Oil gas recovery device

Abstract

The utility model relates to the field of petrochemical industry, and discloses an oil gas recovery device which comprises a primary absorption unit and a secondary absorption unit, the primary absorption unit is a supergravity absorption unit, and the secondary absorption unit is an absorption tank; the supergravity absorption unit is cylindrical, the upper part of the cylinder is provided with an absorption section, and the lower part of the cylinder is provided with a liquid storage section; in the absorption section, the side wall of the barrel is provided with an oil-gas inlet, and the top of the barrel is provided with an absorbent inlet and an oil-gas outlet; in the liquid storage section, an absorbent outlet is formed in the lower part of the side wall of the barrel, and a water outlet is formed in the bottom of the barrel; the absorption tank is provided with an oil gas inlet, a purified gas outlet and a regenerated gas outlet; and a regenerated gas outlet of the absorption tank is connected with an oil gas inlet of the supergravity absorption unit. The oil gas recovery device can effectively avoid the problem of ice blockage of an existing condensation method oil gas recovery equipment system, and is safe, stable, high in oil gas recovery efficiency and good in oil gas recovery effect.

Description

Technical Field

[0001] The utility model relates to the field of petrochemical industry, and particularly relates to an oil and gas recovery device. Background Art

[0002] In the petrochemical industry, a large amount of volatile organic compounds (VOCs) will escape during the storage and packaging process of oil products and chemicals. This will not only cause waste of resources and reduce the economic benefits of enterprises, but also pollute the surrounding environment and endanger the health of personnel. In addition, since oil and gas are prone to form explosive mixtures with air (the lower explosion limit is generally 1% - 6%), the oil and gas will accumulate on the ground after escaping, posing a great safety hazard to enterprises. At present, the condensation method is mainly used to recover oil and gas during the storage and packaging process of oil products and chemicals, but the following problems mainly exist during the operation of the condensation method oil and gas treatment device: First, the condensation system has serious frosting and is prone to ice blockage, making it difficult for the condensation system to operate continuously and stably; second, the defrosting process usually uses hot gas for defrosting, which will increase the refrigeration load of the refrigeration unit and lead to increased energy consumption.

[0003] Patent CN202246576U discloses an oil and gas low-temperature condensation absorption recovery device, which includes a refrigeration unit, a lean absorbent transfer pump, a venturi ejector, an oil and gas condensation absorption mixture separator, an oil and gas pre-cooler heat exchanger, and a pre-cooler oil and gas gas-liquid separator. The oil and gas passes through the venturi ejector to draw air and mix with the low-temperature absorbent, and the oil and gas components are condensed and cooled by the low-temperature absorbent for separation. However, at the same time, the moisture in the oil and gas will also be condensed and frozen by the sub-zero absorbent, and there is an ice blockage problem during operation.

[0004] CN105289032A discloses a cold absorption method for recovering extremely volatile organic compounds, which includes processes such as gas compression, cooling, condensation, absorption, separation, and residual pressure refrigeration. It combines pressurized condensation and supergravity absorption, changes deep cold recovery to shallow cold recovery, can improve the recovery efficiency, and is applicable to aspects such as organic chloride and oil and gas recovery. However, it is necessary to compress the oil and gas to a relatively high pressure for cold absorption, which requires high equipment requirements and the total energy consumption of the device is also relatively large. Utility Model Content

[0005] In order to overcome the problems of easy frosting and ice blockage existing in the condensation method oil and gas recovery device in the prior art, the utility model provides an oil and gas recovery device, which is not easy to frost and ice block, and is safe and energy-saving.

[0006] In order to achieve the above purpose, the utility model provides an oil and gas recovery device, which includes a primary absorption unit and a secondary absorption unit;

[0007] The primary absorption unit is a supergravity absorption unit, and the secondary absorption unit is an absorption tank;

[0008] The supergravity absorption unit is cylindrical. An absorption section is provided at the upper part of the cylinder body, and a liquid storage section is provided at the lower part of the cylinder body;

[0009] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an oil and gas outlet are provided at the top of the cylinder body;

[0010] In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain outlet is provided at the bottom of the cylinder body;

[0011] The absorption tank is provided with an oil and gas inlet, a purified gas outlet and a regenerated gas outlet;

[0012] The regenerated gas outlet of the absorption tank is connected to the oil and gas inlet of the supergravity absorption unit.

[0013] The utility model has the following beneficial technical effects:

[0014] First, the oil and gas to be treated can completely remove water by turning it into fine ice particles through the primary absorption unit. The fine ice particles are discharged from the oil and gas recovery device through the bottom drain outlet, effectively avoiding the problem of ice blockage in the existing condensation method oil and gas recovery equipment system, and being safe and stable;

[0015] Second, the primary absorption unit can cool and separate the heavy components, water and most of the light components in the oil and gas, and the secondary absorption unit can separate the remaining C3-C5 components in the oil and gas; The device composed of the combination of the primary and secondary absorption units has high oil and gas recovery efficiency and good effect. Description of the Drawings

[0016] Figure 1 It is a drawing of an oil and gas recovery device provided by the utility model.

[0017] Description of the Reference Numerals

[0018] 1 - Supergravity absorption unit, 2 - Circulation pump, 3 - Cooler, 4 - Induced draft fan, 5A - First absorption tank, 5B - Second absorption tank, 6 - Regenerated gas pump. Detailed Embodiment

[0019] The utility model provides an oil and gas recovery device, including a primary absorption unit and a secondary absorption unit;

[0020] The primary absorption unit is the supergravity absorption unit 1, and the secondary absorption unit is the absorption tank;

[0021] The supergravity absorption unit 1 is cylindrical. An absorption section is provided at the upper part of the cylinder body, and a liquid storage section is provided at the lower part of the cylinder body;

[0022] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an oil and gas outlet are provided at the top of the cylinder body;

[0023] In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain outlet is provided at the bottom of the cylinder body.

[0024] The absorption tank is provided with an oil and gas inlet, a purified gas outlet and a regeneration gas outlet.

[0025] The regeneration gas outlet of the absorption tank is connected to the oil and gas inlet of the rotating packed bed absorption unit 1.

[0026] In the present utility model, being connected can mean being directly connected through a pipeline, or can also mean being connected through a pipeline and other devices.

[0027] The oil and gas recovery device provided by the present utility model is not easily blocked by ice, is safe and stable, and the device composed of the combination of the first and second absorption units has high oil and gas recovery efficiency and good effect.

[0028] According to a preferred embodiment of the present utility model, the device is further provided with a circulation pump 2. The circulation pump 2 is provided with an inlet and an outlet. The inlet of the circulation pump 2 is connected to the absorbent outlet of the rotating packed bed absorption unit 1. The outlet of the circulation pump 2 is connected to the absorbent inlet of the rotating packed bed absorption unit 1.

[0029] According to a preferred embodiment of the present utility model, the device is further provided with a cooler 3. The outlet of the circulation pump 2 is connected to the absorbent inlet of the rotating packed bed absorption unit 1 through the cooler 3.

[0030] According to a preferred embodiment of the present utility model, the device is further provided with an induced draft fan 4. The oil and gas outlet of the rotating packed bed absorption unit 1 is connected to the oil and gas inlet of the absorption tank through the induced draft fan 4.

[0031] According to a preferred embodiment of the present utility model, the device is further provided with a regeneration gas pump 6. The regeneration gas outlet of the absorption tank is connected to the oil and gas inlet of the rotating packed bed absorption unit 1 through the regeneration gas pump 6.

[0032] According to a preferred embodiment of the present utility model, the second absorption unit includes at least two absorption tanks connected in parallel.

[0033] In the above preferred embodiment, the parallel absorption tanks can further improve the processing capacity of the second absorption unit, and one or several absorption tanks can be controlled for regeneration without affecting the adsorption of other absorption tanks.

[0034] According to a more preferred embodiment of the present utility model, the second absorption unit includes a first absorption tank 5A and a second absorption tank 5B connected in parallel.

[0035] According to a preferred embodiment of the present utility model, a drain outlet is provided at the bottom of the cylinder body of the liquid storage section of the rotating packed bed absorption unit 1.

[0036] According to a preferred embodiment of the present utility model, the bottom of the liquid storage section cylinder of the supergravity absorption unit 1 is inverted conical.

[0037] According to a preferred embodiment of the present utility model, a filter screen is provided at the absorbent outlet of the supergravity absorption unit 1, and the filter screen can filter ice particles in the absorbent.

[0038] According to a preferred embodiment of the present utility model, a liquid supplement pipe is further provided at the inlet of the circulation pump 2. The regeneration gas pump 6 is a vacuum pump.

[0039] According to the present utility model, preferably, the supergravity absorption unit is selected from a disk type, a spiral plate type and a baffle type supergravity rotating bed, and preferably a disk type supergravity rotating bed.

[0040] According to a particularly preferred embodiment of the present utility model, as Figure 1 shown, the device includes a primary absorption unit and a secondary absorption unit;

[0041] The primary absorption unit is the supergravity absorption unit 1, and the secondary absorption unit is an absorption tank;

[0042] The supergravity absorption unit 1 is cylindrical, with an absorption section provided at the upper part of the cylinder body and a liquid storage section provided at the lower part of the cylinder body;

[0043] In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an oil and gas outlet are provided at the top of the cylinder body;

[0044] In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain outlet is provided at the bottom of the cylinder body;

[0045] The absorption tank is provided with an oil and gas inlet, a purified gas outlet and a regeneration gas outlet;

[0046] The regeneration gas outlet of the absorption tank is connected to the oil and gas inlet of the supergravity absorption unit 1.

[0047] The device is further provided with a circulation pump 2. The circulation pump 2 is provided with an inlet and an outlet. The inlet of the circulation pump 2 is connected to the absorbent outlet of the supergravity absorption unit 1. The outlet of the circulation pump 2 is connected to the absorbent inlet of the supergravity absorption unit 1.

[0048] The device is further provided with a cooler 3. The outlet of the circulation pump 2 is connected to the absorbent inlet of the supergravity absorption unit 1 via the cooler 3.

[0049] The device is further provided with an induced draft fan 4. The oil and gas outlet of the supergravity absorption unit 1 is connected to the oil and gas inlet of the absorption tank via the induced draft fan 4.

[0050] The device is also provided with a regeneration air pump 6. The regeneration air outlet of the absorption tank is connected to the oil and gas inlet of the high gravity absorption unit 1 through the regeneration air pump 6.

[0051] The secondary absorption unit includes a first absorption tank 5A and a second absorption tank 5B which are arranged in parallel.

[0052] A drain port is provided at the bottom of the liquid storage section cylinder body of the high gravity absorption unit 1.

[0053] The bottom of the liquid storage section cylinder body of the high gravity absorption unit 1 is in an inverted conical shape.

[0054] A filter screen is provided at the absorbent outlet of the high gravity absorption unit 1, and the filter screen can filter ice particles in the absorbent.

[0055] A liquid supplement pipe is further provided at the inlet of the circulation pump 2. The regeneration air pump 6 is a vacuum pump.

[0056] The high gravity absorption unit is a disc type high gravity rotating bed.

[0057] The following specifically describes a preferred embodiment provided by the present invention in combination with the oil and gas recovery method:

[0058] Logistics I is the oil and gas to be processed, which countercurrently transfers mass and heat with the absorbent at -50°C to -20°C in the high gravity absorption unit 1. The absorbent condenses and absorbs C6 and above components and most of the C3-C5 components. At the same time, the water in the oil and gas is also condensed into ice particles and falls to the bottom of the liquid storage section. The oil and gas outlet of the high gravity absorption unit 1 discharges Logistics II.

[0059] The absorbent used in the high gravity absorption unit 1 is pressurized by the circulation pump 2 and then cooled to -50°C to -20°C again by the cooler 3, and then pumped back into the high gravity absorption unit 1 for recycling.

[0060] Logistics II enters the absorption tank for low-temperature adsorption treatment. The absorbent condenses and absorbs the remaining C3 and above components, and the adsorption temperature is -30°C to -10°C, obtaining Logistics III, and Logistics III is the purified gas.

[0061] The absorbent used in the absorption tank is regenerated by vacuum, the regeneration pressure is 5-10 kPa, and the regeneration gas is sent to the high gravity absorption unit 1 for absorption treatment.

[0062] The purified gas can be further sent to a boiler and / or a catalytic oxidation or regenerative thermal oxidation device.

[0063] The preferred embodiments of the present utility model have been described in detail above. However, the present utility model is not limited thereto. Within the scope of the technical concept of the present utility model, various simple modifications can be made to the technical solution of the present utility model, including any other suitable combination of each technical feature. These simple modifications and combinations should also be regarded as the content disclosed by the present utility model and fall within the protection scope of the present utility model.

Claims

1. An oil and gas recovery device, characterized in that, It includes a primary absorption unit and a secondary absorption unit; The primary absorption unit includes a rotating packed bed absorption unit (1), and the secondary absorption unit includes an absorption tank; The rotating packed bed absorption unit (1) is cylindrical, with an absorption section provided at the upper part of the cylinder body and a liquid storage section provided at the lower part of the cylinder body; In the absorption section, an oil and gas inlet is provided on the side wall of the cylinder body, and an absorbent inlet and an oil and gas outlet are provided at the top of the cylinder body; In the liquid storage section, an absorbent outlet is provided at the lower part of the side wall of the cylinder body, and a drain port is provided at the bottom of the cylinder body; The absorption tank is provided with an oil and gas inlet, a purified gas outlet and a regenerated gas outlet; The regenerated gas outlet of the absorption tank is connected to the oil and gas inlet of the rotating packed bed absorption unit (1).

2. The device according to claim 1, characterized in that The device is further provided with a circulation pump (2); The circulation pump (2) is provided with an inlet and an outlet; The inlet of the circulation pump (2) is connected to the absorbent outlet of the rotating packed bed absorption unit (1); The outlet of the circulation pump (2) is connected to the absorbent inlet of the rotating packed bed absorption unit (1).

3. The device according to claim 2, characterized in that, The device is further provided with a cooler (3); The outlet of the circulation pump (2) is connected to the absorbent inlet of the rotating packed bed absorption unit (1) via the cooler (3).

4. The device according to claim 3, characterized in that, The device is further provided with a draft fan (4); The oil and gas outlet of the rotating packed bed absorption unit (1) is connected to the oil and gas inlet of the absorption tank via the draft fan (4).

5. The device according to claim 4, characterized in that, The device is further provided with a regenerated gas pump (6); The regenerated gas outlet of the absorption tank is connected to the oil and gas inlet of the rotating packed bed absorption unit (1) via the regenerated gas pump (6).

6. The device according to claim 5, characterized in that, The secondary absorption unit includes at least two absorption tanks arranged in parallel.

7. The device according to claim 6, characterized in that, The secondary absorption unit includes a first absorption tank (5A) and a second absorption tank (5B) arranged in parallel.

8. The device according to claim 1, characterized in that, The bottom of the liquid storage section cylinder body of the rotating packed bed absorption unit (1) is inverted conical.

9. The device according to claim 1, characterized in that, A filter screen is provided at the absorbent outlet of the rotating packed bed absorption unit (1).

10. The device according to claim 2, characterized in that, A liquid supplement pipe is further provided at the inlet of the circulation pump (2).

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