Oil and gas recovery unit combining condensation, thermal desorption, and vacuum desorption

Abstract

This invention relates to the technical field of oil and gas recovery, and discloses an oil and gas recovery device that combines condensation, thermal desorption, and vacuum desorption. It includes a condensation module, an adsorption regeneration module, and an intelligent control module. The adsorption regeneration module comprises an adsorption tank, a vacuum pump, and a thermal desorption unit. The condensation module is connected to the adsorption tank via a condensation pipeline, the adsorption tank is connected to the vacuum pump via a recovery pipeline, and the vacuum pump is connected to the condensation module via a recovery pipeline. The thermal desorption unit is connected to the adsorption tank via a heating pipeline. Through the coordinated operation of the condensation module, adsorption regeneration module, and intelligent control module, efficient oil and gas recovery is achieved. The condensation module sequentially cools and separates liquid hydrocarbons, the adsorption regeneration module regenerates the adsorbent using vacuum desorption and thermal desorption technologies, and the intelligent control module dynamically adjusts the condensation temperature, vacuum level, and heating parameters to ensure efficient and stable system operation. The overall structural design significantly improves oil and gas recovery efficiency while avoiding the limitations of traditional single-condensation methods.

Description

Technical Field

[0001] This invention relates to the technical field of oil and gas recovery, and more specifically, to an oil and gas recovery device that combines condensation and thermal desorption with vacuum desorption. Background Technology

[0002] Traditional oil and gas recovery technologies mainly rely on single condensation or adsorption methods, which have the following drawbacks:

[0003] Low condensation efficiency: Single-stage condensation is difficult to achieve efficient capture of low-boiling-point hydrocarbons (such as C3-C6 components), requires a large amount of energy to maintain a low-temperature environment below -70°C, and has a high risk of ice blockage.

[0004] Incomplete adsorbent regeneration: Conventional thermal desorption requires high-temperature heating of the adsorption bed, which can easily lead to adsorbent sintering and deactivation, while simple vacuum desorption is insufficient for the desorption rate of high-boiling-point components. Summary of the Invention

[0005] The purpose of this invention is to provide an oil and gas recovery device that combines condensation, thermal desorption, and vacuum desorption, aiming to solve the problem that the existing oil and gas recovery technology is relatively simple.

[0006] This invention is implemented as follows: an oil and gas recovery device that combines condensation, thermal desorption, and vacuum desorption includes a condensation module, an adsorption regeneration module, and an intelligent control module. The intelligent control module is electrically connected to both the condensation module and the adsorption regeneration module, and is used to dynamically adjust the condensation temperature, vacuum level, and heating parameters. The condensation module is connected to the adsorption regeneration module and consists of three condensers connected in series, which progressively lower the oil and gas temperature from room temperature to -70°C, separating liquid hydrocarbons.

[0007] The adsorption regeneration module includes an adsorption tank, a vacuum pump, and a thermal desorption unit. The adsorption tank has a built-in layer of activated carbon, resin, or MOFs adsorbent. The condensation module is connected to the adsorption tank through a condensation pipeline. The adsorption tank is connected to the vacuum pump through a recovery pipeline. The vacuum pump provides a vacuum of -90 kPa to -98 kPa to the adsorption tank. The vacuum pump is connected to the condensation module through a recovery pipeline. The condensation module, the adsorption tank, and the vacuum pump are sequentially interconnected to form a circulation pipeline. The thermal desorption unit is connected to the adsorption tank through a heating pipeline.

[0008] Furthermore, the refrigerants in the three-stage condenser are respectively:

[0009] The first-stage condenser uses an aqueous solution of ethylene glycol at a temperature of 0℃±2℃.

[0010] The second-stage condenser uses a Freon refrigeration unit with a temperature of -25℃±3℃.

[0011] The third-stage condenser uses a cascade refrigeration system with a temperature range of -70℃±5℃.

[0012] Furthermore, the adsorption tank and the condensation module are connected via a gas-liquid separator. The outlet gas of the gas-liquid separator is fed into the adsorption tank, and the outlet liquid of the gas-liquid separator is fed into the oil storage tank.

[0013] Furthermore, the adsorption tank includes a first adsorption tank and a second adsorption tank arranged in parallel.

[0014] Furthermore, the thermal desorption unit integrates a steam heat exchanger or a hot nitrogen circulation device for heating the adsorbent to 120-180°C.

[0015] Furthermore, a pressure sensor is installed on the recovery pipeline to monitor the vacuum level provided by the vacuum pump.

[0016] Furthermore, the intelligent control module includes a distributed temperature sensor group, a VOCs concentration sensor group, and a PLC controller.

[0017] The distributed temperature sensor group collects the outlet temperature of each condensation stage and the temperature distribution inside the adsorption tank in real time.

[0018] The VOCs concentration sensor group monitors the concentration difference between the inlet and outlet oil and gas in real time, and dynamically adjusts the vacuum pump speed through a PID algorithm to keep the adsorption efficiency stable at over 92%.

[0019] The PLC controller is equipped with a collaborative control unit, which dynamically optimizes the working mode of the condensation stage and the switching sequence of the adsorption tank according to the concentration of oil and gas at the inlet, and establishes a predictive model for adsorbent regeneration demand.

[0020] Furthermore, the collaborative control unit implements the following control strategy:

[0021] When the inlet oil and gas concentration is >300 g / m³ 3 At this time, start the three-stage condenser and shorten the adsorption tank switching cycle to 30-45 minutes;

[0022] When a temperature gradient of >15℃ is detected in the adsorbent layer, a local enhanced regeneration mode is triggered, increasing the nitrogen flow rate in the corresponding area by 20-30%.

[0023] An adsorbent performance degradation model was established based on historical data, and the regeneration temperature curve was dynamically adjusted to maintain the desorption efficiency >92%.

[0024] Furthermore, the top of the adsorption tank is provided with a tank cover, the adsorption tank has a longitudinally arranged inner cavity, a longitudinally arranged rotating shaft is installed in the inner cavity, the rotating shaft is rotatably connected to the adsorption tank, a sleeve is sleeved on the rotating shaft, the sleeve is detachably connected to the rotating shaft, and a lifting ring is circumferentially protruding from the top of the sleeve.

[0025] The sleeve is provided with multiple airflow distribution disks, which are arranged sequentially at intervals along the axial direction of the sleeve. Each airflow distribution disk is provided with multiple hollow frames filled with the adsorbent. The hollow frames are slidably engaged with the airflow distribution disks and are interconnected. The multiple hollow frames are arranged sequentially adjacent to each other along the circumference of the sleeve to form a disc-shaped structure. The outer periphery of the disc-shaped structure is fitted with an enclosing strip. There is an adsorption interval between horizontally adjacent hollow frames and a flow guiding interval between vertically adjacent hollow frames.

[0026] Multiple longitudinally arranged fixing strips are welded to the inner wall of the cavity. The multiple fixing strips are arranged at intervals around the circumference of the cavity. The fixing strips are provided with guide slides, and the guide slides are slidably engaged with the fixing strips.

[0027] The guide slide has multiple recessed grooves, which are arranged at intervals along the length of the guide slide. One side of the enclosing strip is embedded in the groove.

[0028] Furthermore, the rotating shaft is connected to the adsorption tank via a bearing, and a track bar protrudes from the outer side of the rotating shaft. The track bar extends along the length of the rotating shaft. The sleeve has a hollow cavity, and the inner wall of the hollow cavity is recessed to form a track groove that matches the shape of the track bar. The sleeve slides with the track bar of the rotating shaft through the track groove.

[0029] The notch is provided with rolling beads on the upper and lower sides, and the enclosing strip is recessed on the upper and lower sides to form sliding grooves, and the rolling beads move and abut against the sliding grooves of the enclosing strip.

[0030] Compared with existing technologies ， The oil and gas recovery device provided by this invention, which combines condensation, thermal desorption, and vacuum desorption, achieves efficient oil and gas recovery through the coordinated operation of a condensation module, an adsorption regeneration module, and an intelligent control module. The condensation module sequentially cools and separates liquid hydrocarbons, the adsorption regeneration module regenerates the adsorbent using vacuum desorption and thermal desorption technologies, and the intelligent control module dynamically adjusts the condensation temperature, vacuum level, and heating parameters to ensure efficient and stable system operation. The overall structural design can significantly improve oil and gas recovery efficiency, reduce energy consumption, and lower equipment operating costs, while avoiding the shortcomings of traditional single condensation or adsorption processes. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the structural layout of the oil and gas recovery device that combines condensation, thermal desorption, and vacuum desorption provided by the present invention.

[0032] Figure 2 This is a frontal sectional view of the adsorption tank provided by the present invention;

[0033] Figure 3 This is the present invention. Figure 2 A magnified structural diagram of A in the middle;

[0034] Figure 4 This is a top view cross-sectional structural diagram of the adsorption tank provided by the present invention.

[0035] In the diagram: condensation module 10, adsorption regeneration module 20, intelligent control module 30, condensation pipeline 40, recovery pipeline 50, heating pipeline 60, first-stage condenser 11, second-stage condenser 12, third-stage condenser 13, adsorption tank 21, vacuum pump 22, steam heat exchanger 23, gas-liquid separator 24, oil storage tank 25, tank cover 211, inner cavity 212, rotating shaft 213, sleeve 214, fixing strip 215, guide slide 216, drive mechanism 217, track strip 2131, outer section 2132, lifting ring 2141, airflow distribution plate 2142, hollow frame 2143, enclosure strip 2144, notch groove 2161, rolling ball 2162, distributed temperature sensor group 31, PLC controller 32. Detailed Implementation

[0036] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0037] The implementation of the present invention will be described in detail below with reference to specific embodiments.

[0038] In the accompanying drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components. In the description of this invention, it should be understood that if terms such as "upper," "lower," "left," and "right" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, they are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the terms used to describe positional relationships in the drawings are only for illustrative purposes and should not be construed as limiting this invention. For those skilled in the art, the specific meaning of the above terms can be understood according to the specific circumstances.

[0039] Reference Figure 1-4 The image shows a preferred embodiment of the present invention.

[0040] An oil and gas recovery device that combines condensation, thermal desorption, and vacuum desorption includes a condensation module 10, an adsorption regeneration module 20, and an intelligent control module 30. The intelligent control module 30 is electrically connected to the condensation module 10 and the adsorption regeneration module 20, respectively, and is used to dynamically adjust the condensation temperature, vacuum degree, and heating parameters. The condensation module 10 is connected to the adsorption regeneration module 20 and consists of three condensers connected in series, which gradually reduce the oil and gas temperature from room temperature to -70°C to separate liquid hydrocarbons.

[0041] The adsorption regeneration module 20 includes an adsorption tank 21, a vacuum pump 22, and a thermal desorption unit. The adsorption tank 21 has a built-in layer of activated carbon, resin, or MOFs adsorbent. The condensation module 10 is connected to the adsorption tank 21 through a condensation pipe 40. The adsorption tank 21 is connected to the vacuum pump 22 through a recovery pipe 50. The vacuum pump 22 provides a vacuum of -90 kPa to -98 kPa to the adsorption tank 21. The vacuum pump 22 is connected to the condensation module 10 through the recovery pipe 50. The condensation module 10, the adsorption tank 21, and the vacuum pump 22 are interconnected to form a circulation pipeline. The thermal desorption unit is connected to the adsorption tank 21 through a heating pipe 60.

[0042] The oil and gas recovery device provided above, which combines condensation, thermal desorption, and vacuum desorption, achieves efficient oil and gas recovery through the coordinated operation of the condensation module 10, the adsorption regeneration module 20, and the intelligent control module 30. The condensation module 10 sequentially cools and separates liquid hydrocarbons, the adsorption regeneration module 20 regenerates the adsorbent using vacuum desorption and thermal desorption technologies, and the intelligent control module 30 dynamically adjusts the condensation temperature, vacuum degree, and heating parameters to ensure efficient and stable system operation. The overall structural design can significantly improve oil and gas recovery efficiency, reduce energy consumption, and lower equipment operating costs, while avoiding the shortcomings of traditional single condensation or adsorption processes.

[0043] Three-stage condensation depth pretreatment:

[0044] Hydrocarbons from C5+ to C3+ are separated step by step by a three-stage gradient cooling process (0℃→-25℃→-70℃).

[0045] Synergistic regeneration of thermal desorption and vacuum desorption:

[0046] The integrated vacuum pump 22 desorption (-90kPa to -98kPa) and thermal desorption unit (120-180℃) achieve deep regeneration of the adsorbent within the same adsorption tank 21;

[0047] Vacuum desorption preferentially removes low-boiling-point hydrocarbons, while thermal desorption further removes high-boiling-point hydrocarbons, significantly improving regeneration efficiency and adsorbent lifespan.

[0048] Intelligent control and optimized operation: The system automatically selects the condensation stage based on the inlet oil and gas concentration (PID feedback) and triggers the regeneration program according to the adsorbent saturation; it prioritizes vacuum desorption and initiates thermal desorption when necessary, thereby achieving intelligent and efficient system operation.

[0049] Closed-loop system design: The desorbed oil and gas return condensation module 10 cycles through processing, avoiding the secondary pollution problem caused by direct discharge of desorbed gas in traditional units, and achieving full recovery of hydrocarbons.

[0050] Condensation module 10 efficiency: inlet oil and gas concentration 3 x 10⁵ mg / m³ 3 At that time, it dropped to 30000 mg / m³ after condensation. 3 (Recovery rate 90%)

[0051] Adsorption-regeneration synergy: NMHC final emissions <50 mg / m³ 3 (Measured data from Zhongmei Moye Chemical Plant);

[0052] Energy optimization: Intelligent allocation reduces overall energy consumption by 35% (compared to traditional fixed-stage condensing units);

[0053] Extended adsorbent lifespan: The adsorbent lifespan is increased by more than 50% compared to traditional devices;

[0054] Environmental benefits: It enables the complete recovery of hydrocarbons, avoids secondary pollution, and meets high emission standards.

[0055] In this embodiment, the refrigerants for the three-stage condenser are as follows:

[0056] The first-stage condenser 11 uses an aqueous solution of ethylene glycol at a temperature of 0℃±2℃.

[0057] The second-stage condenser 12 uses a Freon refrigeration unit with a temperature of -25℃±3℃;

[0058] The third-stage condenser 13 adopts a cascade refrigeration system with a temperature of -70℃±5℃.

[0059] The three-stage condenser employs ethylene glycol aqueous solution, Freon refrigeration unit, and cascade refrigeration system respectively, with temperature control at 0℃±2℃, -25℃±3℃, and -70℃±5℃, enabling efficient condensation in each stage. This staged condensation design not only improves condensation efficiency but also avoids frosting problems caused by sudden temperature drops, extending equipment lifespan and reducing energy consumption. By optimizing refrigerant selection and temperature control, it can better adapt to the oil-gas condensation requirements under different operating conditions.

[0060] In this embodiment, the adsorption tank 21 and the condensation module 10 are connected by a gas-liquid separator 24. The outlet gas of the gas-liquid separator 24 is connected to the adsorption tank 21, and the outlet liquid of the gas-liquid separator 24 is connected to the oil storage tank 25.

[0061] Adding a gas-liquid separator 24 between the condensation module 10 and the adsorption tank 21 can effectively separate the condensed liquid hydrocarbons and gases, preventing liquid hydrocarbons from entering the adsorption tank 21 and causing the adsorbent to become damp or ineffective. The separated liquid hydrocarbons enter the oil storage tank 25, and the gas enters the adsorption tank 21, which improves the adsorption efficiency and the stability of the system operation, while avoiding resource waste.

[0062] In this embodiment, the adsorption tank 21 includes a first adsorption tank and a second adsorption tank arranged in parallel.

[0063] The adsorption tank 21 adopts a first adsorption tank and a second adsorption tank arranged in parallel, which can realize the alternating operation of adsorption and regeneration processes, improve the continuity and processing capacity of the system; when one adsorption tank is in the adsorption state, the other adsorption tank can be regenerated, avoiding system shutdown due to adsorbent saturation, and significantly improving oil and gas treatment efficiency and system operation reliability.

[0064] In this embodiment, the thermal desorption unit integrates a steam heat exchanger 23 or a hot nitrogen circulation device to heat the adsorbent to 120-180°C.

[0065] The thermal desorption unit integrates a steam heat exchanger 23 or a hot nitrogen circulation device, which can heat the adsorbent to 120-180℃ to achieve efficient thermal desorption. This design can not only quickly desorb the adsorbed oil and gas, but also extend the service life of the adsorbent, while avoiding the problem of incomplete desorption caused by insufficient heating, thus significantly improving the oil and gas recovery efficiency.

[0066] In this embodiment, a pressure sensor is provided on the recovery pipeline 50 to monitor the vacuum level provided by the vacuum pump 22.

[0067] A pressure sensor is installed on the recovery pipeline 50 to monitor the vacuum level provided by the vacuum pump 22 in real time, ensuring that the vacuum level inside the adsorption tank 21 is maintained within the range of -90kPa to -98kPa. By dynamically adjusting the speed of the vacuum pump 22, problems such as decreased adsorption efficiency or equipment damage caused by excessively high or low vacuum can be avoided, thereby improving the stability and reliability of the system operation.

[0068] In this embodiment, the intelligent control module 30 includes a distributed temperature sensor group 31, a VOCs concentration sensor group, and a PLC controller 32.

[0069] The distributed temperature sensor group 31 collects the outlet temperature of each condensation stage and the temperature distribution inside the adsorption tank 21 in real time.

[0070] The VOCs concentration sensor group monitors the concentration difference of oil and gas at the inlet and outlet in real time, and dynamically adjusts the speed of the vacuum pump 22 through the PID algorithm to keep the adsorption efficiency stable at over 92%.

[0071] The PLC controller 32 is equipped with a collaborative control unit. The collaborative control unit dynamically optimizes the working mode of the condenser stage and the switching sequence of the adsorption tank according to the concentration of oil and gas at the inlet, and establishes a predictive model for adsorbent regeneration demand.

[0072] The intelligent control module 30 collects the condenser stage outlet temperature and the temperature distribution inside the adsorption tank 21 in real time through the distributed temperature sensor group 31, monitors the oil-gas concentration difference through the VOCs concentration sensor group, and dynamically adjusts the speed of the vacuum pump 22 in conjunction with the PID algorithm to keep the adsorption efficiency stable at over 92%. The collaborative control unit in the PLC controller 32 can optimize the condenser stage working mode and the adsorption tank switching sequence, dynamically adjust the regeneration temperature curve, significantly improve the system operating efficiency and oil-gas recovery rate, and extend the adsorbent life.

[0073] In this embodiment, the collaborative control unit implements the following control strategy:

[0074] When the inlet oil and gas concentration is >300 g / m³ 3 At this time, start the three-stage condenser and shorten the adsorption tank switching cycle to 30-45 minutes;

[0075] When a temperature gradient of >15℃ is detected in the adsorbent layer, a local enhanced regeneration mode is triggered, increasing the nitrogen flow rate in the corresponding area by 20-30%.

[0076] An adsorbent performance degradation model was established based on historical data, and the regeneration temperature curve was dynamically adjusted to maintain the desorption efficiency >92%.

[0077] The collaborative control unit dynamically adjusts the system operating mode based on the inlet oil and gas concentration. For example, when the inlet oil and gas concentration exceeds 300 g / m³, the system will adjust the mode accordingly. 3 When the adsorbent layer temperature gradient exceeds 15°C, a local enhanced regeneration mode is triggered, increasing the nitrogen flow rate in the corresponding area by 20-30% to prevent the adsorbent from overheating or failing. Based on historical data, an adsorbent performance degradation model is established, and the regeneration temperature curve is dynamically adjusted to ensure that the desorption efficiency is maintained above 92%, significantly improving the stability and efficiency of the system operation.

[0078] In this embodiment, the top of the adsorption tank 21 is provided with a tank cover 211, the adsorption tank 21 has a longitudinally arranged inner cavity 212, a longitudinally arranged rotating shaft 213 is installed in the inner cavity 212, the rotating shaft 213 is rotatably connected to the adsorption tank 21, a sleeve 214 is sleeved on the rotating shaft 213, the sleeve 214 is detachably connected to the rotating shaft 213, and a lifting ring 2141 is circumferentially protruding from the top of the sleeve 214;

[0079] The sleeve 214 is provided with multiple airflow distribution disks 2142, which are arranged sequentially at intervals along the axial direction of the sleeve 214. Multiple hollow frames 2143 filled with adsorbent are provided on the airflow distribution disks 2142. The hollow frames 2143 are slidably engaged with the airflow distribution disks 2142 and are interconnected. The multiple hollow frames 2143 are arranged sequentially adjacent to each other along the circumference of the sleeve 214 to form a disc-shaped structure. A surrounding strip 2144 is fitted around the outer periphery of the disc-shaped structure. There are adsorption gaps between horizontally adjacent hollow frames 2143 and flow guiding gaps between vertically adjacent hollow frames 2143.

[0080] Multiple longitudinally arranged fixing strips 215 are welded on the inner wall of the inner cavity 212. The multiple fixing strips 215 are arranged at intervals around the circumference of the inner cavity 212. The fixing strips 215 are provided with guide slides 216, and the guide slides 216 slide in cooperation with the fixing strips 215.

[0081] The guide slide 216 has multiple recessed grooves 2161, which are arranged sequentially at intervals along the length of the guide slide 216. One side of the enclosing strip 2144 is embedded in the groove 2161.

[0082] Uniform airflow distribution: The rotating shaft 213 drives the airflow distribution disk 2142 to rotate, so that the gas flows evenly in the adsorbent layer and eliminates "dead zones"; the multi-layer hollow frame 2143 forms a honeycomb flow channel, and the airflow distribution uniformity index is ≥0.95, avoiding local adsorbent failure caused by "channeling effect".

[0083] Modular filling: The lifting ring 2141 is designed to support rapid lifting by crane, and the time for a single adsorbent replacement is ≤2 hours (8 hours for traditional structures); the hollow frame 2143 and the enclosure strip 2144 slide together to facilitate rapid filling, replacement and maintenance of the adsorbent.

[0084] Structural stability: The enclosing strip 2144 is embedded in the notch 2161 to form a mechanical interlock, which improves the vibration and displacement resistance and is suitable for high vibration scenarios such as offshore platforms; the fixing strip 215 and the guide slide 216 restrict the displacement of the hollow frame 2143 to prevent the structure from becoming loose or the absorbent from leaking during rotation.

[0085] In this embodiment, the rotating shaft 213 is connected to the adsorption tank 21 by a bearing. The outer side of the rotating shaft 213 is provided with a track bar 2131, which extends along the length of the rotating shaft 213. The sleeve 214 has a hollow cavity, and the inner sidewall of the hollow cavity is recessed to form a track groove that matches the shape of the track bar 2131. The sleeve 214 slides with the track bar 2131 of the rotating shaft 213 through the track groove.

[0086] The bottom of the rotating shaft 213 extends through the bottom of the adsorption tank 21 to the outside of the adsorption tank 21 to form an outer section 2132. A gear disk is welded on the outer section 2132. The gear disk meshes with the drive mechanism 217 to realize the rotation drive of the rotating shaft 213.

[0087] The notch 2161 has rolling balls 2162 on the upper and lower sides respectively, and the enclosing strip 2144 has grooves formed by recesses on the upper and lower sides respectively, and the rolling balls 2162 move and abut against the grooves of the enclosing strip 2144.

[0088] The bearing and track bar 2131 structure: The bearing connection reduces rotational friction resistance, and the track groove and track bar 2131 cooperate to achieve precise transmission and extend the equipment life.

[0089] Smooth transmission: The external drive mechanism 217 controls the speed through a gear disk to adapt to the desorption requirements of different working conditions; the gear drive provides stable torque to ensure that the airflow distribution disk 2142 rotates at a uniform speed, reducing vibration and noise.

[0090] Low-resistance operation: The rolling ball 2162 cooperates with the slide groove to reduce sliding friction and extend the service life of the rotating mechanism; quick maintenance: The sleeve 214 and the rotating shaft 213 are detachably connected, which facilitates disassembly, cleaning or replacement of damaged parts; the synergistic design of the system comprehensively improves the adsorbent regeneration efficiency while reducing energy consumption and maintenance costs.

[0091] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An oil and gas recovery device that combines condensation, thermal desorption, and vacuum desorption, characterized in that, It includes a condensation module, an adsorption-regeneration module, and an intelligent control module. The intelligent control module is electrically connected to the condensation module and the adsorption-regeneration module respectively, and is used to dynamically adjust the condensation temperature, vacuum degree, and heating parameters. The condensation module is connected to the adsorption-regeneration module and consists of three-stage condensers connected in series, which gradually reduces the oil and gas temperature from room temperature to -70°C to separate liquid hydrocarbons. The adsorption regeneration module includes an adsorption tank, a vacuum pump, and a thermal desorption unit. The adsorption tank has a built-in layer of activated carbon, resin, or MOFs adsorbent. The condensation module is connected to the adsorption tank via a condensation pipeline. The adsorption tank is connected to the vacuum pump via a recovery pipeline, and the vacuum pump provides a vacuum of -90 kPa to -98 kPa to the adsorption tank. The vacuum pump is connected to the condensation module via a recovery pipeline. The condensation module, adsorption tank, and vacuum pump are sequentially interconnected to form a circulation pipeline. The thermal desorption unit is connected to the adsorption tank via a heating pipeline. The intelligent control module includes a distributed temperature sensor group, a VOCs concentration sensor group, and a PLC controller. The distributed temperature sensor group collects the outlet temperature of each condensation stage and the temperature distribution inside the adsorption tank in real time. The VOCs concentration sensor group monitors the concentration difference between the inlet and outlet oil and gas in real time, and dynamically adjusts the vacuum pump speed through a PID algorithm to keep the adsorption efficiency stable at over 92%. The PLC controller is equipped with a collaborative control unit, which dynamically optimizes the working mode of the condenser stage and the switching sequence of the adsorption tank according to the oil and gas inlet concentration, and establishes a predictive model for adsorbent regeneration demand. The collaborative control unit implements the following control strategy: When the inlet oil and gas concentration is >300g / m³, start the three-stage condenser and shorten the adsorption tank switching cycle to 30-45 minutes; When a temperature gradient >15℃ is detected in the adsorbent layer, a local enhanced regeneration mode is triggered, increasing the nitrogen flow rate in the corresponding area by 20-30%. An adsorbent performance degradation model was established based on historical data, and the regeneration temperature curve was dynamically adjusted to maintain the desorption efficiency >92%. The top of the adsorption tank is provided with a tank cover. The adsorption tank has a longitudinally arranged inner cavity. A longitudinally arranged rotating shaft is installed in the inner cavity. The rotating shaft is rotatably connected to the adsorption tank. A sleeve is fitted on the rotating shaft. The sleeve is detachably connected to the rotating shaft. A lifting ring is circumferentially protruding from the top of the sleeve. The sleeve is provided with multiple airflow distribution disks, which are arranged sequentially at intervals along the axial direction of the sleeve. Each airflow distribution disk is provided with multiple hollow frames filled with the adsorbent. The hollow frames are slidably engaged with the airflow distribution disks and are interconnected. The multiple hollow frames are arranged sequentially adjacent to each other along the circumference of the sleeve to form a disc-shaped structure. The outer periphery of the disc-shaped structure is fitted with an enclosing strip. There is an adsorption interval between horizontally adjacent hollow frames and a flow guiding interval between vertically adjacent hollow frames. Multiple longitudinally arranged fixing strips are welded to the inner wall of the cavity. The multiple fixing strips are arranged at intervals around the circumference of the cavity. The fixing strips are provided with guide slides, and the guide slides are slidably engaged with the fixing strips. The guide slide has multiple recessed grooves, which are arranged at intervals along the length of the guide slide. One side of the enclosing strip is embedded in the groove.

2. The oil and gas recovery device with synergistic condensation, thermal desorption, and vacuum desorption as described in claim 1, characterized in that, The refrigerants in the three-stage condenser are: The first-stage condenser uses an aqueous solution of ethylene glycol at a temperature of 0℃±2℃. The second-stage condenser uses a Freon refrigeration unit with a temperature of -25℃±3℃. The third-stage condenser uses a cascade refrigeration system with a temperature range of -70℃±5℃.

3. The oil and gas recovery device with synergistic condensation, thermal desorption, and vacuum desorption as described in claim 2, characterized in that, The adsorption tank and the condensation module are connected by a gas-liquid separator. The outlet gas of the gas-liquid separator is connected to the adsorption tank, and the outlet liquid of the gas-liquid separator is connected to the oil storage tank.

4. The oil and gas recovery device with synergistic condensation, thermal desorption, and vacuum desorption as described in claim 1, characterized in that, The adsorption tank includes a first adsorption tank and a second adsorption tank arranged in parallel.

5. The oil and gas recovery device with synergistic condensation, thermal desorption, and vacuum desorption as described in claim 4, characterized in that, The thermal desorption unit integrates a steam heat exchanger or a hot nitrogen circulation device to heat the adsorbent to 120-180°C.

6. The oil and gas recovery device with synergistic condensation, thermal desorption, and vacuum desorption as described in claim 5, characterized in that, The recovery pipeline is equipped with a pressure sensor to monitor the vacuum level provided by the vacuum pump.

7. The oil and gas recovery device with synergistic condensation, thermal desorption, and vacuum desorption as described in any one of claims 1 to 6, characterized in that, The rotating shaft is connected to the adsorption tank by a bearing. A track bar protrudes from the outer side of the rotating shaft and extends along the length of the rotating shaft. The sleeve has a hollow cavity, and the inner sidewall of the hollow cavity is recessed to form a track groove that matches the shape of the track bar. The sleeve slides with the track bar of the rotating shaft through the track groove. The notch is provided with rolling beads on the upper and lower sides, and the enclosing strip is recessed on the upper and lower sides to form sliding grooves, and the rolling beads move and abut against the sliding grooves of the enclosing strip.

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