Oilfield tail gas VOCs (Volatile Organic Compounds) removal device

Abstract

The invention relates to the technical field of oil field tail gas VOCs removal, and discloses an oil field tail gas VOCs removal device which comprises a rotating ring, a zeolite disc is arranged in the rotating ring, a cutting device is arranged on the outer wall of the zeolite disc, and the middle of the zeolite disc is fixedly connected to the outer wall of the middle of a first transmission shaft; a first limiting block is fixedly connected to one end of the first transmission shaft, a motor is arranged in front of the rotating ring, the outer wall of the motor is fixedly connected to the inner wall of the second flow guide cover, a second transmission shaft is fixedly arranged at the output end of the motor, and a second limiting block is fixedly connected to the end, away from the motor, of the second transmission shaft; and the second limiting block is connected with the first transmission shaft through a transmission belt. According to the oil field tail gas VOCs removal device, rotating force can be output through the motor, then the transmission belt is driven to rotate, and therefore the problem that when traditional oil field tail gas VOCs are removed, the pressure of gas input into removal equipment is small, and consequently the removal efficiency is not high is solved.

Description

Technical Field

[0001] The invention relates to the technical field of VOCs removal from oilfield tail gas, in particular to a VOCs removal device for oilfield tail gas. Background Art

[0002] Volatile organic compounds (VOCs) in oilfield tail gas are a general term for organic compounds that have high vapor pressure and are volatile at normal temperature and pressure. In all aspects of oilfield production, from the gas escaping from oil wells during crude oil extraction to the gathering, transportation, storage and processing of crude oil, a large amount of tail gas containing VOCs will be produced. Its composition is quite complex, covering a variety of alkanes such as methane and ethane, olefins such as ethylene and propylene, as well as aromatic substances and a small amount of sulfur-containing and nitrogen-containing organic compounds. These VOCs have many characteristics and effects: on the one hand, most of them are flammable, and some of them are prone to explosion hazards when exposed to open flames when the concentration is high, which brings challenges to the safe production of oilfields; on the other hand, from an environmental perspective, VOCs emitted into the atmosphere are important precursors of photochemical smog and fine particulate matter (PM2.5) pollution, and will participate in a series of complex atmospheric photochemical reactions, leading to increased ozone concentrations, reduced air quality, harm to the health of the human respiratory system, and may also inhibit the growth of surrounding vegetation. Effective control of VOCs in oilfield exhaust gas, whether through source reduction to optimize production processes or end-of-pipe treatment using removal technologies such as adsorption, combustion, and absorption, is of great significance for ensuring the safety of oilfield operations, protecting the ecological environment, and implementing sustainable development strategies.

[0003] In traditional oilfield tail gas VOCs removal, the gas input to the removal equipment is mostly discharged freely from the gas generating equipment, which may result in a lower gas pressure input to the removal equipment, thus causing the removal efficiency to be low. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides an oilfield tail gas VOCs removal device, which solves the problem that in traditional oilfield tail gas VOCs removal, the gas input to the removal equipment is mostly freely discharged from the gas generating equipment, which may make the gas pressure input to the removal equipment lower, thereby causing the removal efficiency to be low.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: an oilfield tail gas VOCs removal device, comprising a rotating ring, a zeolite disk is arranged inside the rotating ring, a dividing device is arranged on the outer wall of the zeolite disk, the middle part of the zeolite disk is fixedly connected to the middle outer wall of the first transmission shaft, one end of the first transmission shaft is fixedly connected to the first limit block, a motor is arranged in front of the rotating ring, the outer wall of the motor is fixedly connected to the inner wall of the second air guide cover, the output end of the motor is fixedly provided with a second transmission shaft, the end of the second transmission shaft away from the motor is fixedly connected to the second limit block, the second limit block is connected to the first transmission shaft through a transmission belt, the end of the first transmission shaft away from the first limit block is fixedly provided at the input end of the transmission, the output end of the transmission is fixedly provided at the outer wall of the fan shaft, the outer wall of the fan shaft is fixedly connected with fan blades, the outer wall of the transmission is fixedly connected to one end of the support rod, and the other end of the support rod is fixedly connected to the inner wall of the shell.

[0006] Preferably, the dividing device comprises a sealing plate, and the outer wall of the sealing plate is fixedly connected to the outer wall of the zeolite disk.

[0007] Preferably, a first air guide cover is fixedly connected to one side of the swivel close to the shell, and a high-efficiency filter plate, a medium-efficiency filter plate and a coarse-efficiency filter plate are provided at one end of the first air guide cover away from the swivel.

[0008] Preferably, a first sealed chamber and a second sealed chamber are provided on both sides of the upper part of the swivel, the top of the second sealed chamber is fixedly connected to one end of the second gas pipe, the other end of the second gas pipe is fixedly connected to the top of the heat exchanger, the top of the first sealed chamber is fixedly connected to one end of the first gas pipe, and the other end of the first gas pipe is fixedly connected to the input end of the ROT device.

[0009] Preferably, the output end of the ROT device is fixedly connected to an exhaust pipe.

[0010] Preferably, the upper and lower ends of the heat exchanger are fixedly connected to the inner wall of the second air guide cover.

[0011] Preferably, an annular groove is provided on the inner wall of the rotating ring, and the zeolite disk is arranged inside the annular groove.

[0012] Preferably, the bottom of the swivel is fixedly connected to a first support frame, and the bottom of the second air guide cover is fixedly connected to a second support frame on a side away from the swivel.

[0013] Working principle: The oil and gas are transported to the front of the coarse filter plate, the motor is started and then the first transmission shaft is driven to rotate by the transmission belt, so that the zeolite disc rotates slowly, and the slow rotation power of the first transmission shaft is converted into high-speed rotation power through the transmission and output to the fan shaft, so that the fan blades rotate quickly, thereby sucking the oil and gas from the front of the coarse filter plate, filtering the larger particles in the oil and gas through the coarse filter plate, and then filtering the medium-diameter particle impurities in the oil and gas through the medium-efficiency filter plate, and filtering the smaller-diameter particle impurities in the oil and gas through the high-efficiency filter plate. The oil and gas pass through the fan blades to the zeolite The oil and gas after adsorption and filtration by the zeolite disk reaches the input end of the heat exchanger. After being heated by the heat exchanger, the heated oil and gas are transported to the inside of the second sealed chamber through the exhaust fan inside the second air pipe, and then blown to the surface of the zeolite disk, thereby taking away the impurities adsorbed on the surface of the zeolite disk. The hot gas with the adsorbed impurities is then transported to the inside of the first sealed chamber for collection, and then the high-concentration exhaust gas is discharged into the ROT device through the exhaust fan inside the first air pipe. After deep treatment by the ROT device, clean gas is formed, and then the clean gas is discharged through the exhaust pipe.

[0014] The present invention provides a device for removing VOCs from oilfield tail gas, which has the following beneficial effects: 1. In the present invention, the motor can output rotational force, thereby driving the transmission belt to rotate, thereby driving the first transmission shaft to rotate, and then transmitting the rotational force to the interior of the transmission, and then driving the fan shaft to rotate through the output end of the transmission, thereby driving the fan blades to rotate, and then transmitting the high-flow pressure of the exhaust gas to the surface of the zeolite disk, thereby improving the traditional oil field tail gas VOCs removal. When the gas input to the removal equipment is mostly freely discharged from the gas generating equipment, this may make the gas pressure input to the removal equipment relatively small, resulting in the problem of low removal efficiency.

[0015] 2. In the present invention, the fan blades are driven to rotate by the first transmission shaft and the zeolite disk is driven to rotate at the same time, so that only one motor is needed to drive the zeolite disk and the fan blades to rotate, thereby saving energy.

[0016] 3. In the present invention, a high-efficiency filter plate, a medium-efficiency filter plate and a coarse-efficiency filter plate are arranged on one side of the rotating ring to pre-treat the oilfield tail gas to remove impurities therein, and then the VOCs are adsorbed by the zeolite disk. This combination of filtration and adsorption can better protect the zeolite disk, extend its service life, and at the same time improve the purification effect of the entire device on the tail gas.

[0017] 4. In the present invention, the heat exchanger is connected to the second sealed chamber through the second gas pipeline, so that the heat of the treated exhaust gas can be recycled. This design not only improves the energy utilization efficiency, but also reduces the operating cost of the device. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of a partial three-dimensional structure of the first transmission shaft of the present invention; Figure 2 It is a schematic diagram of the partial three-dimensional structure of the fan blade of the present invention; Figure 3 It is a schematic diagram of the rear three-dimensional structure of the present invention; Figure 4 It is a schematic diagram of the side elevation structure of the present invention; Figure 5 It is a schematic diagram of a partial three-dimensional structure of the first sealed chamber of the present invention; Figure 6 It is a schematic diagram of the local three-dimensional structure of the annular groove of the present invention; Figure 7 It is a three-dimensional schematic diagram of the structural assembly of the present invention.

[0019] Among them, 1. the first air supply pipe; 2. the ROT device; 3. the exhaust pipe; 4. the first air guide cover; 5. the high-efficiency filter plate; 6. the medium-efficiency filter plate; 7. the coarse-efficiency filter plate; 8. the swivel; 9. the first support frame; 10. the second air supply pipe; 11. the second air guide cover; 12. the second support frame; 13. the shell; 14. the zeolite disc; 15. the sealing plate; 16. the first transmission shaft; 17. the first limit block; 18. the transmission belt; 19. the motor; 20. the second limit block; 21. the fan blade; 22. the transmission; 23. the support rod; 24. the first sealing chamber; 25. the second sealing chamber; 26. the heat exchanger; 27. the annular groove. DETAILED DESCRIPTION

[0020] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] Embodiment 1: Please see attached Figure 1 -Attached Figure 2The embodiment of the present invention provides an oilfield tail gas VOCs removal device, including a rotating ring 8, a zeolite disc 14 is arranged inside the rotating ring 8, a dividing device is arranged on the outer wall of the zeolite disc 14, the middle part of the zeolite disc 14 is fixedly connected to the middle outer wall of the first transmission shaft 16, one end of the first transmission shaft 16 is fixedly connected to the first limit block 17, a motor 19 is arranged in front of the rotating ring 8, the outer wall of the motor 19 is fixedly connected to the inner wall of the second air guide cover 11, the output end of the motor 19 is fixedly provided with a second transmission shaft, the end of the second transmission shaft away from the motor 19 is fixedly connected to the second limit block 20, the second limit block 20 is connected to the first transmission shaft 16 through a transmission belt 18, the end of the first transmission shaft 16 away from the first limit block 17 is fixedly arranged at the input end of a transmission 22, the output end of the transmission 22 is fixedly arranged on the outer wall of the fan shaft, the outer wall of the fan shaft is fixedly connected to the fan blade 21, the outer wall of the transmission 22 is fixedly connected to one end of a support rod 23, and the other end of the support rod 23 is fixedly connected to the inner wall of the shell 13.

[0022] Specifically, the rotating ring 8 can fix the zeolite disc 14, the zeolite disc 14 can adsorb VOCs molecules, the first transmission shaft 16 can transmit the transmitted rotational force to the zeolite disc 14, the first limit block 17 can limit the movement of the transmission belt 18 to prevent the transmission belt 18 from moving out of the first transmission shaft 16, the motor 19 can output the rotational force, the second air guide cover 11 can guide the airflow to prevent the airflow from diffusing, and the second transmission shaft can transmit the rotational force at the output end of the motor 19 to the transmission belt 1 8, the transmission belt 18 can be used to transmit the rotational force transmitted from the second transmission shaft to the first transmission shaft 16, and the second limit block 20 can be used to limit the movement of the transmission belt 18 at the second transmission shaft end to prevent the transmission belt 18 from moving out of the second transmission shaft. The transmission 22 can convert the rotational force of the low-speed rotating first transmission shaft 16 into high-speed rotational force, which is then transmitted to the fan shaft, thereby driving the fan shaft to rotate, and then driving the fan blades 21 to rotate. The rotation of the fan blades 21 can increase the oil and gas flow rate transmitted to the removal device, thereby improving the adsorption efficiency of the zeolite disc 14.

[0023] Please see attached Figure 1 The dividing device includes a sealing plate 15 , and the outer wall of the sealing plate 15 is fixedly connected to the outer wall of the zeolite disk 14 .

[0024] Specifically, the sealing plate 15 can divide the zeolite disc 14 into a plurality of regions, thereby enabling targeted removal of impurities from the zeolite disc 14 , while the remaining portions that do not require removal can be used for large-scale oil and gas adsorption.

[0025] Please see attached Figure 7A first air guide cover 4 is fixedly connected to one side of the swivel 8 close to the shell 13 , and a high-efficiency filter plate 5 , a medium-efficiency filter plate 6 and a coarse-efficiency filter plate 7 are arranged on one end of the first air guide cover 4 away from the swivel 8 .

[0026] Specifically, the first air guide hood 4 can gather and organize the oil and gas so that the oil and gas can flow to the zeolite disk 14 in a concentrated manner. The coarse-effect filter plate 7 can filter out large particles of impurities in the oil and gas. The medium-effect filter plate 6 can filter out medium-diameter particles of impurities in the oil and gas. The high-efficiency filter plate 5 can filter out smaller-diameter particles of impurities in the oil and gas. Thus, through the layer-by-layer filtration of these three layers of filter plates, the damage of impurities in the exhaust gas to the zeolite disk 5 and the motor 19 behind is reduced, thereby extending the service life of the entire device, while ensuring that the quality of the exhaust gas entering the zeolite disk 14 and the ROT device 2 is relatively stable.

[0027] Please see attached Figure 5 A first sealed chamber 24 and a second sealed chamber 25 are provided on both sides of the upper part of the swivel 8. The top of the second sealed chamber 25 is fixedly connected to one end of the second gas pipe 10, and the other end of the second gas pipe 10 is fixedly connected to the top of the heat exchanger 26. The top of the first sealed chamber 24 is fixedly connected to one end of the first gas pipe 1, and the other end of the first gas pipe 1 is fixedly connected to the input end of the ROT device 2.

[0028] Specifically, exhaust fans are provided inside the second gas pipe 10 and the first gas pipe 1. The first sealed chamber 24 can collect the desorbed gas to prevent gas leakage. At the same time, the first sealed chamber 24 isolates the high-concentration VOCs gas after desorption from the gas in other stages to prevent the purified gas from being contaminated again, ensuring that the gas entering the ROT device 2 has a sufficiently high concentration, which is conducive to an efficient oxidation reaction in the ROT device 2, thereby improving the VOCs removal efficiency of the entire device. The second sealed chamber 25 can collect the purified gas, the second gas pipe 10 can transport the heated gas, the heat exchanger 26 can heat the purified gas, the first gas pipe 1 can transport the gas carrying desorbed impurities to the inside of the ROT device 2, and the ROT device 2 can purify the impurities adsorbed by the zeolite disk 14.

[0029] Please see attached Figure 5 The output end of the ROT device 2 is fixedly connected to an exhaust pipe 3.

[0030] Specifically, the exhaust pipe 3 can be used to discharge clean gas.

[0031] Please see attached Figure 7 The upper and lower ends of the heat exchanger 26 are fixedly connected to the inner wall of the second air guide cover 11 .

[0032] Specifically, the second air guide cover 11 can play a role in fixing the heat exchanger 26 .

[0033] Please see attached Figure 6 An annular groove 27 is formed on the inner wall of the rotating ring 8 , and the zeolite disk 14 is arranged inside the annular groove 27 .

[0034] Specifically, the annular groove 27 can fix the zeolite disk 14 , so that the zeolite disk 14 can rotate more stably.

[0035] Please see attached Figure 3 -Attached Figure 4 The bottom of the swivel 8 is fixedly connected to a first support frame 9 , and the bottom of the second air guide cover 11 is fixedly connected to a second support frame 12 on a side away from the swivel 8 .

[0036] Specifically, the first support frame 9 and the second support frame 12 can support the entire device, so that the device can operate stably.

[0037] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for removing VOCs from oilfield tail gas, comprising a rotating ring (8), characterized in that: A zeolite disc (14) is arranged inside the rotating ring (8), and a dividing device is arranged on the outer wall of the zeolite disc (14). The middle part of the zeolite disc (14) is fixedly connected to the middle outer wall of the first transmission shaft (16), and one end of the first transmission shaft (16) is fixedly connected to a first limit block (17). A motor (19) is arranged in front of the rotating ring (8), and the outer wall of the motor (19) is fixedly connected to the inner wall of the second air guide cover (11). A second transmission shaft is fixedly arranged at the output end of the motor (19), and one end of the second transmission shaft away from the motor (19) is fixedly connected to the inner wall of the second air guide cover (11). A second limit block (20) is fixedly connected to the first transmission shaft (16), the second limit block (20) is connected to the first transmission shaft (16) via a transmission belt (18), one end of the first transmission shaft (16) away from the first limit block (17) is fixedly arranged at the input end of a transmission (22), the output end of the transmission (22) is fixedly arranged at the outer wall of the fan shaft, the outer wall of the fan shaft is fixedly connected to a fan blade (21), the outer wall of the transmission (22) is fixedly connected to one end of a support rod (23), and the other end of the support rod (23) is fixedly connected to the inner wall of the housing (13).

2. The oilfield tail gas VOCs removal device according to claim 1, characterized in that: The dividing device comprises a sealing plate (15), the outer wall of the sealing plate (15) being fixedly connected to the outer wall of the zeolite disc (14).

3. The oilfield tail gas VOCs removal device according to claim 1, characterized in that: A first air guide cover (4) is fixedly connected to a side of the rotating ring (8) close to the housing (13), and a high-efficiency filter plate (5), a medium-efficiency filter plate (6), and a coarse-efficiency filter plate (7) are provided at an end of the first air guide cover (4) away from the rotating ring (8).

4. The oilfield tail gas VOCs removal device according to claim 1, characterized in that: A first sealed chamber (24) and a second sealed chamber (25) are provided on both sides of the upper part of the rotating ring (8); the top of the second sealed chamber (25) is fixedly connected to one end of the second gas pipeline (10); the other end of the second gas pipeline (10) is fixedly connected to the top of the heat exchanger (26); the top of the first sealed chamber (24) is fixedly connected to one end of the first gas pipeline (1); the other end of the first gas pipeline (1) is fixedly connected to the input end of the ROT device (2).

5. The oilfield tail gas VOCs removal device according to claim 4, characterized in that: The output end of the ROT device (2) is fixedly connected to an exhaust pipe (3).

6. The oilfield tail gas VOCs removal device according to claim 4, characterized in that: The upper and lower ends of the heat exchanger (26) are fixedly connected to the inner wall of the second air guide cover (11).

7. The oilfield tail gas VOCs removal device according to claim 1, characterized in that: An annular groove (27) is formed on the inner wall of the rotating ring (8), and the zeolite disc (14) is arranged inside the annular groove (27).

8. The oilfield tail gas VOCs removal device according to claim 1, characterized in that: The bottom of the rotating ring (8) is fixedly connected to a first support frame (9), and the bottom of the second air guide cover (11) is fixedly connected to a second support frame (12) on a side away from the rotating ring (8).

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