Oil field waste gas treatment equipment

Abstract

The utility model relates to the technical field of waste gas treatment, in particular to oil field waste gas treatment equipment. Comprising an oil-gas separator, a gas outlet pipe of the oil-gas separator is communicated with an inlet pipe of an adsorption and desorption device, a vacuum pipe of the adsorption and desorption device is communicated with a vacuum pump, the adsorption and desorption device comprises a tank body, the vacuum pipe and the inlet pipe are fixed at the lower end of the tank body, and the upper end of the tank body is fixedly communicated with an outlet pipe; a plurality of baffles are uniformly fixed in the tank body between the two sieve plates from top to bottom, a vertical pipe is arranged in the tank body, the lower end of the vertical pipe penetrates through the sieve plate below, the vacuum pipe is fixedly communicated with the lower end of the vertical pipe, a plurality of kerfs are formed in the vertical pipe, and a sealing assembly is rotationally and hermetically connected in the vertical pipe. According to the equipment, through innovative reconstruction of a mechanical structure, the industrial problems of desorption efficiency and maintenance cost are solved in a breakthrough manner on the premise that the adsorption performance is ensured. And compared with a traditional device, the comprehensive operation cost is reduced, and remarkable economic benefits and environmental protection values are achieved.

Description

Technical Field

[0001] This utility model relates to the field of waste gas treatment technology, specifically to an oilfield waste gas treatment device. Background Technology

[0002] Oil extraction generates a large amount of wastewater. This wastewater, while being treated in wastewater treatment tanks, produces significant amounts of exhaust gas, requiring the use of exhaust gas treatment devices within the oilfield wastewater treatment tanks. A common method for treating exhaust gas in oil and gas fields is flare combustion. However, actual observations show that flare combustion still produces substantial amounts of smoke and dust, polluting the air. Furthermore, when the oil itself is high-sulfur or contains unusable natural gas, combustion can generate even larger amounts of gaseous pollutants.

[0003] The exhaust gas contains crude oil, and direct treatment of oily exhaust gas is costly. Therefore, it is necessary to separate the oil and gas. The oil and gas containing a small amount of crude oil is treated by an adsorption-desorption device, and then the oil and gas in the adsorption-desorption device are collected and recycled for reuse.

[0004] To improve the adsorption efficiency of oil and gas, existing adsorption-desorption devices have serpentine channels inside the tank. However, during desorption, the oil and gas still need to escape along the serpentine channels, resulting in low desorption efficiency.

[0005] To address the aforementioned technical problems, patent document CN209564810U discloses an adsorption-desorption device for oil and gas recovery. In use, it mainly operates in two states: adsorption and desorption. In the adsorption state, a mixture of oil, gas, and air is introduced into the tank through the inlet pipe, passes through a sieve plate, and comes into contact with activated carbon particles. Due to the presence of baffles and connecting gaps, the airflow moves upward along a serpentine path, extending the contact distance between the gas and activated carbon particles and improving the adsorption effect. The clean air is finally discharged outdoors through the exhaust pipe. After adsorption saturation, it enters the desorption state. The exhaust pipe and inlet pipe are closed, and the vacuum pipe is opened. Under the action of the vacuum pump, the oil and gas detach from the activated carbon particles and move downward. Because a one-way valve is installed on the short pipe, the oil and gas can be directly discharged downward through the short pipe, thus exiting through a shorter path from the vacuum pipe, improving the desorption effect. In summary, this invention possesses excellent adsorption and desorption performance, and can improve the oil and gas recovery rate. However, the one-way valve installed on the partition is located inside the activated carbon particles, and it is inconvenient to repair after the one-way valve is damaged, resulting in high equipment investment costs for this device.

[0006] Patent document CN115751184A discloses a pressure balancing device for oil and gas storage tanks. This technology includes an adsorption-desorption device comprising a treatment tank with two vertically arranged sieves fixed inside. The portion of the treatment tank between the two sieves forms a treatment chamber filled with an adsorption medium. A vacuum tube and multiple branch pipes communicate with the treatment chamber. Guide components corresponding to the branch pipes are fixed inside the treatment chamber, with one end of each branch pipe positioned above the guide component. Multiple guide components are staggered horizontally along the height of the treatment tank. Each guide component comprises a stainless steel plate, and multiple vertical through-tubes are provided on each stainless steel plate. A filter cloth is fixed to the upper end of a stainless steel plate. Oil and gas enter the processing chamber through multiple branch pipes. As the oil and gas enter the processing chamber and move towards the recovery tank, a serpentine channel is formed within the processing chamber due to the staggered arrangement of the stainless steel plates. Therefore, the oil and gas moving towards the recovery tank will move within this serpentine channel. By using filter cloth on the stainless steel plate, the oil and gas cannot move vertically downwards through the pipes during its movement within the serpentine channel, thus ensuring its movement within the channel. This increases the contact time between the oil and gas and the adsorption medium, improving the adsorption efficiency of the adsorption medium. The adsorption-desorption device enters the desorption state. The oil and gas in the recovery tank, as well as the oil and gas separated from the adsorption medium, enter the oil tank through the inlet pipe, thereby compensating for the pressure in the oil tank and maintaining pressure balance. During the oil and gas desorption process using the adsorption medium, a negative pressure is generated inside the treatment tank, allowing oil and gas to enter the through-pipe and rise through the filter cloth. During desorption, the oil and gas desorbed from the adsorption medium rises vertically within the treatment tank. This technical solution, by setting up filter plates and through-pipes that allow unidirectional oil and gas flow, enables the oil and gas to move along a serpentine channel during adsorption and axially within the tank during desorption, thereby improving the desorption effect. However, this device also requires extensive processing of the baffles, and the filter cloth is easily damaged, making repair inconvenient after damage. Utility Model Content

[0007] The main purpose of this utility model is to provide an oilfield waste gas treatment equipment with low equipment investment cost, low failure rate, and high desorption efficiency.

[0008] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0009] An oilfield waste gas treatment device includes an oil-gas separator. The outlet pipe of the oil-gas separator is connected to the inlet pipe of an adsorption-desorption device. The vacuum pipe of the adsorption-desorption device is connected to a vacuum pump. The adsorption-desorption device includes a tank. The vacuum pipe and the inlet pipe are fixed at the lower end of the tank. An outlet pipe is fixedly connected to the upper end of the tank. Two sieve plates are fixed inside the tank. Multiple baffles are evenly fixed from top to bottom inside the tank between the two sieve plates. A gap is formed between one side of the baffle and the inner wall of the tank. Two adjacent gaps are staggered. A vertical pipe is installed inside the tank. The lower end of the vertical pipe passes through... The vacuum tube is fixedly connected to the lower end of the riser through the sieve plate below. Multiple slits are opened on the riser section between the two sieve plates, and filter screens are fixed in the slits. A sealing component is rotatably and sealingly connected inside the riser. The sealing component can seal the slits. After the sealing component rotates inside the riser, the slits connect the inside of the tank and the inside of the riser. A rotating rod is concentrically fixed at the lower end of the sealing component. The lower end of the rotating rod passes through the lower end of the riser and the lower end of the tank. The rotating rod is rotatably and sealingly connected to the lower end of the riser and the lower end of the tank. Activated carbon is filled in the space between the riser, the tank and the two sieve plates.

[0010] Specifically, the sealing assembly includes a connecting plate rotatably connected to the upper and lower ends of the riser. Multiple arc-shaped plates are fixed between the two connecting plates. The number of arc-shaped plates is equal to the number of cuts and corresponds one-to-one. The arc-shaped plates are in sealing contact with the inner wall of the riser and can seal the cuts.

[0011] Specifically, the riser passes through the baffle, and the riser is fixedly connected to the baffle.

[0012] Specifically, a handwheel is fixed to the lower end of the rotating rod.

[0013] Specifically, the arc-shaped plate is concentric with the riser, and a sealing layer is fixed to the outer edge of the arc-shaped plate. The outer edge of the arc-shaped plate and the inner edge of the riser are in sealed contact through the sealing layer.

[0014] Specifically, the upper end of the riser is fixedly connected to the sieve plate above it.

[0015] Specifically, the multiple slits are evenly distributed around the central circumference of the riser.

[0016] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0017] 1. Through the coordinated design of the riser slit and the rotary sealing assembly, the system achieves switching between adsorption and desorption modes. The arc-shaped plate of the sealing assembly completely covers the slit, forcing the oil and gas to move along a serpentine path within the tank, extending the contact time between the oil and gas and the activated carbon, and improving the adsorption effect. The slit and the arc-shaped plate are staggered to form the shortest axial desorption channel, improving the desorption efficiency.

[0018] 2. The riser passes through multiple baffles and is rigidly connected to the upper and lower screen plates to form an overall load-bearing frame, suppressing structural vibrations caused by the flow of the medium.

[0019] 3. The rotary sealing device replaces the traditional one-way valve, avoiding the risk of valve blockage and failure, ensuring complete closure during adsorption and full opening during desorption, resulting in a low failure rate and low equipment investment cost.

[0020] 4. The interlaced notches of the baffles create an asymmetric flow field, which enhances the disturbance of the activated carbon layer and improves the oil and gas diffusion rate and adsorbent utilization.

[0021] 5. Extending the contact time during the adsorption stage reduces the amount of activated carbon used, while shortening the path during the desorption stage reduces the power consumption of the vacuum pump. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the device.

[0023] Figure 2 for Figure 1 A magnified view of region A in the middle.

[0024] Figure 3 This is a schematic diagram of the cross-sectional structure of the riser.

[0025] The components in the attached diagram are named as follows: 1. Tank body, 2. Outlet pipe, 3. Inlet pipe, 4. Screen plate, 5. Baffle, 6. Activated carbon, 7. Vacuum tube, 8. Vacuum pump, 9. Oil-gas separator, 10. Riser, 11. Slit, 12. Filter screen, 13. Arc plate, 14. Connecting plate, 15. Rotating rod. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0027] Example 1: Refer to Figures 1-3 As shown, an oilfield waste gas treatment device includes an oil-gas separator 9, the outlet pipe of the oil-gas separator 9 is connected to the inlet pipe 3 of the adsorption-desorption device, and the vacuum pipe 7 of the adsorption-desorption device is connected to the vacuum pump 8.

[0028] The adsorption-desorption device includes a tank 1, a vacuum tube 7 and an inlet pipe 3 fixed at the lower end of the tank 1, and an outlet pipe 2 fixedly connected to the upper end of the tank 1.

[0029] Two sieve plates 4 are fixed inside the tank body 1. Multiple baffles 5 are evenly fixed from top to bottom inside the tank body 1 between the two sieve plates 4. A gap is formed between one side of the baffle 5 and the inner wall of the tank body 1, and two adjacent gaps are staggered.

[0030] A riser 10 is installed inside the tank body 1. The lower end of the riser 10 passes through the lower sieve plate 4, and the upper end of the riser 10 is fixedly connected to the upper sieve plate 4. The vacuum tube 7 is fixedly connected to the lower end of the riser 10.

[0031] The riser 10 passes through the baffle 5, and the riser 10 is fixedly connected to the baffle 5.

[0032] The riser 10 passes through the multi-stage baffles 5 and is rigidly connected to the upper and lower screen plates 4 to form an overall load-bearing frame, which suppresses structural vibration caused by the flow of the medium.

[0033] Multiple slits 11 are provided on the riser 10 between the two sieve plates 4, and filter screens 12 are fixed inside the slits 11. The multiple slits 11 are evenly distributed around the circumference of the riser 10.

[0034] A sealing component is rotatably connected inside the riser 10. The sealing component can seal the cut 11. After the sealing component rotates inside the riser 10, the cut 11 connects the inside of the tank body 1 and the inside of the riser 10.

[0035] A rotating rod 15 is concentrically fixed at the lower end of the sealing assembly. The lower end of the rotating rod 15 passes through the lower end of the riser 10 and the lower end of the tank 1, and the rotating rod 15 is rotatably and sealingly connected to the lower end of the riser 10 and the lower end of the tank 1. A handwheel is fixed at the lower end of the rotating rod 15.

[0036] The space between the riser 10, the tank 1 and the two sieve plates 4 is filled with activated carbon 6.

[0037] The sealing assembly includes a connecting plate 14 rotatably connected to the upper and lower ends of the riser 10. Multiple arc-shaped plates 13 are fixed between the two connecting plates 14. The number of arc-shaped plates 13 is equal to the number of cuts 11 and corresponds one-to-one. The arc-shaped plates 13 are in sealing contact with the inner wall of the riser 10 and can seal the cuts 11.

[0038] After the exhaust gas enters the oil-gas separator 9, the crude oil and oil-gas in the exhaust gas are separated. The oil-gas enters the tank 1 through the inlet pipe 3. Under the obstruction of multiple baffles 5, the oil-gas flows in a serpentine manner in the activated carbon 6, thereby improving the adsorption effect of the oil-gas. After the oil-gas is adsorbed by the activated carbon 6, the clean air is discharged upward through the outlet pipe 2. At this time, the slit 11 is blocked by the arc plate 13, which can prevent the oil-gas from rising in the riser pipe 10, ensuring that the activated carbon 6 can effectively adsorb the oil-gas.

[0039] During desorption, the outlet pipe 2 and inlet pipe 3 are closed, and the rotating rod 15 is rotated. The rotating rod 15 drives the connecting plate 14 and the arc plate 13 to rotate. After the arc plate 13 and the slit 11 are misaligned, the slit 11 connects the inside of the tank 1 and the inside of the riser 10. The vacuum pump 8 is started. Under the action of the vacuum pump 8, the oil and gas separate from the activated carbon 6 and move towards the riser 10. At this time, the oil and gas can directly enter the riser 10 through the slit 11, thus exiting through the vacuum pipe 7 via a shorter path, improving the desorption efficiency.

[0040] Example 2: Based on Example 1, referring to... Figure 2 and Figure 3 As shown, the arc plate 13 is concentric with the riser 10, and a sealing layer is fixed on the outer edge of the arc plate 13. The outer edge of the arc plate 13 and the inner edge of the riser 10 are in sealed contact through the sealing layer.

[0041] By fixing a sealing layer to the outer edge of the arc plate 13, the sealing performance of the arc plate 13 when sealing the cut 11 can be improved, and oil and gas can be prevented from entering the riser 10 during adsorption.

[0042] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An oilfield waste gas treatment device, comprising an oil-gas separator (9), wherein the outlet pipe of the oil-gas separator (9) is connected to the inlet pipe (3) of an adsorption-desorption device, and the vacuum pipe (7) of the adsorption-desorption device is connected to a vacuum pump (8), characterized in that, The adsorption-desorption device includes a tank (1), a vacuum tube (7), and an inlet pipe (3) fixed at the lower end of the tank (1). An outlet pipe (2) is fixedly connected to the upper end of the tank (1). Two sieve plates (4) are fixed inside the tank (1). Multiple baffles (5) are evenly fixed from top to bottom inside the tank (1) between the two sieve plates (4). A gap is formed between one side of the baffle (5) and the inner wall of the tank (1). Two adjacent gaps are staggered. A riser (10) is installed inside the tank (1). The lower end of the riser (10) passes through the sieve plate (4) below. The vacuum tube (7) is fixedly connected to the lower end of the riser (10). The riser (10) between the two sieve plates (4) has an opening at the top. Multiple slits (11) are provided, and a filter screen (12) is fixed inside the slits (11). A sealing component is rotatably and sealingly connected inside the riser (10). The sealing component can seal the slits (11). After the sealing component rotates inside the riser (10), the slits (11) connect the inside of the tank (1) and the inside of the riser (10). A rotating rod (15) is concentrically fixed at the lower end of the sealing component. The lower end of the rotating rod (15) passes through the lower end of the riser (10) and the lower end of the tank (1). The rotating rod (15) is rotatably and sealingly connected to the lower end of the riser (10) and the lower end of the tank (1). Activated carbon (6) is filled in the space between the riser (10), the tank (1) and the two sieve plates (4).

2. The oilfield waste gas treatment equipment according to claim 1, characterized in that, The sealing assembly includes a connecting plate (14) rotatably connected to the upper and lower ends of the riser (10). Multiple arc-shaped plates (13) are fixed between the two connecting plates (14). The number of arc-shaped plates (13) is equal to the number of cuts (11) and corresponds one-to-one. The arc-shaped plates (13) are in sealing contact with the inner wall of the riser (10), and the arc-shaped plates (13) can seal and block the cuts (11).

3. The oilfield waste gas treatment equipment according to claim 1, characterized in that, The riser (10) passes through the baffle (5), and the riser (10) is fixedly connected to the baffle (5).

4. The oilfield waste gas treatment equipment according to claim 1, characterized in that, A handwheel is fixed to the lower end of the rotating rod (15).

5. The oilfield waste gas treatment equipment according to claim 2, characterized in that, The arc plate (13) is concentric with the riser (10), and a sealing layer is fixed on the outer edge of the arc plate (13). The outer edge of the arc plate (13) and the inner edge of the riser (10) are in sealed contact through the sealing layer.

6. The oilfield waste gas treatment equipment according to claim 1, characterized in that, The upper end of the riser (10) is fixedly connected to the sieve plate (4) above.

7. The oilfield waste gas treatment equipment according to claim 1, characterized in that, The multiple slits (11) are evenly distributed around the central circumference of the riser (10).

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