Oil depot oil gas recovery nitrogen making system

Abstract

The inlet end of a compressor is connected with an oil-gas pipeline, the outlet end of the compressor is connected with a gas-liquid separator, the gas phase outlet end of the gas-liquid separator is connected with an oil-gas cooler, and the liquid phase outlet end of the compressor is connected with an oil outlet main pipeline; the gas-phase outlet end of the oil-gas cooler is connected with the non-condensable gas membrane separator, and the liquid-phase outlet end of the oil-gas cooler is connected with the oil storage tank; the non-condensable gas membrane separator, the non-condensable gas filter, the activated carbon adsorber, the non-condensable gas buffer tank, the pressure swing adsorber and the nitrogen storage tank are sequentially connected through pipelines. The inlet end of the compressor is further connected with an air inlet pipeline, and an air filter is arranged on the air inlet pipeline. The gas phase outlet end of the gas-liquid separator is connected with an air dryer through a pipeline, and the gas outlet of the air dryer is connected with the non-condensable gas membrane separator through a pipeline. And the non-condensable gas after oil recovery enters the pressure swing adsorber to prepare nitrogen which is used as a nitrogen source for nitrogen sealing. The device disclosed by the utility model can meet the compression nitrogen generation of an air and oil gas system.

Description

Technical Field

[0001] The utility model relates to the technical field of nitrogen production and nitrogen sealing, and in particular to an oil depot oil and gas recovery nitrogen production system. Background Art

[0002] Oil is generally stored in storage tanks. For safety, energy saving and environmental protection reasons, oil product storage tanks are required to be equipped with oil and gas recovery and nitrogen sealing systems. For large and medium-sized oil reserves, which are generally used as national strategic resources, the facilities are relatively complete during the investment and construction process. However, in some small oil depots, due to limited investment costs, the construction of oil and gas recovery and nitrogen sealing systems is relatively incomplete, or due to high operating costs, the oil and gas recovery and nitrogen sealing systems are in a semi-shutdown state.

[0003] At present, the oil and gas recovery system and nitrogen sealing system of the oil depot are two independent systems. The oil and gas recovery system recovers a small amount of oil. The non-condensable gas is directly discharged after the oil is recovered by the oil and gas recovery system. The nitrogen inhaled and discharged by the nitrogen sealing system during the lifting and lowering of the tank liquid level is discharged after the oil is recovered by the oil and gas recovery system. The two systems operate independently, and the investment and operation costs are relatively high. Summary of the invention

[0004] The technical problem to be solved by the utility model is to provide an oil depot oil gas recovery nitrogen making system, which utilizes the escaped oil gas of the oil gas recovery system to make nitrogen.

[0005] In order to solve the above technical problems, the technical solution adopted by the utility model is:

[0006] An oil depot oil and gas recovery nitrogen production system, comprising a compressor, a gas-liquid separator, an oil and gas cooler, an oil storage tank, a non-condensable gas membrane separator, a non-condensable gas filter, an activated carbon adsorber, a non-condensable gas buffer tank, a pressure swing adsorber and a nitrogen storage tank;

[0007] The inlet end of the compressor is connected to the oil and gas pipeline, the outlet end of the compressor is connected to the gas-liquid separator, the gas phase outlet end of the gas-liquid separator is connected to the oil and gas cooler, and the liquid phase outlet end of the compressor is connected to the main oil outlet pipeline; the gas phase outlet end of the oil and gas cooler is connected to the non-condensable gas membrane separator, and the liquid phase outlet end of the oil and gas cooler is connected to the oil storage tank; the non-condensable gas membrane separator, the non-condensable gas filter, the activated carbon adsorber, the non-condensable gas buffer tank, the pressure swing adsorber and the nitrogen storage tank are connected in sequence through pipelines.

[0008] Furthermore, it includes an oil and gas pipeline flame arrester and an oil and gas pipeline filter which are arranged on the oil and gas pipeline.

[0009] Furthermore, the inlet end of the compressor is also connected to an air inlet pipe, on which an air filter is provided; the gas phase outlet end of the gas-liquid separator is connected to an air dryer through a pipe, and the gas outlet of the air dryer is connected to a non-condensable gas membrane separator through a pipe.

[0010] Furthermore, the nitrogen storage tank is connected to the oil storage tank through a pipeline.

[0011] Furthermore, the oil-gas cooler is connected to a cooling water inlet pipe and a cooling water outlet pipe.

[0012] Furthermore, the oil storage tank is connected to the main oil outlet pipeline via an oil storage tank oil outlet pipeline.

[0013] According to the technical solution provided by the utility model, the non-condensable gas after the oil and gas recovery system recovers the oil is not discharged, the gas enters the pressure swing adsorber to produce nitrogen after being filtered, and the nitrogen returns to the oil storage tank as a nitrogen source for nitrogen sealing, thereby recovering the oil and gas and producing nitrogen.

[0014] The oil and gas recovery nitrogen making system provided by the utility model can meet the requirements of compressed nitrogen making of air and oil and gas systems, and the compressed air and oil and gas systems can be switched for nitrogen making according to needs. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The drawings herein are used to provide further description of the present invention and constitute a part of the present application. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0016] Figure 1 The utility model discloses a process flow chart of an oil and gas recovery and nitrogen making system for an oil depot.

[0017] In the figure, 1-oil and gas pipeline flame arrester, 2-oil and gas pipeline filter, 3-compressor, 4-gas-liquid separator, 5-oil and gas cooler, 6-oil storage tank, 7-non-condensable gas membrane separator, 8-non-condensable gas filter, 9-activated carbon adsorber, 10-non-condensable gas buffer tank, 11-pressure swing adsorber, 12-nitrogen storage tank, 13-air filter, 14-air dryer, 15-oil storage tank. DETAILED DESCRIPTION

[0018] In order to make those skilled in the art better understand the present invention, the present invention is further explained in detail below with reference to the accompanying drawings and embodiments. It should be noted that the features in the embodiments and embodiments of the present application can be combined with each other without conflict.

[0019] A typical embodiment of the utility model provides an oil depot oil gas recovery nitrogen production system, such as Figure 1 As shown, it includes a compressor 3, a gas-liquid separator 4, an oil-gas cooler 5, an oil storage tank 6, a non-condensable gas membrane separator 7, a non-condensable gas filter 8, an activated carbon adsorber 9, a non-condensable gas buffer tank 10, a pressure swing adsorber 11 and a nitrogen storage tank 12.

[0020] The inlet end of the compressor 3 is connected to the oil and gas pipeline G2, the outlet end of the compressor 3 is connected to the gas-liquid separator 4, the gas phase outlet end of the gas-liquid separator 4 is connected to the oil and gas cooler 5, and the liquid phase outlet end of the gas-liquid separator 4 is connected to the main oil outlet pipeline L4; the gas phase outlet end of the oil and gas cooler 5 is connected to the non-condensable gas membrane separator 7, and the liquid phase outlet end of the oil and gas cooler 5 is connected to the oil storage tank 6; the non-condensable gas membrane separator 7, the non-condensable gas filter 8, the activated carbon adsorber 9, the non-condensable gas buffer tank 10, the pressure swing adsorber 11 and the nitrogen storage tank 12 are connected in sequence through pipelines.

[0021] This embodiment provides an oil and gas nitrogen production system. The oil and gas collected from various oil and gas escape points are collected into the oil and gas pipeline G2 through the oil and gas collecting pipeline G1 and compressed to the design pressure by the compressor 3, usually 0.7~1.0MPa. The pressurized gas enters the gas-liquid separator 4 to initially separate the liquid and gas components, and the gas component enters the oil-gas cooler 5 for further cooling and separation. After the oil and gas are cooled by the oil-gas cooler 5, a large amount of liquid oil is separated and sent to the oil storage tank 6. The separated non-condensable gas is sent to the non-condensable gas membrane separator 7 through the non-condensable gas membrane separator pipeline G4 to separate the oil component that has not been completely cooled, and further remove trace oil products. Then, it is transported to the non-condensable gas filter 8 through the non-condensable gas filter pipeline G6 for further filtration, and then enters the activated carbon adsorber 9 to adsorb moisture and other polar substances, and further remove other impurity components. Then, it enters the pressure swing adsorber 11 through the non-condensable gas buffer tank 10, and the required nitrogen is produced through pressure swing adsorption. The nitrogen enters the nitrogen storage tank 12, and the nitrogen is transported to the oil storage tank 15 through the pipeline nitrogen main pipe G7 and the oil storage tank nitrogen pipe G8 as a nitrogen source for nitrogen sealing or for other purposes.

[0022] The activated carbon adsorber 9 and the pressure swing adsorber 11 involved in this solution meet the processing capacity and index requirements of the two media of oil and gas and air.

[0023] The liquid oil separated by the gas-liquid separator 4 and the oil-gas cooler 5 is combined into the main oil outlet pipeline L4 through pipelines for external delivery.

[0024] In a preferred embodiment, the oil and gas nitrogen making system further includes an oil and gas pipeline flame arrester 1 and an oil and gas pipeline filter 2 arranged on the oil and gas pipeline. After the oil and gas are collected, they pass through the pipeline flame arrester 1 and the oil and gas pipeline filter 2 to enter the compressor 3. In order to prevent static electricity or other combustible substances from igniting the medium, the pipeline system is provided with an oil and gas pipeline flame arrester 1. After the oil and gas pass through the oil and gas pipeline flame arrester 1, they are filtered through the oil and gas pipeline filter 2, and the cleaner ones enter the compressor 3 for pressurization.

[0025] This embodiment adds an air nitrogen making system to the oil and gas nitrogen making system. The inlet end of the compressor 3 is also connected to the air pipeline G11, and the air pipeline G11 is provided with an air filter 13; the gas phase outlet end of the gas-liquid separator 4 is connected to the air dryer 14 through a pipeline, and the gas outlet of the air dryer 14 is connected to the non-condensable gas membrane separator 7 through a pipeline.

[0026] This solution uses a single compressor 3 to meet the maximum processing capacity of the back-end nitrogen and oil and gas systems, and to meet the compression of both oil and gas and air.

[0027] When the system is initially operated or the oil and gas collection pipeline is overhauled, the oil storage tank 15 still needs a nitrogen source for nitrogen sealing. At this time, the oil and gas collection pipeline valve can be closed, and the compressor 3 inlet air pipeline can be opened. The air enters the compressor 3 through the air filter 13, and the compressed air enters the water-gas separator 4 to separate part of the water, and then enters the air drying gas 14, and then enters the non-condensable gas membrane separator 7, non-condensable gas filter 8, activated carbon adsorber 9, non-condensable gas buffer tank 10, pressure swing adsorber 11 and nitrogen storage tank 12 shared by the oil and gas nitrogen production system.

[0028] The oil and gas recovery compressor replaces the nitrogen making air compressor to meet the requirements of the back-end nitrogen making system, eliminating the need for air compressors to reduce investment and operating costs; the oil and gas filtration device, non-condensable gas membrane separator, and activated carbon adsorber of the oil and gas recovery system have the same function as the front-end air purification system of the nitrogen making system, which can save equipment investment and maintenance costs; the oil and gas recovery nitrogen making system is a set of systems, which also effectively saves floor space.

[0029] In a preferred embodiment, the nitrogen storage tank 12 is connected to the oil storage tank 15 through a pipeline. The non-condensable gas after the oil and gas recovery system recovers the oil is not discharged, and the gas enters the pressure swing adsorber 11 to produce nitrogen after being filtered. The nitrogen returns to the oil storage tank 15 as a nitrogen source for nitrogen blanketing, thereby recovering the oil and gas and producing nitrogen.

[0030] In a preferred embodiment, the oil-gas cooler 5 is connected to a chilled water inlet pipe and a chilled water outlet pipe. In this embodiment, the oil-gas cooler 5 uses chilled water as a medium for cooling, and the coolant medium is generally chilled water with a relatively low temperature (<18° C.).

[0031] The scope of protection claimed by the present invention is not limited to the above specific implementation methods. For those skilled in the art, the present invention may have various deformations and changes. Any modification, improvement and equivalent substitution made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An oil depot oil gas recovery nitrogen production system, characterized by: It comprises a compressor (3), a gas-liquid separator (4), an oil-gas cooler (5), an oil storage tank (6), a non-condensable gas membrane separator (7), a non-condensable gas filter (8), an activated carbon adsorber (9), a non-condensable gas buffer tank (10), a pressure swing adsorber (11) and a nitrogen storage tank (12); The inlet end of the compressor (3) is connected to an oil and gas pipeline, the outlet end of the compressor (3) is connected to a gas-liquid separator (4), the gas phase outlet end of the gas-liquid separator (4) is connected to an oil and gas cooler (5), and the liquid phase outlet end of the gas-liquid separator (4) is connected to an oil outlet main pipeline; the gas phase outlet end of the oil and gas cooler (5) is connected to a non-condensable gas membrane separator (7), and the liquid phase outlet end of the oil and gas cooler (5) is connected to an oil storage tank (6); the non-condensable gas membrane separator (7), the non-condensable gas filter (8), the activated carbon adsorber (9), the non-condensable gas buffer tank (10), the pressure swing adsorber (11) and the nitrogen storage tank (12) are connected in sequence through pipelines.

2. The oil depot oil gas recovery and nitrogen production system according to claim 1 is characterized in that: It comprises an oil and gas pipeline flame arrester (1) and an oil and gas pipeline filter (2) which are arranged on the oil and gas pipeline.

3. The oil depot oil gas recovery and nitrogen production system according to claim 1 or 2, characterized in that: The inlet end of the compressor (3) is also connected to an air pipeline, on which an air filter (13) is provided; the gas phase outlet end of the gas-liquid separator (4) is connected to an air dryer (14) via a pipeline, and the gas outlet of the air dryer (14) is connected to a non-condensable gas membrane separator (7) via a pipeline.

4. The oil depot oil gas recovery and nitrogen production system according to claim 3 is characterized in that: The nitrogen storage tank (12) is connected to the oil storage tank via a pipeline.

5. The oil depot oil gas recovery and nitrogen production system according to claim 1, 2 or 4, characterized in that: The oil-gas cooler (5) is connected to a chilled water inlet pipe and a chilled water outlet pipe.

6. The oil depot oil gas recovery and nitrogen production system according to claim 5, characterized in that: The oil storage tank (6) is connected to the main oil outlet pipeline via an oil storage tank oil outlet pipeline.

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