304 connected to the liquid outlet end of the gas outlet separation tank 301.

[0063] In this embodiment, the outlet end of the gas shut-off valve 303 is connected to the user-side pipe network; the other end (i.e., the liquid outlet end) of the outlet liquid discharge valve 304 is connected to the liquid discharge outlet. In this embodiment, the liquid outlet end of the outlet liquid discharge valve 304 is connected to the liquid discharge outlet provided in the air intake separation unit 100.

[0064] In this embodiment, specifically, the emergency discharge and air-evacuation unit 400 includes an emergency discharge valve 401, an oil safety valve 402, and a gas safety valve 403;

[0065] The inlet end of the emergency vent valve 401 is connected to the second outlet end of the air inlet separation tank 104;

[0066] The inlet end of the oil safety valve 402 is connected to the third outlet end of the oil-gas separator 204;

[0067] The inlet end of the gas separation safety valve 403 is connected to the second gas outlet end of the gas separation tank 301;

[0068] The outlet end of the emergency vent valve 401, the outlet end of the oil safety valve 402 and the outlet end of the gas safety valve 403 are all connected to the emergency discharge pipe.

[0069] In this embodiment, specifically, the two-stage air supply unit 500 includes a primary air supply regulating valve 501, a secondary air supply regulating valve 502, and an air supply cut-off valve 503 connected to the inlet end of the secondary air supply regulating valve 502;

[0070] The inlet end of the gas supply cut-off valve 503 is connected to the natural gas pipeline (that is, connected to the user-side natural gas pipeline for natural gas supply);

[0071] The outlet of the secondary air supply regulating valve 502 is connected to the inlet of the air intake cut-off valve 101;

[0072] The outlet of the first-stage air supply regulating valve 501 is connected to the inlet of the air intake cut-off valve 101;

[0073] The inlet of the first-stage air supply regulating valve 501 is connected to the third outlet of the air outlet separation tank 301. The third outlet of the air outlet separation tank 301, also known as the air supply outlet, is used to output supplementary gas to the first-stage air supply regulating valve 501 in the two-stage air supply unit 500.

[0074] In certain preferred embodiments, the air-cooled heat exchanger 206H is equipped with an air-cooled fan 206F.

[0075] In certain preferred embodiments, the oil-cooling heat exchanger 209H is equipped with an oil-cooling fan 209F.

[0076] In some preferred embodiments, the gas compressor 203 uses a variable frequency single screw.

[0077] In certain preferred embodiments, when the gas compressor 203 is in the powered-on loading state, or the gas compressor 203 is in the powered-off unloading state, the backflow shut-off valve 214 is opened;

[0078] When the gas compressor 203 is started and loaded, or when the gas compressor 203 is shut down and unloaded, the reflux cut-off valve 214 is closed;

[0079] When the gas compressor 203 is running, the gas outlet shut-off valve 303 is opened;

[0080] When the gas compressor 203 is turned off, the gas outlet shut-off valve 303 is closed;

[0081] When the secondary air supply regulating valve 502 is opened, the air supply cut-off valve 503 is opened; when the secondary air supply regulating valve 502 is closed, the air supply cut-off valve 503 is closed.

[0082] In certain preferred embodiments, the air inlet shut-off valve 101 , the air outlet shut-off valve 303 and the return shut-off valve 214 are all interlocked with the gas compressor 203 .

[0083] In certain preferred embodiments, the air-cooling temperature transmitter 207 is interlockedly controlled with the air-cooling fan 206F.

[0084] In certain preferred embodiments, the oil temperature transmitter 213 is interlocked with the oil cooling fan 209F.

[0085] In certain preferred embodiments, the outlet gas pressure transmitter 208 and the liquid level transmitter 210 are both interlocked with the gas compressor 203 .

[0086] In certain preferred embodiments, the oxygen content detector 103 is interlocked with the emergency vent valve 401 and the gas compressor 203 .

[0087] In certain preferred embodiments, both the primary air supply regulating valve 501 and the secondary air supply regulating valve 502 are interlocked with the intake air pressure transmitter 106 for control.

[0088] In certain preferred embodiments, the infusion pump 105 is interlocked with the high and low liquid level indicators of the air inlet separation tank 104 for control.

[0089] In certain preferred embodiments, the outlet liquid discharge valve 304 is interlocked with the high and low liquid level indicators of the gas outlet separation tank 301 for control.

[0090] In some preferred embodiments, a manual valve 215 with adjustable opening is further included and connected in parallel with the loading valve 202. The manual valve 215 is always open when the gas compressor 203 is started for loading, after loading is completed, when it is shut down for unloading, and after unloading is completed.

[0091] Manual valve 215 is connected in parallel with loading valve 202 (parallel herein also includes physical parallel connection of pipelines, i.e., parallel connection of pipelines). The ratio of the flow volume of manual valve 215 to the flow volume of loading valve 202 is 1:8-10. One end of manual valve 215 is connected to the inlet of loading valve 202, and the other end of manual valve 215 is connected to the outlet of loading valve 202.

[0092] Taking one of the large tank vacuum pressurization separation type compression and conveying devices provided in the above embodiment as an example, its related working principle / workflow is explained as follows:

[0093] In the air separation unit 100: the gas drawn from the large tank passes through the air shut-off valve 101 and the air flame arrester 102 in sequence, and then enters the air separation tank 104 for buffering and first gas-liquid separation to separate free water and / or some heavy hydrocarbons;

[0094] In the compression and delivery unit 200: the gas extracted from the large tank after the first gas-liquid separation in the air intake separation unit 100 enters the compression and delivery unit 200, first passes through the air intake filter 201 for high-efficiency filtration and separation (to protect the gas compressor from impurities entering, high-efficiency filtration and separation requires a filtration level of not less than 10μm), then enters the dynamic equipment gas compressor 203 through the loading valve 202 for room temperature compression and pressurization to a first compression and pressurization threshold (e.g., 0.6MPa), and the pressurized gas enters the oil-gas separator 204 for gas and oil separation, and the separated gas is discharged from the first gas outlet of the oil-gas separator 204, discharged in one direction through the oil-gas one-way valve 205, and is output to the air-cooled heat exchanger 206H for air-cooled heat exchange and cooling to room temperature, and then output to the pressurized separation unit 300;

[0095] In the pressurized separation unit 300: the pressurized gas at room temperature after being pressurized by the compression and delivery unit 200 enters the pressurized separation unit 300, first enters the gas outlet separation tank 301 for the second gas-liquid separation, and after separating the supersaturated water and / or part of the light hydrocarbons, it is output to the outside through the gas outlet flame arrester 302 and the gas outlet shut-off valve 303 in sequence; if the output gas is delivered to the gas transmission network, that is, Figure 1 The main process of the gas circuit of the device / system includes the process of gas separation, compression and transportation, and pressurization and separation, completing the main process of the gas circuit of the device / system;

[0096] In the emergency air discharge unit 400: when the oxygen content measured by the oxygen content detector 103 in the air intake separation unit 100 is higher than a first preset oxygen content threshold (the first preset oxygen content threshold is adjustable, such as 5%), the emergency vent valve 401 in the emergency air discharge unit 400 is opened to perform emergency air discharge; when the pressure of the oil separation safety valve 402 in the emergency air discharge unit 400 exceeds its set pressure, the oil separation safety valve 402 is opened to perform emergency air discharge; when the pressure of the gas separation safety valve 403 in the emergency air discharge unit 400 exceeds its set pressure, the gas separation safety valve 403 is opened to perform emergency air discharge;

[0097] In the two-stage air supply unit 500: after the device / system is turned on, the first-stage air supply is turned on first (at this time, when the two-stage air supply unit 500 is in the first-stage air supply: the first-stage air supply regulating valve 501 is opened, and the second-stage air supply regulating valve 502 is closed), and the opening of the first-stage air supply regulating valve 501 is adjusted to make the pressure value measured by the intake pressure transmitter 106 stabilized near the first preset pressure stable value; when the opening of the first-stage air supply regulating valve 501 is adjusted to the maximum and is still insufficient, the second-stage air supply regulating valve 502 is opened to start the second-stage air supply (when the second-stage air supply: the first-stage air supply regulating valve 501 and the second-stage air supply regulating valve 502 are both opened, and the opening of the first-stage air supply regulating valve 501 reaches the maximum value), and the opening of the second-stage air supply regulating valve 502 is adjusted to make the pressure value measured by the intake pressure transmitter 106 stabilized near the second preset pressure stable value.

[0098] In this example, the gas compressor 203 is a dynamic equipment of the device / system. While compressing the gas, it also realizes the extraction of evaporated oil and gas from the oil storage tank. The large tank extraction mentioned in this article refers to the extraction of evaporated oil and gas into the oil storage tank by the gas compressor of the dynamic equipment of the device / system.

[0099] This example also includes:

[0100] The compressor starts loading; specifically, when the measured value of the intake pressure transmitter 106 rises to a first preset pressure threshold (the first preset pressure threshold is adjustable, such as 500 Pa), the intake shut-off valve 101 is opened, the gas compressor 203 is started for loading (the default loading time is 15 seconds), and after loading is completed, the loading valve 202 is opened;

[0101] Compressor shutdown unloading; specifically, when the measured value of the intake pressure transmitter 106 drops to a second preset pressure threshold (the second preset pressure threshold is adjustable, such as 200 Pa), the intake shut-off valve 101 is closed, the loading valve 202 is closed, and then the gas compressor is unloaded (the shutdown unloading period is 15 seconds by default). After the unloading is completed, the gas compressor 203 is shut down;

[0102] specifically comprising: the liquid separated from the first gas-liquid separation in the gas inlet separation tank 104, and the liquid separated from the second gas-liquid separation in the gas outlet separation tank 301, are transported to a designated liquid storage tank for liquid collection and recovery.

[0103] In this example, when the gas compressor 203 is in the powered-on loading state, or the gas compressor 203 is in the powered-off unloading state, the reflux shut-off valve 214 is opened;

[0104] When the gas compressor 203 is started and loaded, or when the gas compressor 203 is shut down and unloaded, the reflux cut-off valve 214 is closed.

[0105] Specifically, when the gas compressor 203 is started and loaded, the air intake shut-off valve 101 is opened, the loading valve 202 is closed, and the return air shut-off valve 214 is opened. At this time, the gas from the air intake separation unit 100 is input into the gas compressor 203 through the air intake filter 201 and the manual valve 215, and / or the return air from the oil-gas separator 204 is input into the gas compressor 203 through the return air shut-off valve 214 and the manual valve 215, to ensure the continuous operation of the gas compressor 203.

[0106] When the gas compressor 203 is loaded, the air intake shut-off valve 101 is opened, the loading valve 202 is opened, and the return shut-off valve 214 is closed. At this time, the gas compressor 203 operates normally to achieve the extraction of volatile oil and gas from the oil storage tank and gas compression.

[0107] When the gas compressor 203 is shut down and unloaded, the air intake shut-off valve 101 is closed, the loading valve 202 is closed, and the return air shut-off valve 214 is opened. At this time, the return air from the oil-gas separator 204 is input into the gas compressor 203 through the return air shut-off valve 214 and the manual valve 215 to reduce the pressure in the oil-gas separator 204 until the gas compressor 203 is shut down after unloading is completed.

[0108] An additional flow path is provided by providing a manual valve 215, which is arranged in parallel with the loading valve 202 and has an adjustable opening ratio with a range of 1:8 to 10 to the flow volume of the loading valve 202. Alternatively, a bypass is provided by the adjustable opening manual valve 215 and the pipeline in which it is located, which is arranged in parallel with the loading valve 202 and the pipeline in which it is located, and the ratio of the flow volume of the manual valve 215 and the pipeline in which it is located to the loading valve 202 and the pipeline in which it is located is within a range of 1:8 to 10.

[0109] The parallel arrangement of loading valve 202 and its associated pipeline (relatively, the main pipeline) and manual valve 215 and its associated pipeline (relatively, the bypass, referred to herein as the manual valve 215 bypass or bypass manual valve 215), as well as the aforementioned limited range of flow rate ratios, results in a structure and construction that allows, in this example, when loading valve 202 is open, gas to flow primarily through loading valve 202 to gas compressor 203. When gas compressor 203 is started for loading or shut down for unloading, and loading valve 202 is closed, a trace amount of gas can enter gas compressor 203 through the bypass located by manual valve 215. The provision of bypass manual valve 215 optimizes the loading and unloading performance of the entire device / system, ensures the stability of the startup and shutdown of gas compressor 203, improves device / system stability, optimizes operational efficiency, reduces energy consumption, and extends lifespan.

[0110] At the same time, the bypass structure formed by the manual valve 215 and its pipeline relative to the loading valve 202 and its pipeline allows the device / system of this solution to adjust the opening of the manual valve 215 as needed, which is more conducive to maintaining a stable pressure in the device / system in a flexible, efficient and reliable manner.

[0111] In this example, when the gas compressor 203 is running, the gas outlet shut-off valve 303 is opened; when the gas compressor 203 is shut down, the gas outlet shut-off valve 303 is closed.

[0112] In this embodiment, the loading and unloading time of the gas compressor is very short (15s by default). The purpose of startup loading and shutdown unloading is to protect the pressure stabilization and oil return of the compressor and play a buffering role (that is, slowly starting and slowly shutting down).

[0113] This example also includes:

[0114] Air cooling start and stop; specifically, when the temperature measured by the air cooling temperature transmitter 207 is higher than a first preset air cooling threshold (the first preset air cooling threshold is adjustable, such as set to 40°C), the air cooling fan 206F is turned on; when the temperature measured by the air cooling temperature transmitter 207 is lower than a second preset air cooling threshold (the second preset air cooling threshold is adjustable, such as set to 25°C), the air cooling fan 206F is turned off;

[0115] Oil cooling start and stop; specifically, when the temperature measured by the oil temperature transmitter 213 is higher than a first preset oil cooling threshold (the first preset oil cooling threshold is adjustable, such as set to 60°C), the oil cooling fan 209F is turned on; when the temperature measured by the oil temperature transmitter 213 is lower than a second preset oil cooling threshold (the second preset oil cooling threshold is adjustable, such as set to 50°C), the oil cooling fan 209F is turned off;

[0116] In certain preferred embodiments, this example further includes:

[0117] Interlocking alarm; specifically including: when the pressure measured by the outlet pressure transmitter 208 is higher than the third preset pressure threshold (the third preset pressure threshold is adjustable, such as set to 0.66MPa), interlocking alarm and shutting down the compressor (and shutting down the compressor, that is: shutting down the compressor to stop the compressor operation); when the liquid level measured by the liquid level transmitter 210 is lower than the first preset liquid level threshold (the first preset liquid level threshold is adjustable, such as set to 50mm), interlocking alarm and shutting down the compressor; when the oxygen content measured by the oxygen content detector 103 is higher than the first preset oxygen content threshold (the first preset oxygen content threshold is adjustable, such as set to 5%), open the emergency vent valve 401 for emergency venting, and at the same time interlocking alarm and shutting down the compressor.

[0118] In this example, in the compression and delivery unit 200, the temperature of the gas pressurized by the gas compressor 203 is between 60°C and 80°C, and then cooled to a normal temperature of about 45°C by the air-cooled heat exchanger 206H.

[0119] In this example, in the compression and delivery unit 200 , the first compression and pressurization threshold is set to 0.6 MPa.

[0120] In this example, in the compression and delivery unit 200 , the oil and gas one-way valve 205 is a mechanical one, and its pressure setting value is 0.4 MPa.

[0121] In this example, the gas compressor used is a variable frequency single-screw compressor. Combined with oil injection and exhaust cooling, the exhaust temperature is no higher than 45°C, and the device / system can transport gas safely and reliably at room temperature.

[0122] In this example, the adjustable opening of the first-stage air supply regulating valve 501 is 0-X%; the adjustable opening of the second-stage air supply regulating valve 502 is 0-Y%;

[0123] Specifically, in this example, after the device / system is turned on, the first-level air supply is turned on (during the first-level air supply: the first-level air supply regulating valve 501 is opened, and the second-level air supply regulating valve 502 is closed), and the opening of the first-level air supply regulating valve 501 is adjusted and controlled according to the pressure value measured by the intake pressure transmitter 106, so that the pressure value measured by the intake pressure transmitter 106 is stabilized near the first preset pressure stabilization value (for example, the first preset pressure stabilization value is set to 150 Pa, and the first preset pressure stabilization value is such as 150±5 Pa);

[0124] When the opening feedback of the first-stage air supply regulating valve 501 is greater than the set value of the second-stage air supply regulating valve 502 (that is, when the first-stage air supply is insufficient, or when the opening of the first-stage air supply regulating valve 501 reaches X%), the second-stage air supply regulating valve 502 opens, and the second-stage air supply is started (during the second-stage air supply: both the first-stage air supply regulating valve 501 and the second-stage air supply regulating valve 502 are opened, and the opening of the first-stage air supply regulating valve 501 reaches the maximum value X%);

[0125] When the secondary air supply regulating valve 502 is opened and the secondary air supply is performed, the opening degree of the secondary air supply regulating valve 502 is adjusted and controlled according to the pressure value measured by the intake air pressure transmitter 106, so that the pressure value measured by the intake air pressure transmitter 106 is stabilized near the second preset pressure stabilization value (for example, if the second preset pressure stabilization value is set to 100 Pa, the pressure near the second preset pressure stabilization value is 100±5 Pa);

[0126] When the opening feedback of the first-stage air supply regulating valve 501 is less than the closing set value of the second-stage air supply regulating valve 502, the second-stage air supply regulating valve 502 is closed;

[0127] When the secondary air supply regulating valve 502 is opened, the air supply cut-off valve 503 is opened; when the secondary air supply regulating valve 502 is closed, the air supply cut-off valve 503 is closed.

[0128] In this example, the first preset pressure stabilization value is set to 150 Pa. The value near the first preset pressure stabilization value is 150±5 Pa.

[0129] In this example, the second preset pressure stability value is set to 100 Pa. The area around the second preset pressure stability value is 100±5Pa.

[0130] In this example, the opening setting value of the secondary air supply regulating valve 502 is set to 100Pa.

[0131] In this example, the closing setting value of the secondary air supply regulating valve 502 is set to 150Pa;

[0132] In this example, the set pressure of the oil safety valve 402 is set to 0.72Mpa; the set pressure of the gas safety valve 403 is set to 0.72Mpa. In the event of overpressure, that is, when the pressure of the oil safety valve 402 and / or the gas safety valve 403 exceeds their respective set pressures, the corresponding safety valve will be opened, and the gas will be urgently discharged from the exhaust port of the corresponding safety valve, promptly discharging the excess pressure of the entire compression, conveying and pressurized separation device / system to prevent the entire device / system from continuing to increase pressure, effectively preventing accidents. Of course, in some examples, the set pressure of the oil safety valve 402 can be set to 0.72±0.03Mpa, and the set pressure of the gas safety valve 403 can be set to 0.72±0.03Mpa.

[0133] Specifically, when the pressure of oil safety valve 402 exceeds its set pressure, the oil safety valve 402 is opened, and gas is discharged from the exhaust port of the safety valve, promptly relieving excess pressure from the entire compression and delivery device / compression and delivery system / compression and delivery unit, thereby preventing further pressure increase in the entire device / system and effectively preventing accidents. When the pressure of gas safety valve 403 exceeds its set pressure, the gas safety valve 403 is opened, and gas is discharged from the exhaust port of the safety valve, promptly relieving excess pressure from the entire pressurized separation device / pressurized separation system / pressurized separation unit and effectively preventing accidents.

[0134] In this example, the first preset pressure threshold is adjustable. In this example, the first preset pressure threshold is set to 500 Pa.

[0135] In this example, the second preset pressure threshold is adjustable. In this example, the second preset pressure threshold is set to 200 Pa.

[0136] In this example, the third preset pressure threshold is adjustable. In this example, the third preset pressure threshold is set to 0.66 MPa.

[0137] In this example, the first preset air cooling threshold is adjustable. In this example, the first preset air cooling threshold is set to 40°C.

[0138] In this example, the second preset air cooling threshold is adjustable. In this example, the second preset air cooling threshold is set to 25°C.

[0139] In this example, the first preset oil cooling threshold is adjustable. In this example, the first preset oil cooling threshold is set to 60°C.

[0140] In this example, the second preset oil cooling threshold is adjustable. In this example, the second preset oil cooling threshold is set to 50°C.

[0141] In this example, the first preset liquid level threshold is adjustable. In this example, the first preset liquid level threshold is set to 50 mm.

[0142] In this example, the first preset oxygen content threshold is adjustable. In this example, the first preset oxygen content threshold is set to 5%.

[0143] In this example, in the above-mentioned liquid collection recovery: the liquid separated from the first gas-liquid separation by the air inlet separation tank 104 is passed through the infusion pump 105, and the liquid separated from the second gas-liquid separation by the air outlet separation tank 301 is passed through the outlet discharge valve 304, and then merged and transported together to the designated liquid storage tank.

[0144] In this example, the infusion pump 105 is started and stopped according to the high and low liquid level indications (such as a liquid level sensor) of the air inlet separation tank 104.

[0145] In this example, the outlet liquid discharge valve 304 is started and stopped according to the high and low liquid level indications (such as a liquid level sensor) of the gas outlet separation tank 301 .

[0146] In the present invention, the interlocking control between components, the opening / closing / start / stop of each component, the switching / conversion / adjustment of each operating mode, and the opening / closing or opening adjustment of related valves can be performed manually or automatically through PLC control logic. The automatic switching / control / adjustment herein can be implemented using conventional control logic in the prior art and will not be described in detail. In certain preferred embodiments, various transmitters and / or sensors can be further incorporated to achieve automatic switching / conversion / adjustment of related operating modes.

[0147] The term "connected gas pipelines" as used herein may also be referred to as "connected gas circuits." The term "gas pipeline" as used herein may also be referred to as "gas pipeline." The term "oil pipeline" as used herein may also be referred to as "oil pipeline." The term "interlocking control" as used herein may also be referred to as "interlocking control." The term "inlet / outlet" as used herein may also be referred to as "inlet / outlet" or "inlet / outlet end."

[0148] The large tank vacuuming pressurized separation type compression and conveying device described herein may also be referred to as a pressurized separation type compression and conveying device used for / based on large tank vacuuming. The pressurized separation type compression and conveying device described herein may also be referred to as a pressurized separation type compression and conveying system. The pressurized separation device / system / method for large tank vacuuming described herein may also be referred to as a pressurized separation device / system / method for compression and conveying of large tank vacuuming, or a pressurized separation device / system / method for compression and conveying of large tank vacuuming, or a pressurized separation device / system / method for / based on large tank vacuuming, or a pressurized separation device / system / method for compression and conveying of large tank vacuuming, or a pressurized separation device / system / method for / based on compression and conveying of large tank vacuuming. The " / " described herein represents or.

[0149] The above embodiments do not limit the present invention. Various changes and modifications made by relevant personnel without departing from the technical concept of the present invention are all within the scope of protection of the present invention.

Claims

1. A large tank vacuum pressurization separation type compression and conveying device, characterized by: The invention comprises an air intake separation unit (100), a compression and delivery unit (200) connected to the gas phase pipeline of the air intake separation unit (100), a pressurization separation unit (300) connected to the gas phase pipeline of the compression and delivery unit (200), an emergency air discharge unit (400) connected to the gas phase pipelines of the air intake separation unit (100), the compression and delivery unit (200) and the pressurization separation unit (300), and a two-stage air supply unit (500) connected to the gas phase pipelines of the air intake separation unit (100) and the pressurization separation unit (300).

2. The large tank vacuum pressurization separation type compression and conveying device according to claim 1 is characterized in that: The air intake separation unit (100) comprises an air intake shut-off valve (101), an air intake separation tank (104) connected to the air outlet end of the air intake shut-off valve (101), an inlet discharge valve (107) connected to the liquid outlet end of the air intake separation tank (104), and an infusion pump (105) connected to the outlet end of the inlet discharge valve (107).

3. The large tank vacuum pressurization separation type compression and conveying device according to claim 2 is characterized in that: It also includes an air intake flame arrester (102); the air intake end of the air intake flame arrester (102) is connected to the air outlet end of the air intake shut-off valve (101), and the air outlet end of the air intake flame arrester (102) is connected to the gas inlet of the air intake separation tank (104); The gas inlet of the large tank of the device is connected to the inlet end of the air intake cut-off valve (101); An intake pressure transmitter (106) is provided on a pipeline connecting the large tank exhaust gas inlet and the inlet end of the intake shut-off valve (101); an oxygen content detector (103) is provided on a pipeline connecting the outlet of the intake flame arrester (102) and the gas inlet of the intake separation tank (104).

4. The large tank vacuum pressurization separation type compression and conveying device according to claim 1 is characterized in that: The gas phase pipeline of the compression and delivery unit (200) comprises an air intake filter (201), a loading valve (202) connected to the outlet end of the air intake filter (201), a gas compressor (203) connected to the outlet end of the loading valve (202), an oil-gas separator (204) connected to the outlet end of the gas compressor (203), an oil-gas check valve (205) connected to the first outlet end of the oil-gas separator (204), a reflux cut-off valve (214) connected to the second outlet end of the oil-gas separator (204), and an air-cooled heat exchanger (206H) connected to the outlet end of the oil-gas check valve (205); The other end of the reflux cut-off valve (214) is connected to the inlet end of the loading valve (202).

5. The large tank vacuum pressurization separation type compression and conveying device according to claim 4 is characterized in that: Also included is a hand valve (215); The opening of the hand valve (215) is adjustable; One end of the hand valve (215) is communicated with the inlet end of the loading valve (202), and the other end of the hand valve (215) is communicated with the outlet end of the loading valve (202); The ratio of the flow volume of the hand valve (215) to the flow volume of the loading valve (202) is 1:8-10.

6. The large tank vacuum pressurization separation type compression and conveying device according to claim 4 is characterized in that: The outlet end of the air-cooled heat exchanger (206H) is connected to the inlet end of the air outlet separation tank (301); the inlet end of the air intake filter (201) is connected to the first air outlet end of the air intake separation tank (104); and / or An oil temperature transmitter (213) is provided on the pipeline connecting the outlet of the gas compressor (203) and the inlet of the oil-gas separator (204); an air-cooled temperature transmitter (207) and an outlet air pressure transmitter (208) are provided on the outlet pipeline of the air-cooled heat exchanger (206H); A liquid level transmitter (210) is provided at the liquid storage portion at the lower portion of the oil-gas separator (204).

7. The large tank vacuum pressurization separation type compression and conveying device according to claim 1 is characterized in that: The oil phase pipeline of the compression and delivery unit (200) comprises an oil-gas separator (204), an oil-cooling heat exchanger (209H) connected to the oil outlet end of the oil-gas separator (204), an oil filter (211) connected to the outlet end of the oil-cooling heat exchanger (209H), and an oil shut-off valve (212) connected to the outlet end of the oil filter (211); the other end of the oil shut-off valve (212) is connected to the oil return port of the gas compressor (203).

8. The large tank vacuum pressurization separation type compression and conveying device according to claim 1 is characterized in that: The pressurized separation unit (300) comprises a gas outlet separation tank (301), a gas outlet flame arrester (302) connected to a first gas outlet end of the gas outlet separation tank (301), a gas outlet shut-off valve (303) connected to an outlet end of the gas outlet flame arrester (302), and an outlet liquid discharge valve (304) connected to a liquid outlet end of the gas outlet separation tank (301); The outlet end of the gas outlet shut-off valve (303) is connected to the user-end pipe network; the other end of the outlet liquid discharge valve (304) is communicated with the liquid discharge outlet.

9. The large tank vacuum pressurization separation type compression and conveying device according to claim 1, characterized in that: The emergency discharge unit (400) includes an emergency discharge valve (401), an oil safety valve (402) and a gas safety valve (403); The inlet end of the emergency vent valve (401) is connected to the second outlet end of the air inlet separation tank (104); The inlet end of the oil separation safety valve (402) is connected to the third outlet end of the oil-gas separator (204); The inlet end of the gas separation safety valve (403) is connected to the second gas outlet end of the gas outlet separation tank (301); The outlet of the emergency vent valve (401), the outlet of the oil safety valve (402) and the outlet of the gas safety valve (403) are all connected to the emergency discharge pipe.

10. The large tank vacuum pressurization separation type compression and conveying device according to claim 1, characterized in that: The two-stage air supply unit (500) comprises a first-stage air supply regulating valve (501), a second-stage air supply regulating valve (502), and an air supply cut-off valve (503) connected to the inlet end of the second-stage air supply regulating valve (502); The inlet end of the gas supply cut-off valve (503) is connected to the natural gas pipeline; The outlet end of the secondary air supply regulating valve (502) is connected to the inlet end of the air intake cut-off valve (101); The outlet end of the first-stage air supply regulating valve (501) is connected to the inlet end of the air intake cut-off valve (101); The inlet end of the first-stage air supply regulating valve (501) is connected to the third air outlet end of the air outlet separation tank (301).

11. The large tank vacuum pressurization separation type compression and conveying device according to claim 10, characterized in that: The first-stage air supply regulating valve (501) and the second-stage air supply regulating valve (502) are both interlockedly controlled with an air intake pressure transmitter (106) provided on a pipeline connected to the inlet end of the air intake shut-off valve (101).

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